├── .github
    └── workflows
    │   ├── ci.yaml
    │   └── release.yaml
├── .gitignore
├── Cargo.lock
├── Cargo.toml
├── LICENSE
├── assets
    ├── bevy_icon.png
    ├── liquid_particle.png
    ├── steel_particle.png
    └── wood_particle.png
├── readme.md
├── renders
    └── water_steel_wood.png
└── src
    ├── camera.rs
    ├── components.rs
    ├── defaults.rs
    ├── expire_old.rs
    ├── grid.rs
    ├── inputs.rs
    ├── main.rs
    ├── particle_sprites.rs
    ├── spawners.rs
    ├── step_g2p.rs
    ├── step_p2g.rs
    ├── step_update_cells.rs
    ├── step_update_deformations.rs
    ├── step_update_grid.rs
    ├── test.rs
    ├── world.rs
    └── zoom.rs


/.github/workflows/ci.yaml:
--------------------------------------------------------------------------------
 1 | name: CI
 2 | 
 3 | on:
 4 |   push:
 5 |     branches: [main]
 6 |   pull_request:
 7 |     branches: [main]
 8 | 
 9 | env:
10 |   CARGO_TERM_COLOR: always
11 | 
12 | jobs:
13 | 
14 |   # Run cargo test
15 |   test:
16 |     name: Test Suite
17 |     runs-on: ubuntu-latest
18 |     steps:
19 |       - name: Checkout sources
20 |         uses: actions/checkout@v2
21 |       - name: Cache
22 |         uses: actions/cache@v2
23 |         with:
24 |           path: |
25 |             ~/.cargo/bin/
26 |             ~/.cargo/registry/index/
27 |             ~/.cargo/registry/cache/
28 |             ~/.cargo/git/db/
29 |             target/
30 |           key: ${{ runner.os }}-cargo-test-${{ hashFiles('**/Cargo.toml') }}
31 |       - name: Install stable toolchain
32 |         uses: actions-rs/toolchain@v1
33 |         with:
34 |           profile: minimal
35 |           toolchain: stable
36 |           override: true
37 |       - name: Install Dependencies
38 |         run: sudo apt-get update; sudo apt-get install pkg-config libx11-dev libasound2-dev libudev-dev libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev
39 |       - name: Run cargo test
40 |         uses: actions-rs/cargo@v1
41 |         with:
42 |           command: test
43 | 
44 |   # Run cargo clippy -- -D warnings
45 |   clippy_check:
46 |     name: Clippy
47 |     runs-on: ubuntu-latest
48 |     steps:
49 |       - name: Checkout sources
50 |         uses: actions/checkout@v2
51 |       - name: Cache
52 |         uses: actions/cache@v2
53 |         with:
54 |           path: |
55 |             ~/.cargo/bin/
56 |             ~/.cargo/registry/index/
57 |             ~/.cargo/registry/cache/
58 |             ~/.cargo/git/db/
59 |             target/
60 |           key: ${{ runner.os }}-cargo-clippy-${{ hashFiles('**/Cargo.toml') }}
61 |       - name: Install stable toolchain
62 |         uses: actions-rs/toolchain@v1
63 |         with:
64 |           toolchain: stable
65 |           profile: minimal
66 |           components: clippy
67 |           override: true
68 |       - name: Install Dependencies
69 |         run: sudo apt-get update; sudo apt-get install pkg-config libx11-dev libasound2-dev libudev-dev
70 |       - name: Run clippy
71 |         uses: actions-rs/clippy-check@v1
72 |         with:
73 |           token: ${{ secrets.GITHUB_TOKEN }}
74 |           args: -- -D warnings
75 | 
76 |   # Run cargo fmt --all -- --check
77 |   format:
78 |     name: Format
79 |     runs-on: ubuntu-latest
80 |     steps:
81 |       - name: Checkout sources
82 |         uses: actions/checkout@v2
83 |       - name: Install stable toolchain
84 |         uses: actions-rs/toolchain@v1
85 |         with:
86 |           toolchain: stable
87 |           profile: minimal
88 |           components: rustfmt
89 |           override: true
90 |       - name: Run cargo fmt
91 |         uses: actions-rs/cargo@v1
92 |         with:
93 |           command: fmt
94 |           args: --all -- --check


--------------------------------------------------------------------------------
/.github/workflows/release.yaml:
--------------------------------------------------------------------------------
  1 | name: Release
  2 | 
  3 | on:
  4 |   push:
  5 |     tags:
  6 |       - '*'
  7 | 
  8 | env:
  9 |   binary: mlsmpm-particles-rs
 10 | 
 11 | jobs:
 12 | 
 13 |   # Build for wasm
 14 |   release-wasm:
 15 |     runs-on: ubuntu-latest
 16 | 
 17 |     steps:
 18 |       - uses: little-core-labs/get-git-tag@v3.0.1
 19 |         id: get_version
 20 |       - uses: actions/checkout@v2
 21 |       - uses: actions-rs/toolchain@v1
 22 |         with:
 23 |           toolchain: stable
 24 |           target: wasm32-unknown-unknown
 25 |           override: true
 26 |       - name: install wasm-bindgen-cli
 27 |         run: |
 28 |           cargo install wasm-bindgen-cli
 29 | 
 30 |       - name: Build
 31 |         run: |
 32 |           cargo build --release --target wasm32-unknown-unknown
 33 | 
 34 |       - name: Prepare package
 35 |         run: |
 36 |           wasm-bindgen --no-typescript --out-name bevy_game --out-dir wasm --target web target/wasm32-unknown-unknown/release/${{ env.binary }}.wasm
 37 |           cp -r assets wasm/
 38 |       - name: Package as a zip
 39 |         uses: vimtor/action-zip@v1
 40 |         with:
 41 |           files: wasm
 42 |           dest: ${{ env.binary }}.zip
 43 | 
 44 |       - name: Upload binaries to release
 45 |         uses: svenstaro/upload-release-action@v2
 46 |         with:
 47 |           repo_token: ${{ secrets.GITHUB_TOKEN }}
 48 |           file: ${{ env.binary }}.zip
 49 |           asset_name: ${{ env.binary }}-wasm-${{ steps.get_version.outputs.tag }}.zip
 50 |           tag: ${{ github.ref }}
 51 |           overwrite: true
 52 | 
 53 |   # Build for Linux
 54 |   release-linux:
 55 |     runs-on: ubuntu-latest
 56 | 
 57 |     steps:
 58 |       - uses: little-core-labs/get-git-tag@v3.0.1
 59 |         id: get_version
 60 |       - uses: actions/checkout@v2
 61 |       - uses: actions-rs/toolchain@v1
 62 |         with:
 63 |           toolchain: stable
 64 |           target: x86_64-unknown-linux-gnu
 65 |           override: true
 66 |       - name: install dependencies
 67 |         run: |
 68 |           sudo apt-get update; sudo apt-get install pkg-config libx11-dev libasound2-dev libudev-dev libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev
 69 | 
 70 |       - name: Build
 71 |         run: |
 72 |           cargo build --release --target x86_64-unknown-linux-gnu
 73 | 
 74 |       - name: Prepare package
 75 |         run: |
 76 |           mkdir linux
 77 |           cp target/x86_64-unknown-linux-gnu/release/${{ env.binary }} linux/
 78 |           cp -r assets linux/
 79 |       - name: Package as a zip
 80 |         uses: vimtor/action-zip@v1
 81 |         with:
 82 |           files: linux
 83 |           dest: ${{ env.binary }}.zip
 84 | 
 85 |       - name: Upload binaries to release
 86 |         uses: svenstaro/upload-release-action@v2
 87 |         with:
 88 |           repo_token: ${{ secrets.GITHUB_TOKEN }}
 89 |           file: ${{ env.binary }}.zip
 90 |           asset_name: ${{ env.binary }}-linux-${{ steps.get_version.outputs.tag }}.zip
 91 |           tag: ${{ github.ref }}
 92 |           overwrite: true
 93 | 
 94 |   # Build for Windows
 95 |   release-windows:
 96 |     runs-on: windows-latest
 97 | 
 98 |     steps:
 99 |       - uses: little-core-labs/get-git-tag@v3.0.1
100 |         id: get_version
101 |       - uses: actions/checkout@v2
102 |       - uses: actions-rs/toolchain@v1
103 |         with:
104 |           toolchain: stable
105 |           target: x86_64-pc-windows-msvc
106 |           override: true
107 | 
108 |       - name: Build
109 |         run: |
110 |           cargo build --release --target x86_64-pc-windows-msvc
111 | 
112 |       - name: Prepare package
113 |         run: |
114 |           mkdir windows
115 |           cp target/x86_64-pc-windows-msvc/release/${{ env.binary }}.exe windows/
116 |           cp -r assets windows/
117 |       - name: Package as a zip
118 |         uses: vimtor/action-zip@v1
119 |         with:
120 |           files: windows
121 |           dest: ${{ env.binary }}.zip
122 | 
123 |       - name: Upload binaries to release
124 |         uses: svenstaro/upload-release-action@v2
125 |         with:
126 |           repo_token: ${{ secrets.GITHUB_TOKEN }}
127 |           file: ${{ env.binary }}.zip
128 |           asset_name: ${{ env.binary }}-windows-${{ steps.get_version.outputs.tag }}.zip
129 |           tag: ${{ github.ref }}
130 |           overwrite: true
131 | 
132 |   # Build for macOS
133 |   release-macos:
134 |     runs-on: macOS-latest
135 | 
136 |     steps:
137 |       - uses: little-core-labs/get-git-tag@v3.0.1
138 |         id: get_version
139 |       - uses: actions/checkout@v2
140 |       - uses: actions-rs/toolchain@v1
141 |         with:
142 |           toolchain: stable
143 |           target: x86_64-apple-darwin
144 |           override: true
145 |       - name: Environment Setup
146 |         run: |
147 |           export CFLAGS="-fno-stack-check"
148 |           export MACOSX_DEPLOYMENT_TARGET="10.9"
149 | 
150 |       - name: Build
151 |         run: |
152 |           cargo build --release --target x86_64-apple-darwin
153 | 
154 |       - name: Prepare Package
155 |         run: |
156 |           mkdir -p ${{ env.binary }}.app/Contents/MacOS
157 |           cp target/x86_64-apple-darwin/release/${{ env.binary }} ${{ env.binary }}.app/Contents/MacOS/
158 |           cp -r assets ${{ env.binary }}.app/Contents/MacOS/
159 |           hdiutil create -fs HFS+ -volname "${{ env.binary }}" -srcfolder ${{ env.binary }}.app ${{ env.binary }}.dmg
160 | 
161 |       - name: Upload binaries to release
162 |         uses: svenstaro/upload-release-action@v2
163 |         with:
164 |           repo_token: ${{ secrets.GITHUB_TOKEN }}
165 |           file: ${{ env.binary }}.dmg
166 |           asset_name: ${{ env.binary }}-macos-${{ steps.get_version.outputs.tag }}.dmg
167 |           tag: ${{ github.ref }}
168 |           overwrite: true


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | /target
2 | 


--------------------------------------------------------------------------------
/Cargo.lock:
--------------------------------------------------------------------------------
   1 | # This file is automatically @generated by Cargo.
   2 | # It is not intended for manual editing.
   3 | version = 3
   4 | 
   5 | [[package]]
   6 | name = "ab_glyph"
   7 | version = "0.2.15"
   8 | source = "registry+https://github.com/rust-lang/crates.io-index"
   9 | checksum = "24606928a235e73cdef55a0c909719cadd72fce573e5713d58cb2952d8f5794c"
  10 | dependencies = [
  11 |  "ab_glyph_rasterizer",
  12 |  "owned_ttf_parser",
  13 | ]
  14 | 
  15 | [[package]]
  16 | name = "ab_glyph_rasterizer"
  17 | version = "0.1.5"
  18 | source = "registry+https://github.com/rust-lang/crates.io-index"
  19 | checksum = "a13739d7177fbd22bb0ed28badfff9f372f8bef46c863db4e1c6248f6b223b6e"
  20 | 
  21 | [[package]]
  22 | name = "adler"
  23 | version = "1.0.2"
  24 | source = "registry+https://github.com/rust-lang/crates.io-index"
  25 | checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
  26 | 
  27 | [[package]]
  28 | name = "adler32"
  29 | version = "1.2.0"
  30 | source = "registry+https://github.com/rust-lang/crates.io-index"
  31 | checksum = "aae1277d39aeec15cb388266ecc24b11c80469deae6067e17a1a7aa9e5c1f234"
  32 | 
  33 | [[package]]
  34 | name = "ahash"
  35 | version = "0.7.6"
  36 | source = "registry+https://github.com/rust-lang/crates.io-index"
  37 | checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
  38 | dependencies = [
  39 |  "getrandom",
  40 |  "once_cell",
  41 |  "version_check",
  42 | ]
  43 | 
  44 | [[package]]
  45 | name = "ahash"
  46 | version = "0.8.0"
  47 | source = "registry+https://github.com/rust-lang/crates.io-index"
  48 | checksum = "57e6e951cfbb2db8de1828d49073a113a29fd7117b1596caa781a258c7e38d72"
  49 | dependencies = [
  50 |  "cfg-if 1.0.0",
  51 |  "getrandom",
  52 |  "once_cell",
  53 |  "version_check",
  54 | ]
  55 | 
  56 | [[package]]
  57 | name = "aho-corasick"
  58 | version = "0.7.18"
  59 | source = "registry+https://github.com/rust-lang/crates.io-index"
  60 | checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
  61 | dependencies = [
  62 |  "memchr",
  63 | ]
  64 | 
  65 | [[package]]
  66 | name = "alsa"
  67 | version = "0.6.0"
  68 | source = "registry+https://github.com/rust-lang/crates.io-index"
  69 | checksum = "5915f52fe2cf65e83924d037b6c5290b7cee097c6b5c8700746e6168a343fd6b"
  70 | dependencies = [
  71 |  "alsa-sys",
  72 |  "bitflags",
  73 |  "libc",
  74 |  "nix 0.23.1",
  75 | ]
  76 | 
  77 | [[package]]
  78 | name = "alsa-sys"
  79 | version = "0.3.1"
  80 | source = "registry+https://github.com/rust-lang/crates.io-index"
  81 | checksum = "db8fee663d06c4e303404ef5f40488a53e062f89ba8bfed81f42325aafad1527"
  82 | dependencies = [
  83 |  "libc",
  84 |  "pkg-config",
  85 | ]
  86 | 
  87 | [[package]]
  88 | name = "android_log-sys"
  89 | version = "0.2.0"
  90 | source = "registry+https://github.com/rust-lang/crates.io-index"
  91 | checksum = "85965b6739a430150bdd138e2374a98af0c3ee0d030b3bb7fc3bddff58d0102e"
  92 | 
  93 | [[package]]
  94 | name = "android_logger"
  95 | version = "0.10.1"
  96 | source = "registry+https://github.com/rust-lang/crates.io-index"
  97 | checksum = "d9ed09b18365ed295d722d0b5ed59c01b79a826ff2d2a8f73d5ecca8e6fb2f66"
  98 | dependencies = [
  99 |  "android_log-sys",
 100 |  "env_logger",
 101 |  "lazy_static",
 102 |  "log",
 103 | ]
 104 | 
 105 | [[package]]
 106 | name = "android_system_properties"
 107 | version = "0.1.5"
 108 | source = "registry+https://github.com/rust-lang/crates.io-index"
 109 | checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
 110 | dependencies = [
 111 |  "libc",
 112 | ]
 113 | 
 114 | [[package]]
 115 | name = "ansi_term"
 116 | version = "0.12.1"
 117 | source = "registry+https://github.com/rust-lang/crates.io-index"
 118 | checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
 119 | dependencies = [
 120 |  "winapi",
 121 | ]
 122 | 
 123 | [[package]]
 124 | name = "anyhow"
 125 | version = "1.0.56"
 126 | source = "registry+https://github.com/rust-lang/crates.io-index"
 127 | checksum = "4361135be9122e0870de935d7c439aef945b9f9ddd4199a553b5270b49c82a27"
 128 | 
 129 | [[package]]
 130 | name = "approx"
 131 | version = "0.5.1"
 132 | source = "registry+https://github.com/rust-lang/crates.io-index"
 133 | checksum = "cab112f0a86d568ea0e627cc1d6be74a1e9cd55214684db5561995f6dad897c6"
 134 | dependencies = [
 135 |  "num-traits",
 136 | ]
 137 | 
 138 | [[package]]
 139 | name = "arboard"
 140 | version = "2.1.1"
 141 | source = "registry+https://github.com/rust-lang/crates.io-index"
 142 | checksum = "dc120354d1b5ec6d7aaf4876b602def75595937b5e15d356eb554ab5177e08bb"
 143 | dependencies = [
 144 |  "clipboard-win",
 145 |  "core-graphics 0.22.3",
 146 |  "image 0.23.14",
 147 |  "log",
 148 |  "objc",
 149 |  "objc-foundation",
 150 |  "objc_id",
 151 |  "parking_lot 0.12.1",
 152 |  "thiserror",
 153 |  "winapi",
 154 |  "x11rb",
 155 | ]
 156 | 
 157 | [[package]]
 158 | name = "arrayvec"
 159 | version = "0.7.2"
 160 | source = "registry+https://github.com/rust-lang/crates.io-index"
 161 | checksum = "8da52d66c7071e2e3fa2a1e5c6d088fec47b593032b254f5e980de8ea54454d6"
 162 | 
 163 | [[package]]
 164 | name = "ash"
 165 | version = "0.37.0+1.3.209"
 166 | source = "registry+https://github.com/rust-lang/crates.io-index"
 167 | checksum = "006ca68e0f2b03f22d6fa9f2860f85aed430d257fec20f8879b2145e7c7ae1a6"
 168 | dependencies = [
 169 |  "libloading",
 170 | ]
 171 | 
 172 | [[package]]
 173 | name = "async-channel"
 174 | version = "1.6.1"
 175 | source = "registry+https://github.com/rust-lang/crates.io-index"
 176 | checksum = "2114d64672151c0c5eaa5e131ec84a74f06e1e559830dabba01ca30605d66319"
 177 | dependencies = [
 178 |  "concurrent-queue",
 179 |  "event-listener",
 180 |  "futures-core",
 181 | ]
 182 | 
 183 | [[package]]
 184 | name = "async-executor"
 185 | version = "1.4.1"
 186 | source = "registry+https://github.com/rust-lang/crates.io-index"
 187 | checksum = "871f9bb5e0a22eeb7e8cf16641feb87c9dc67032ccf8ff49e772eb9941d3a965"
 188 | dependencies = [
 189 |  "async-task",
 190 |  "concurrent-queue",
 191 |  "fastrand",
 192 |  "futures-lite",
 193 |  "once_cell",
 194 |  "slab",
 195 | ]
 196 | 
 197 | [[package]]
 198 | name = "async-task"
 199 | version = "4.2.0"
 200 | source = "registry+https://github.com/rust-lang/crates.io-index"
 201 | checksum = "30696a84d817107fc028e049980e09d5e140e8da8f1caeb17e8e950658a3cea9"
 202 | 
 203 | [[package]]
 204 | name = "atomic_refcell"
 205 | version = "0.1.8"
 206 | source = "registry+https://github.com/rust-lang/crates.io-index"
 207 | checksum = "73b5e5f48b927f04e952dedc932f31995a65a0bf65ec971c74436e51bf6e970d"
 208 | 
 209 | [[package]]
 210 | name = "autocfg"
 211 | version = "1.1.0"
 212 | source = "registry+https://github.com/rust-lang/crates.io-index"
 213 | checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 214 | 
 215 | [[package]]
 216 | name = "base64"
 217 | version = "0.13.0"
 218 | source = "registry+https://github.com/rust-lang/crates.io-index"
 219 | checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
 220 | 
 221 | [[package]]
 222 | name = "bevy"
 223 | version = "0.8.1"
 224 | source = "registry+https://github.com/rust-lang/crates.io-index"
 225 | checksum = "fea147ef1ebb92d41294cfad804c40de151b174c711ce6e0a4a40eba23eae1a4"
 226 | dependencies = [
 227 |  "bevy_internal",
 228 | ]
 229 | 
 230 | [[package]]
 231 | name = "bevy_animation"
 232 | version = "0.8.1"
 233 | source = "registry+https://github.com/rust-lang/crates.io-index"
 234 | checksum = "a4365465fca7bd78295eb81d0a04afc049399852793d562eb017849bb5d6c55e"
 235 | dependencies = [
 236 |  "bevy_app",
 237 |  "bevy_asset",
 238 |  "bevy_core",
 239 |  "bevy_ecs",
 240 |  "bevy_hierarchy",
 241 |  "bevy_math",
 242 |  "bevy_reflect",
 243 |  "bevy_time",
 244 |  "bevy_transform",
 245 |  "bevy_utils",
 246 | ]
 247 | 
 248 | [[package]]
 249 | name = "bevy_app"
 250 | version = "0.8.1"
 251 | source = "registry+https://github.com/rust-lang/crates.io-index"
 252 | checksum = "9e4ae0a6ed2adf3b153511b4645241660a93f747c05ecd1e5a909dafc803cad4"
 253 | dependencies = [
 254 |  "bevy_derive",
 255 |  "bevy_ecs",
 256 |  "bevy_reflect",
 257 |  "bevy_tasks",
 258 |  "bevy_utils",
 259 |  "wasm-bindgen",
 260 |  "web-sys",
 261 | ]
 262 | 
 263 | [[package]]
 264 | name = "bevy_asset"
 265 | version = "0.8.1"
 266 | source = "registry+https://github.com/rust-lang/crates.io-index"
 267 | checksum = "2ec773c861a7e9d9978771f59f385500ec6da3a1ab5487705cddb054393d3d19"
 268 | dependencies = [
 269 |  "anyhow",
 270 |  "bevy_app",
 271 |  "bevy_diagnostic",
 272 |  "bevy_ecs",
 273 |  "bevy_log",
 274 |  "bevy_reflect",
 275 |  "bevy_tasks",
 276 |  "bevy_utils",
 277 |  "crossbeam-channel",
 278 |  "downcast-rs",
 279 |  "fastrand",
 280 |  "js-sys",
 281 |  "ndk-glue 0.5.1",
 282 |  "notify",
 283 |  "parking_lot 0.12.1",
 284 |  "serde",
 285 |  "thiserror",
 286 |  "wasm-bindgen",
 287 |  "wasm-bindgen-futures",
 288 |  "web-sys",
 289 | ]
 290 | 
 291 | [[package]]
 292 | name = "bevy_audio"
 293 | version = "0.8.1"
 294 | source = "registry+https://github.com/rust-lang/crates.io-index"
 295 | checksum = "1e5cf4713a24f318841f73a9e030854cfd5bad46bc81fa1acc9590cdab053c6f"
 296 | dependencies = [
 297 |  "anyhow",
 298 |  "bevy_app",
 299 |  "bevy_asset",
 300 |  "bevy_ecs",
 301 |  "bevy_reflect",
 302 |  "bevy_utils",
 303 |  "parking_lot 0.12.1",
 304 |  "rodio",
 305 | ]
 306 | 
 307 | [[package]]
 308 | name = "bevy_core"
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3528 | checksum = "180e6ccf01daf4c426b846dfc66db1fc518f074baa793aa7d9b9aaeffad6a3b6"
3529 | 
3530 | [[package]]
3531 | name = "windows_i686_msvc"
3532 | version = "0.36.1"
3533 | source = "registry+https://github.com/rust-lang/crates.io-index"
3534 | checksum = "e2e7917148b2812d1eeafaeb22a97e4813dfa60a3f8f78ebe204bcc88f12f024"
3535 | 
3536 | [[package]]
3537 | name = "windows_x86_64_gnu"
3538 | version = "0.36.1"
3539 | source = "registry+https://github.com/rust-lang/crates.io-index"
3540 | checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
3541 | 
3542 | [[package]]
3543 | name = "windows_x86_64_msvc"
3544 | version = "0.36.1"
3545 | source = "registry+https://github.com/rust-lang/crates.io-index"
3546 | checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"
3547 | 
3548 | [[package]]
3549 | name = "winit"
3550 | version = "0.26.1"
3551 | source = "registry+https://github.com/rust-lang/crates.io-index"
3552 | checksum = "9b43cc931d58b99461188607efd7acb2a093e65fc621f54cad78517a6063e73a"
3553 | dependencies = [
3554 |  "bitflags",
3555 |  "cocoa",
3556 |  "core-foundation 0.9.3",
3557 |  "core-graphics 0.22.3",
3558 |  "core-video-sys",
3559 |  "dispatch",
3560 |  "instant",
3561 |  "lazy_static",
3562 |  "libc",
3563 |  "log",
3564 |  "mio",
3565 |  "ndk 0.5.0",
3566 |  "ndk-glue 0.5.1",
3567 |  "ndk-sys 0.2.2",
3568 |  "objc",
3569 |  "parking_lot 0.11.2",
3570 |  "percent-encoding",
3571 |  "raw-window-handle",
3572 |  "wasm-bindgen",
3573 |  "web-sys",
3574 |  "winapi",
3575 |  "x11-dl",
3576 | ]
3577 | 
3578 | [[package]]
3579 | name = "x11-dl"
3580 | version = "2.19.1"
3581 | source = "registry+https://github.com/rust-lang/crates.io-index"
3582 | checksum = "ea26926b4ce81a6f5d9d0f3a0bc401e5a37c6ae14a1bfaa8ff6099ca80038c59"
3583 | dependencies = [
3584 |  "lazy_static",
3585 |  "libc",
3586 |  "pkg-config",
3587 | ]
3588 | 
3589 | [[package]]
3590 | name = "x11rb"
3591 | version = "0.9.0"
3592 | source = "registry+https://github.com/rust-lang/crates.io-index"
3593 | checksum = "6e99be55648b3ae2a52342f9a870c0e138709a3493261ce9b469afe6e4df6d8a"
3594 | dependencies = [
3595 |  "gethostname",
3596 |  "nix 0.22.3",
3597 |  "winapi",
3598 |  "winapi-wsapoll",
3599 | ]
3600 | 
3601 | [[package]]
3602 | name = "xi-unicode"
3603 | version = "0.3.0"
3604 | source = "registry+https://github.com/rust-lang/crates.io-index"
3605 | checksum = "a67300977d3dc3f8034dae89778f502b6ba20b269527b3223ba59c0cf393bb8a"
3606 | 


--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "mlsmpm-particles-rs"
 3 | version = "0.1.1"
 4 | edition = "2021"
 5 | 
 6 | [dependencies]
 7 | bevy = {version = "0.8"}
 8 | bevy_egui = "0.16"
 9 | rand = "0.8"
10 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | Copyright (c) 2022 github.com/robkau
 2 | 
 3 | Permission is hereby granted, free of charge, to any person obtaining
 4 | a copy of this software and associated documentation files (the
 5 | "Software"), to deal in the Software without restriction, including
 6 | without limitation the rights to use, copy, modify, merge, publish,
 7 | distribute, sublicense, and/or sell copies of the Software, and to
 8 | permit persons to whom the Software is furnished to do so, subject to
 9 | the following conditions:
10 | 
11 | The above copyright notice and this permission notice shall be
12 | included in all copies or substantial portions of the Software.
13 | 
14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
15 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
17 | NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
18 | LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
19 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
20 | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


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/assets/bevy_icon.png:
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https://raw.githubusercontent.com/robkau/mlsmpm-particles-rs/2cac04f6d022ea1c0e805da683f0383d1028f573/assets/bevy_icon.png


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/assets/liquid_particle.png:
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https://raw.githubusercontent.com/robkau/mlsmpm-particles-rs/2cac04f6d022ea1c0e805da683f0383d1028f573/assets/liquid_particle.png


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/assets/steel_particle.png:
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https://raw.githubusercontent.com/robkau/mlsmpm-particles-rs/2cac04f6d022ea1c0e805da683f0383d1028f573/assets/steel_particle.png


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/assets/wood_particle.png:
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https://raw.githubusercontent.com/robkau/mlsmpm-particles-rs/2cac04f6d022ea1c0e805da683f0383d1028f573/assets/wood_particle.png


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/readme.md:
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 1 | # mlsmpm-particles-rs
 2 | 
 3 | This is a 2D multi-phase Material Point Method simulation using Rust.  
 4 | Currently two types of particles are supported:
 5 | - Neo-Hookean Hyperelastic solid
 6 | - Newtonian fluid
 7 | 
 8 | The simulation uses MLS-MPM algorithm (Moving Least Squares Material Point Method).
 9 | My matching implementation in Go is [mlsmpm-particles-go](https://github.com/robkau/mlsmpm-particles-go).
10 | Both repositories were implemented by following [nialltl's article on MLS-MPM](https://nialltl.neocities.org/articles/mpm_guide.html) and [matching example code](https://github.com/nialltl/incremental_mpm).
11 | 
12 | Library [bevy](https://github.com/bevyengine/bevy) is used to render the output to a window and provide an Entity Component System with parallel processing.  
13 | Liby99's [mpm-rs](https://github.com/Liby99/mpm-rs) project inspired me to model MPM simulation inside an ECS.  
14 | Unlike mlsmpm-particles-go, this implementation in rust is parallelized and can fully utilize all CPU cores when enough particles are spawned.    
15 | The Bevy ECS is really ergonomic, all it took to implement parallel processing was calling the par_for_each methods and the rest happened automatically... after I made the Rust compiler happy.
16 | 
17 | ---
18 | 
19 | ## Examples
20 | 
21 | ![Water, steel, and wood particles](renders/water_steel_wood.png?raw=true "water, steel, and wood particles")
22 | 
23 | 
24 | 
25 | https://user-images.githubusercontent.com/1654124/151740533-e908bdd6-f43f-4830-99d6-70cb36411876.mov
26 | 
27 | 
28 | 
29 | https://user-images.githubusercontent.com/1654124/151740548-16d7f071-e29f-4599-b88a-b2bb985dd70e.mov
30 | 
31 | 
32 | 
33 | https://user-images.githubusercontent.com/1654124/151740555-748fbb31-cb76-4819-94e2-58a2325c6276.mov
34 | 


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/renders/water_steel_wood.png:
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https://raw.githubusercontent.com/robkau/mlsmpm-particles-rs/2cac04f6d022ea1c0e805da683f0383d1028f573/renders/water_steel_wood.png


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/src/camera.rs:
--------------------------------------------------------------------------------
 1 | use bevy::math::{Vec2, Vec3};
 2 | use bevy::prelude::{Camera2dBundle, Commands, Res, Transform, Windows};
 3 | 
 4 | use crate::grid::Grid;
 5 | 
 6 | pub(super) fn setup_camera(mut commands: Commands, grid: Res<Grid>, wnds: Res<Windows>) {
 7 |     let mut cb = Camera2dBundle::default();
 8 | 
 9 |     let wnd = wnds.get_primary().unwrap();
10 |     let size = Vec2::new(wnd.width() as f32, wnd.height() as f32);
11 | 
12 |     let scale = f32::min(size.x, size.y) / grid.width as f32; // todo in response to events.
13 | 
14 |     cb.transform = Transform::from_translation(Vec3::new(
15 |         size.x / (scale * 2.0),
16 |         size.y / (scale * 2.0),
17 |         0.0,
18 |     ));
19 |     cb.projection.scale = 1.0 / scale;
20 |     commands.spawn_bundle(cb);
21 | }
22 | 


--------------------------------------------------------------------------------
/src/components.rs:
--------------------------------------------------------------------------------
  1 | use bevy::math::{Mat2, Vec2};
  2 | use bevy::prelude::*;
  3 | 
  4 | // Tags particle entities
  5 | #[derive(Component)]
  6 | pub(super) struct ParticleTag;
  7 | 
  8 | // todo move rendering to GPU shader. over 70% of traced CPU time is inside sprite stuff.
  9 | 
 10 | // XY position
 11 | #[derive(Component, Debug)]
 12 | pub(super) struct Position(pub(super) Vec2);
 13 | 
 14 | // XY velocity
 15 | #[derive(Component, Debug)]
 16 | pub(super) struct Velocity(pub(super) Vec2);
 17 | 
 18 | // mass
 19 | #[derive(Component)]
 20 | pub(super) struct Mass(pub(super) f32);
 21 | 
 22 | // 2x2 affine momentum matrix
 23 | #[derive(Component)]
 24 | pub(super) struct AffineMomentum(pub(super) Mat2);
 25 | 
 26 | // fluid constitutive model properties
 27 | #[derive(Clone, Copy, Component)]
 28 | pub(super) struct NewtonianFluidModel {
 29 |     pub(super) rest_density: f32,
 30 |     pub(super) dynamic_viscosity: f32,
 31 |     pub(super) eos_stiffness: f32,
 32 |     pub(super) eos_power: f32,
 33 | }
 34 | 
 35 | impl ConstitutiveModel for NewtonianFluidModel {
 36 |     fn new_particle(
 37 |         self,
 38 |         commands: &mut Commands,
 39 |         texture: Handle<Image>,
 40 |         at: Vec2,
 41 |         mass: f32,
 42 |         created_at: usize,
 43 |         vel: Option<Vec2>,
 44 |         max_age: Option<usize>,
 45 |     ) {
 46 |         commands
 47 |             .spawn_bundle(SpriteBundle {
 48 |                 texture,
 49 |                 transform: Transform::from_scale(Vec3::splat(0.002)),
 50 |                 ..Default::default()
 51 |             })
 52 |             .insert_bundle((
 53 |                 Position(at),
 54 |                 self,
 55 |                 Mass(mass),
 56 |                 Velocity(vel.unwrap_or(Vec2::ZERO)),
 57 |                 MaxAge(max_age.unwrap_or(5000)),
 58 |                 AffineMomentum(Mat2::ZERO),
 59 |                 CreatedAt(created_at),
 60 |                 CellMassMomentumContributions([GridMassAndMomentumChange(0, 0., Vec2::ZERO); 9]),
 61 |                 ParticleTag,
 62 |             ));
 63 |     }
 64 | }
 65 | 
 66 | // solid constitutive model properties
 67 | #[derive(Clone, Copy, Component)]
 68 | pub(super) struct NeoHookeanHyperElasticModel {
 69 |     pub(super) deformation_gradient: Mat2,
 70 |     pub(super) elastic_lambda: f32,
 71 |     // youngs modulus
 72 |     pub(super) elastic_mu: f32, // shear modulus
 73 | }
 74 | 
 75 | impl ConstitutiveModel for NeoHookeanHyperElasticModel {
 76 |     fn new_particle(
 77 |         self,
 78 |         commands: &mut Commands,
 79 |         texture: Handle<Image>,
 80 |         at: Vec2,
 81 |         mass: f32,
 82 |         created_at: usize,
 83 |         vel: Option<Vec2>,
 84 |         max_age: Option<usize>,
 85 |     ) {
 86 |         commands
 87 |             .spawn_bundle(SpriteBundle {
 88 |                 texture,
 89 |                 transform: Transform::from_scale(Vec3::splat(0.005)),
 90 |                 ..Default::default()
 91 |             })
 92 |             .insert_bundle((
 93 |                 Position(at),
 94 |                 self,
 95 |                 Mass(mass),
 96 |                 Velocity(vel.unwrap_or(Vec2::ZERO)),
 97 |                 MaxAge(max_age.unwrap_or(5000)),
 98 |                 AffineMomentum(Mat2::ZERO),
 99 |                 CreatedAt(created_at),
100 |                 CellMassMomentumContributions([GridMassAndMomentumChange(0, 0., Vec2::ZERO); 9]),
101 |                 ParticleTag,
102 |             ));
103 |     }
104 | }
105 | 
106 | pub(super) fn steel_properties() -> NeoHookeanHyperElasticModel {
107 |     NeoHookeanHyperElasticModel {
108 |         deformation_gradient: Default::default(),
109 |         elastic_lambda: 180. * 1000.,
110 |         elastic_mu: 78. * 1000.,
111 |     }
112 | }
113 | 
114 | pub(super) fn water_properties() -> NewtonianFluidModel {
115 |     NewtonianFluidModel {
116 |         rest_density: 4.,
117 |         dynamic_viscosity: 0.1,
118 |         eos_stiffness: 100.,
119 |         eos_power: 4.,
120 |     }
121 | }
122 | 
123 | // computed changes to-be-applied to grid on next steps
124 | #[derive(Component)]
125 | pub(super) struct CellMassMomentumContributions(pub(super) [GridMassAndMomentumChange; 9]);
126 | 
127 | #[derive(Clone, Copy)]
128 | pub(super) struct GridMassAndMomentumChange(pub(super) usize, pub(super) f32, pub(super) Vec2);
129 | 
130 | // tick the entity was created on
131 | #[derive(Component)]
132 | pub(super) struct CreatedAt(pub(super) usize);
133 | 
134 | // entity deleted after this many ticks
135 | #[derive(Component)]
136 | pub(super) struct MaxAge(pub(super) usize);
137 | 
138 | pub trait ConstitutiveModel {
139 |     fn new_particle(
140 |         self,
141 |         commands: &mut Commands,
142 |         texture: Handle<Image>,
143 |         at: Vec2,
144 |         mass: f32,
145 |         created_at: usize,
146 |         vel: Option<Vec2>,
147 |         max_age: Option<usize>,
148 |     );
149 | }
150 | 


--------------------------------------------------------------------------------
/src/defaults.rs:
--------------------------------------------------------------------------------
 1 | //pub(super) const DEFAULT_WINDOW_WIDTH: f32 = 1000.;
 2 | //pub(super) const DEFAULT_WINDOW_HEIGHT: f32 = 1000.;
 3 | // todo proper scaling.
 4 | 
 5 | pub(super) const DEFAULT_GRID_WIDTH: usize = usize::pow(2, 8);
 6 | 
 7 | // todo use me when spawning...? maybe variable for density.
 8 | // pub(super) const PARTICLES_ACROSS_GRID: usize = 1024;
 9 | // pub(super) const PARTICLES_ACROSS_CELL: usize = PARTICLES_ACROSS_GRID / DEFAULT_GRID_WIDTH;
10 | 
11 | pub(super) const DEFAULT_DT: f32 = 0.002;
12 | pub(super) const DEFAULT_GRAVITY: f32 = -9.8;
13 | 
14 | pub(super) const PAR_BATCH_SIZE: usize = usize::pow(2, 12);
15 | 


--------------------------------------------------------------------------------
/src/expire_old.rs:
--------------------------------------------------------------------------------
 1 | use bevy::prelude::*;
 2 | 
 3 | use crate::components::*;
 4 | use crate::world::*;
 5 | 
 6 | pub(super) fn delete_old_entities(
 7 |     mut commands: Commands,
 8 |     world: Res<WorldState>,
 9 |     aged_entities: Query<(Entity, &CreatedAt, &MaxAge)>,
10 | ) {
11 |     aged_entities.for_each(|(id, created_at, max_age)| {
12 |         if world.current_tick > created_at.0 + max_age.0 {
13 |             commands.entity(id).despawn();
14 |         }
15 |     });
16 | }
17 | 


--------------------------------------------------------------------------------
/src/grid.rs:
--------------------------------------------------------------------------------
  1 | use bevy::math::{Mat2, Vec2};
  2 | use bevy::prelude::ResMut;
  3 | 
  4 | #[derive(Debug, Clone, Copy)]
  5 | pub(super) struct Cell {
  6 |     pub(super) velocity: Vec2,
  7 |     pub(super) mass: f32,
  8 | }
  9 | 
 10 | // MPM grid resource
 11 | #[derive(Clone)]
 12 | pub(super) struct Grid {
 13 |     pub(super) cells: Vec<Cell>,
 14 |     pub(super) width: usize,
 15 | }
 16 | 
 17 | impl Grid {
 18 |     pub(super) fn new(width: usize) -> Grid {
 19 |         Grid {
 20 |             cells: vec![
 21 |                 Cell {
 22 |                     velocity: Vec2::ZERO,
 23 |                     mass: 0.0,
 24 |                 };
 25 |                 width * width
 26 |             ],
 27 |             width,
 28 |         }
 29 |     }
 30 | 
 31 |     pub(super) fn index_at(&self, x: usize, y: usize) -> usize {
 32 |         x * self.width + y
 33 |     }
 34 | 
 35 |     pub(super) fn reset(&mut self) {
 36 |         for mut cell in self.cells.iter_mut() {
 37 |             cell.velocity = Vec2::ZERO;
 38 |             cell.mass = 0.0;
 39 |         }
 40 |     }
 41 | 
 42 |     pub(super) fn update(&mut self, dt: f32, gravity: f32) {
 43 |         for (i, cell) in self.cells.iter_mut().enumerate() {
 44 |             if cell.mass > 0.0 {
 45 |                 // convert momentum to velocity, apply gravity
 46 |                 cell.velocity *= 1.0 / cell.mass;
 47 |                 cell.velocity.y += dt * gravity;
 48 | 
 49 |                 // boundary conditions
 50 |                 let x = i / self.width;
 51 |                 let y = i % self.width;
 52 |                 if x < 2 {
 53 |                     // can only stay in place or go right
 54 |                     if cell.velocity.x < 0.0 {
 55 |                         cell.velocity.x = 0.0;
 56 |                     }
 57 |                 }
 58 |                 if x > self.width - 3 {
 59 |                     // can only stay in place or go left
 60 |                     if cell.velocity.x > 0.0 {
 61 |                         cell.velocity.x = 0.0;
 62 |                     }
 63 |                 }
 64 |                 if y < 2 {
 65 |                     // can only stay in place or go up
 66 |                     if cell.velocity.y < 0.0 {
 67 |                         cell.velocity.y = 0.0;
 68 |                     }
 69 |                 }
 70 |                 if y > self.width - 3 {
 71 |                     // can only stay in place or go down
 72 |                     if cell.velocity.y > 0.0 {
 73 |                         cell.velocity.y = 0.0;
 74 |                     }
 75 |                 }
 76 |             }
 77 |         }
 78 |     }
 79 | }
 80 | 
 81 | pub(super) fn reset_grid(mut grid: ResMut<Grid>) {
 82 |     grid.reset();
 83 | }
 84 | 
 85 | pub(super) fn quadratic_interpolation_weights(cell_diff: Vec2) -> [Vec2; 3] {
 86 |     [
 87 |         Vec2::new(
 88 |             0.5 * f32::powi(0.5 - cell_diff.x, 2),
 89 |             0.5 * f32::powi(0.5 - cell_diff.y, 2),
 90 |         ),
 91 |         Vec2::new(
 92 |             0.75 - f32::powi(cell_diff.x, 2),
 93 |             0.75 - f32::powi(cell_diff.y, 2),
 94 |         ),
 95 |         Vec2::new(
 96 |             0.5 * f32::powi(0.5 + cell_diff.x, 2),
 97 |             0.5 * f32::powi(0.5 + cell_diff.y, 2),
 98 |         ),
 99 |     ]
100 | }
101 | 
102 | pub(super) fn weighted_velocity_and_cell_dist_to_term(
103 |     weighted_velocity: Vec2,
104 |     cell_dist: Vec2,
105 | ) -> Mat2 {
106 |     Mat2::from_cols(
107 |         Vec2::new(
108 |             weighted_velocity[0] * cell_dist[0],
109 |             weighted_velocity[1] * cell_dist[0],
110 |         ),
111 |         Vec2::new(
112 |             weighted_velocity[0] * cell_dist[1],
113 |             weighted_velocity[1] * cell_dist[1],
114 |         ),
115 |     )
116 | }
117 | 


--------------------------------------------------------------------------------
/src/inputs.rs:
--------------------------------------------------------------------------------
  1 | use bevy::math::Vec2;
  2 | use bevy::prelude::{
  3 |     AssetServer, Commands, Entity, Input, KeyCode, Local, MouseButton, Query, Res, ResMut, Windows,
  4 |     With,
  5 | };
  6 | use bevy_egui::{egui, EguiContext, EguiSettings};
  7 | 
  8 | use crate::{grid, spawn_particles, ParticleSpawnerInfo, SpawnerPattern};
  9 | 
 10 | use super::components::*;
 11 | use super::defaults::*;
 12 | use super::world::*;
 13 | 
 14 | #[derive(Default)]
 15 | pub(super) struct ClickAndDragState {
 16 |     dragging: bool,
 17 |     source_pos: Vec2,
 18 | }
 19 | 
 20 | pub(super) fn handle_inputs(
 21 |     mut commands: Commands,
 22 |     windows: Res<Windows>,
 23 |     asset_server: Res<AssetServer>,
 24 |     btn: Res<Input<MouseButton>>,
 25 |     keys: Res<Input<KeyCode>>,
 26 |     mut egui_context: ResMut<EguiContext>,
 27 |     mut egui_settings: ResMut<EguiSettings>,
 28 |     mut toggle_scale_factor: Local<Option<bool>>,
 29 |     mut world: ResMut<WorldState>,
 30 |     mut spawner_drag: Local<ClickAndDragState>,
 31 |     mut particles: Query<(Entity, &Position, &mut Velocity, &Mass), With<ParticleTag>>,
 32 |     // todo also reset all known spawners to the current set spawn patern.
 33 |     grid: Res<grid::Grid>,
 34 | ) {
 35 |     let window = windows.get_primary().unwrap();
 36 |     if let Some(win_pos) = window.cursor_position() {
 37 |         // cursor is inside the window.
 38 |         // translate window position to grid position
 39 |         let size = Vec2::new(window.width() as f32, window.height() as f32);
 40 |         let scale = f32::min(size.x, size.y) / grid.width as f32;
 41 |         let grid_pos = win_pos / scale;
 42 | 
 43 |         // if particle is near cursor, push it away.
 44 |         particles.par_for_each_mut(PAR_BATCH_SIZE, |(_, position, mut velocity, _)| {
 45 |             let dist = Vec2::new(position.0.x - grid_pos.x, position.0.y - grid_pos.y);
 46 | 
 47 |             let mouse_radius = 6.;
 48 | 
 49 |             if dist.dot(dist) < mouse_radius * mouse_radius {
 50 |                 let norm_factor = dist.length() / mouse_radius;
 51 |                 let force = dist.normalize() * (norm_factor / 2.);
 52 |                 velocity.0 += force;
 53 |             }
 54 |         });
 55 | 
 56 |         // can left click and drag to spawn new solid steel arrowhead with velocity.
 57 |         if btn.just_pressed(MouseButton::Left) && !spawner_drag.dragging {
 58 |             // start dragging
 59 |             spawner_drag.dragging = true;
 60 |             spawner_drag.source_pos = grid_pos;
 61 |         } else if btn.just_released(MouseButton::Left) && spawner_drag.dragging {
 62 |             // end dragging
 63 |             spawner_drag.dragging = false;
 64 | 
 65 |             // and spawn some particles with velocity based on drag distance
 66 |             let si = &ParticleSpawnerInfo {
 67 |                 created_at: world.current_tick,
 68 |                 pattern: SpawnerPattern::Triangle,
 69 |                 spawn_frequency: 999999999, // todo special value to spawn once only.
 70 |                 max_particles: 500000,
 71 |                 particle_duration: 20000,
 72 |                 particle_origin: spawner_drag.source_pos,
 73 |                 particle_velocity: grid_pos - spawner_drag.source_pos,
 74 |                 particle_velocity_random_vec_a: Default::default(),
 75 |                 particle_velocity_random_vec_b: Default::default(),
 76 |                 particle_mass: 1.0,
 77 |             };
 78 | 
 79 |             spawn_particles(
 80 |                 si,
 81 |                 steel_properties(),
 82 |                 &mut commands,
 83 |                 asset_server.load("steel_particle.png"),
 84 |                 &world,
 85 |                 &grid,
 86 |             );
 87 |         }
 88 | 
 89 |         // can right click to dump a bucket of water.
 90 |         if btn.just_pressed(MouseButton::Right) {
 91 |             let si = &ParticleSpawnerInfo {
 92 |                 created_at: world.current_tick,
 93 |                 pattern: SpawnerPattern::Cube,
 94 |                 spawn_frequency: 999999999, // todo special value to spawn once only.
 95 |                 max_particles: 500000,
 96 |                 particle_duration: 20000,
 97 |                 particle_origin: grid_pos,
 98 |                 particle_velocity: Vec2::new(0., -40.),
 99 |                 particle_velocity_random_vec_a: Default::default(),
100 |                 particle_velocity_random_vec_b: Default::default(),
101 |                 particle_mass: 0.75,
102 |             };
103 | 
104 |             // todo value to set size/width of spawned objects
105 |             spawn_particles(
106 |                 si,
107 |                 water_properties(),
108 |                 &mut commands,
109 |                 asset_server.load("liquid_particle.png"),
110 |                 &world,
111 |                 &grid,
112 |             );
113 |         }
114 | 
115 |         egui::Window::new("Controls").show(egui_context.ctx_mut(), |ui| {
116 |             if ui.button("(R)eset").clicked() || keys.just_pressed(KeyCode::R) {
117 |                 particles.for_each(|(id, _, _, _)| {
118 |                     commands.entity(id).despawn();
119 |                 });
120 |                 world.dt = DEFAULT_DT;
121 |                 world.gravity = DEFAULT_GRAVITY;
122 |                 return;
123 |             };
124 |             if ui.button("(G)ravity toggle").clicked() || keys.just_pressed(KeyCode::G) {
125 |                 world.toggle_gravity();
126 |                 return;
127 |             };
128 | 
129 |             // slider for gravity
130 |             ui.add(egui::Slider::new(&mut world.gravity, -10.0..=10.).text("gravity"));
131 | 
132 |             // slider for DT.
133 |             ui.add(egui::Slider::new(&mut world.dt, 0.0001..=0.01).text("dt"));
134 | 
135 |             // toggle hiDPI with '/'
136 |             if keys.just_pressed(KeyCode::Slash) || toggle_scale_factor.is_none() {
137 |                 *toggle_scale_factor = Some(!toggle_scale_factor.unwrap_or(true));
138 | 
139 |                 if let Some(window) = windows.get_primary() {
140 |                     let scale_factor = if toggle_scale_factor.unwrap() {
141 |                         1.0 / window.scale_factor()
142 |                     } else {
143 |                         1.0
144 |                     };
145 |                     egui_settings.scale_factor = scale_factor;
146 |                 }
147 |             }
148 | 
149 |             // todo:
150 |             // one spawner can be selected (or new spawner to-create can be selected)
151 |             // click and drag when placing to set particle velocity
152 |             // the selected spawner shows its elements on left
153 |         });
154 |     };
155 | }
156 | 


--------------------------------------------------------------------------------
/src/main.rs:
--------------------------------------------------------------------------------
  1 | #![allow(clippy::too_many_arguments)]
  2 | 
  3 | use bevy::diagnostic::{
  4 |     EntityCountDiagnosticsPlugin, FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin,
  5 | };
  6 | use bevy::prelude::*;
  7 | use bevy::window::WindowMode::BorderlessFullscreen;
  8 | use bevy_egui::EguiPlugin;
  9 | 
 10 | use camera::*;
 11 | use spawners::*;
 12 | 
 13 | use crate::defaults::*;
 14 | 
 15 | mod camera;
 16 | mod components;
 17 | mod defaults;
 18 | mod expire_old;
 19 | mod grid;
 20 | mod inputs;
 21 | mod particle_sprites;
 22 | mod spawners;
 23 | mod step_g2p;
 24 | mod step_p2g;
 25 | mod step_update_cells;
 26 | mod step_update_deformations;
 27 | mod step_update_grid;
 28 | mod world;
 29 | 
 30 | fn main() {
 31 |     App::new()
 32 |         .insert_resource(Msaa { samples: 4 })
 33 |         .insert_resource(WindowDescriptor {
 34 |             title: "mlsmpm-particles-rs".to_string(),
 35 |             //width: DEFAULT_WINDOW_WIDTH,
 36 |             //height: DEFAULT_WINDOW_HEIGHT, // todo mouse cursor still wrong in fullscreen!
 37 |             mode: BorderlessFullscreen,
 38 |             ..Default::default()
 39 |         })
 40 |         .insert_resource(grid::Grid::new(DEFAULT_GRID_WIDTH))
 41 |         .insert_resource(world::WorldState::default())
 42 |         .add_plugins(DefaultPlugins)
 43 |         .add_plugin(LogDiagnosticsPlugin::default())
 44 |         .add_plugin(EguiPlugin)
 45 |         .add_plugin(EntityCountDiagnosticsPlugin::default())
 46 |         .add_plugin(FrameTimeDiagnosticsPlugin::default())
 47 |         .add_startup_system(setup_camera)
 48 |         .add_startup_system(create_initial_spawners)
 49 |         //.add_system(
 50 |         //    set_zoom_from_window_size
 51 |         //        .label("set_zoom_from_window_size")
 52 |         //        .before("handle_inputs"),
 53 |         //)
 54 |         .add_system(bevy::window::close_on_esc)
 55 |         .add_system(
 56 |             inputs::handle_inputs
 57 |                 .label("handle_inputs")
 58 |                 .before("tick_spawners"),
 59 |         )
 60 |         .add_system(
 61 |             spawners::tick_spawners
 62 |                 .label("tick_spawners")
 63 |                 .before("reset_grid"),
 64 |         )
 65 |         .add_system(grid::reset_grid.label("reset_grid").before("update_cells"))
 66 |         .add_system(
 67 |             step_update_cells::update_cells
 68 |                 .label("update_cells")
 69 |                 .before("apply_update_cell_computations"),
 70 |         )
 71 |         .add_system(
 72 |             step_update_cells::apply_update_cell_computations
 73 |                 .label("apply_update_cell_computations")
 74 |                 .before("p2g_f")
 75 |                 .before("p2g_s"),
 76 |         )
 77 |         .add_system(
 78 |             step_p2g::particles_to_grid_fluids
 79 |                 .label("p2g_f")
 80 |                 .before("update_grid"),
 81 |         )
 82 |         .add_system(
 83 |             step_p2g::particles_to_grid_solids
 84 |                 .label("p2g_s")
 85 |                 .before("update_grid"),
 86 |         )
 87 |         .add_system(
 88 |             step_update_grid::update_grid
 89 |                 .label("update_grid")
 90 |                 .before("g2p"),
 91 |         )
 92 |         .add_system(
 93 |             step_g2p::grid_to_particles
 94 |                 .label("g2p")
 95 |                 .before("update_deformation_gradients"),
 96 |         )
 97 |         .add_system(
 98 |             step_update_deformations::update_deformation_gradients
 99 |                 .label("update_deformation_gradients")
100 |                 .before("delete_old_entities"),
101 |         )
102 |         .add_system(
103 |             expire_old::delete_old_entities
104 |                 .label("delete_old_entities")
105 |                 .before("update_sprites"),
106 |         )
107 |         .add_system(particle_sprites::update_sprites.label("update_sprites"))
108 |         .run();
109 | }
110 | 
111 | // todo render to (animated) image output
112 | // https://github.com/bevyengine/bevy/issues/1207
113 | //https://github.com/rmsc/bevy/blob/render_to_file/examples/3d/render_to_file.rs
114 | 


--------------------------------------------------------------------------------
/src/particle_sprites.rs:
--------------------------------------------------------------------------------
 1 | use bevy::prelude::*;
 2 | 
 3 | use crate::components::*;
 4 | use crate::defaults::*;
 5 | 
 6 | pub(super) fn update_sprites(mut particles: Query<(&mut Transform, &Position), With<ParticleTag>>) {
 7 |     // todo adjust size relative to mass, min/max size determined by grid+window sizes
 8 |     // todo color based on velocity. (maybe acceleration?)
 9 |     // todo color based on constitutive model. (or initial texture.)
10 |     particles.par_for_each_mut(PAR_BATCH_SIZE, |(mut transform, position)| {
11 |         transform.translation.x = position.0.x;
12 |         transform.translation.y = position.0.y;
13 |     });
14 | }
15 | 


--------------------------------------------------------------------------------
/src/spawners.rs:
--------------------------------------------------------------------------------
  1 | use bevy::prelude::*;
  2 | use rand::Rng;
  3 | 
  4 | use super::components::*;
  5 | use super::grid::*;
  6 | use super::world::*;
  7 | 
  8 | const LIQUID_PARTICLE_MASS: f32 = 1.;
  9 | const WOOD_PARTICLE_MASS: f32 = 1.;
 10 | const STEEL_PARTICLE_MASS: f32 = 1.5;
 11 | 
 12 | // Tags particle spawner entities
 13 | #[derive(Component)]
 14 | pub(super) struct ParticleSpawnerTag;
 15 | 
 16 | // todo refactor.
 17 | #[allow(dead_code)]
 18 | #[derive(Clone)]
 19 | pub(super) enum SpawnerPattern {
 20 |     SingleParticle,
 21 |     LineHorizontal,
 22 |     LineVertical,
 23 |     Cube,
 24 |     Tower,
 25 |     Triangle,
 26 | }
 27 | 
 28 | #[derive(Clone, Component)]
 29 | pub(super) struct ParticleSpawnerInfo {
 30 |     pub(super) created_at: usize,
 31 |     pub(super) pattern: SpawnerPattern,
 32 |     pub(super) spawn_frequency: usize,
 33 |     pub(super) max_particles: usize,
 34 |     pub(super) particle_duration: usize,
 35 |     pub(super) particle_origin: Vec2,
 36 |     pub(super) particle_velocity: Vec2,
 37 |     pub(super) particle_velocity_random_vec_a: Vec2,
 38 |     pub(super) particle_velocity_random_vec_b: Vec2,
 39 |     pub(super) particle_mass: f32,
 40 | }
 41 | 
 42 | pub(super) fn create_initial_spawners(
 43 |     mut commands: Commands,
 44 |     asset_server: Res<AssetServer>,
 45 |     grid: Res<Grid>,
 46 | ) {
 47 |     // shoot arrows to the right
 48 |     // young's modulus and shear modulus of steel.
 49 |     // 180 Gpa young's
 50 |     // 78Gpa shear
 51 |     commands.spawn_bundle((
 52 |         // todo density option to spawners
 53 |         // todo calculate correct particle mass from material density and particle density
 54 |         ParticleSpawnerInfo {
 55 |             created_at: 0,
 56 |             pattern: SpawnerPattern::Triangle,
 57 |             spawn_frequency: 800,
 58 |             max_particles: 200000,
 59 |             particle_duration: 40000,
 60 |             particle_origin: Vec2::new(1.1 * grid.width as f32 / 4., 1. * grid.width as f32 / 4.),
 61 |             particle_velocity: Vec2::new(100.3, -1.3),
 62 |             particle_velocity_random_vec_a: Vec2::new(-0.0, -0.0),
 63 |             particle_velocity_random_vec_b: Vec2::new(0.0, 0.0),
 64 |             particle_mass: STEEL_PARTICLE_MASS,
 65 |         },
 66 |         steel_properties(),
 67 |         asset_server.load::<Image, &str>("steel_particle.png"),
 68 |         ParticleSpawnerTag,
 69 |     ));
 70 | 
 71 |     // spawn tower on first turn.
 72 |     // searching says the properties of wood/plywood are 9Gpa young's modulus 0.6Gpa shear modulus
 73 |     // but has been increased to 18 Gpa and 6 Gpa to make it more rigid
 74 |     commands.spawn_bundle((
 75 |         ParticleSpawnerInfo {
 76 |             created_at: 0,
 77 |             pattern: SpawnerPattern::Tower,
 78 |             spawn_frequency: 99999999,
 79 |             max_particles: 50000,
 80 |             particle_duration: 500000,
 81 |             particle_origin: Vec2::new(2.5 * grid.width as f32 / 4., 1.),
 82 |             particle_velocity: Vec2::ZERO,
 83 |             particle_velocity_random_vec_a: Vec2::ZERO,
 84 |             particle_velocity_random_vec_b: Vec2::ZERO,
 85 |             particle_mass: WOOD_PARTICLE_MASS,
 86 |         },
 87 |         NeoHookeanHyperElasticModel {
 88 |             deformation_gradient: Default::default(),
 89 |             elastic_lambda: 18. * 1000.,
 90 |             elastic_mu: 6. * 1000.,
 91 |         },
 92 |         asset_server.load::<Image, &str>("wood_particle.png"),
 93 |         ParticleSpawnerTag,
 94 |     ));
 95 | 
 96 |     // make it rain!
 97 |     commands.spawn_bundle((
 98 |         ParticleSpawnerInfo {
 99 |             created_at: 0,
100 |             pattern: SpawnerPattern::Cube,
101 |             spawn_frequency: 78,
102 |             max_particles: 75000,
103 |             particle_duration: 100000,
104 |             particle_origin: Vec2::new(
105 |                 0.5 * grid.width as f32 / 4. + 12.,
106 |                 3. * grid.width as f32 / 4. + 16.,
107 |             ),
108 |             particle_velocity: Vec2::new(-20., -55.),
109 |             particle_velocity_random_vec_a: Vec2::ZERO,
110 |             particle_velocity_random_vec_b: Vec2::ZERO,
111 |             particle_mass: LIQUID_PARTICLE_MASS,
112 |         },
113 |         water_properties(),
114 |         asset_server.load::<Image, &str>("liquid_particle.png"),
115 |         ParticleSpawnerTag,
116 |     ));
117 |     commands.spawn_bundle((
118 |         ParticleSpawnerInfo {
119 |             created_at: 0,
120 |             pattern: SpawnerPattern::Cube,
121 |             spawn_frequency: 478,
122 |             max_particles: 75000,
123 |             particle_duration: 100000,
124 |             particle_origin: Vec2::new(
125 |                 0.5 * grid.width as f32 / 4. + 20.,
126 |                 3. * grid.width as f32 / 4. + 12.,
127 |             ),
128 |             particle_velocity: Vec2::new(-20., -35.),
129 |             particle_velocity_random_vec_a: Vec2::ZERO,
130 |             particle_velocity_random_vec_b: Vec2::ZERO,
131 |             particle_mass: LIQUID_PARTICLE_MASS,
132 |         },
133 |         water_properties(),
134 |         asset_server.load::<Image, &str>("liquid_particle.png"),
135 |         ParticleSpawnerTag,
136 |     ));
137 |     commands.spawn_bundle((
138 |         ParticleSpawnerInfo {
139 |             created_at: 0,
140 |             pattern: SpawnerPattern::Cube,
141 |             spawn_frequency: 478,
142 |             max_particles: 75000,
143 |             particle_duration: 100000,
144 |             particle_origin: Vec2::new(
145 |                 0.5 * grid.width as f32 / 4. - 16.,
146 |                 3. * grid.width as f32 / 4.,
147 |             ),
148 |             particle_velocity: Vec2::new(30., -35.),
149 |             particle_velocity_random_vec_a: Vec2::ZERO,
150 |             particle_velocity_random_vec_b: Vec2::ZERO,
151 |             particle_mass: LIQUID_PARTICLE_MASS,
152 |         },
153 |         water_properties(),
154 |         asset_server.load::<Image, &str>("liquid_particle.png"),
155 |         ParticleSpawnerTag,
156 |     ));
157 |     commands.spawn_bundle((
158 |         ParticleSpawnerInfo {
159 |             created_at: 0,
160 |             pattern: SpawnerPattern::Cube,
161 |             spawn_frequency: 800,
162 |             max_particles: 75000,
163 |             particle_duration: 100000,
164 |             particle_origin: Vec2::new(
165 |                 0.5 * grid.width as f32 / 4. - 8.,
166 |                 3. * grid.width as f32 / 4.,
167 |             ),
168 |             particle_velocity: Vec2::new(40., -45.),
169 |             particle_velocity_random_vec_a: Vec2::ZERO,
170 |             particle_velocity_random_vec_b: Vec2::ZERO,
171 |             particle_mass: LIQUID_PARTICLE_MASS,
172 |         },
173 |         water_properties(),
174 |         asset_server.load::<Image, &str>("liquid_particle.png"),
175 |         ParticleSpawnerTag,
176 |     ));
177 |     commands.spawn_bundle((
178 |         ParticleSpawnerInfo {
179 |             created_at: 0,
180 |             pattern: SpawnerPattern::Cube,
181 |             spawn_frequency: 700,
182 |             max_particles: 75000,
183 |             particle_duration: 100000,
184 |             particle_origin: Vec2::new(0.5 * grid.width as f32 / 4., 3. * grid.width as f32 / 4.),
185 |             particle_velocity: Vec2::new(50., -45.),
186 |             particle_velocity_random_vec_a: Vec2::ZERO,
187 |             particle_velocity_random_vec_b: Vec2::ZERO,
188 |             particle_mass: LIQUID_PARTICLE_MASS,
189 |         },
190 |         water_properties(),
191 |         asset_server.load::<Image, &str>("liquid_particle.png"),
192 |         ParticleSpawnerTag,
193 |     ));
194 |     commands.spawn_bundle((
195 |         ParticleSpawnerInfo {
196 |             created_at: 0,
197 |             pattern: SpawnerPattern::Cube,
198 |             spawn_frequency: 600,
199 |             max_particles: 75000,
200 |             particle_duration: 100000,
201 |             particle_origin: Vec2::new(
202 |                 0.5 * grid.width as f32 / 4. + 8.,
203 |                 3. * grid.width as f32 / 4.,
204 |             ),
205 |             particle_velocity: Vec2::new(10., -45.),
206 |             particle_velocity_random_vec_a: Vec2::ZERO,
207 |             particle_velocity_random_vec_b: Vec2::ZERO,
208 |             particle_mass: LIQUID_PARTICLE_MASS,
209 |         },
210 |         water_properties(),
211 |         asset_server.load::<Image, &str>("liquid_particle.png"),
212 |         ParticleSpawnerTag,
213 |     ));
214 | }
215 | 
216 | pub(super) fn tick_spawners(
217 |     mut commands: Commands,
218 |     world: Res<WorldState>,
219 |     grid: Res<Grid>,
220 |     particles: Query<(), With<ParticleTag>>,
221 |     spawners_solids: Query<
222 |         (
223 |             &ParticleSpawnerInfo,
224 |             &NeoHookeanHyperElasticModel,
225 |             &Handle<Image>,
226 |         ),
227 |         With<ParticleSpawnerTag>,
228 |     >,
229 |     spawners_fluids: Query<
230 |         (&ParticleSpawnerInfo, &NewtonianFluidModel, &Handle<Image>),
231 |         With<ParticleSpawnerTag>,
232 |     >,
233 | ) {
234 |     // todo recreate spiral spawn pattern - rate per spawn and rotation per spawn
235 | 
236 |     spawners_solids.for_each(|(spawner_info, particle_properties, texture)| {
237 |         if (world.current_tick - spawner_info.created_at) % spawner_info.spawn_frequency == 0
238 |             && particles.iter().count() < spawner_info.max_particles
239 |         {
240 |             spawn_particles(
241 |                 spawner_info,
242 |                 *particle_properties,
243 |                 &mut commands,
244 |                 texture.clone(),
245 |                 &world,
246 |                 &grid,
247 |             );
248 |         }
249 |     });
250 | 
251 |     spawners_fluids.for_each(|(spawner_info, particle_properties, texture)| {
252 |         if (world.current_tick - spawner_info.created_at) % spawner_info.spawn_frequency == 0
253 |             && particles.iter().count() < spawner_info.max_particles
254 |         {
255 |             spawn_particles(
256 |                 spawner_info,
257 |                 *particle_properties,
258 |                 &mut commands,
259 |                 texture.clone(),
260 |                 &world,
261 |                 &grid,
262 |             );
263 |         }
264 |     });
265 | }
266 | 
267 | fn spawn_particle(
268 |     commands: &mut Commands,
269 |     grid_width: usize,
270 |     cm: impl ConstitutiveModel + Copy,
271 |     spawner_info: &ParticleSpawnerInfo,
272 |     spawn_offset: Vec2,
273 |     vel: Option<Vec2>,
274 |     texture: Handle<Image>,
275 |     created_at: usize,
276 | ) {
277 |     let particle_position = spawner_info.particle_origin + spawn_offset;
278 | 
279 |     let min = 3;
280 |     let max = grid_width - 4;
281 |     if particle_position.x <= min as f32 || particle_position.x >= max as f32 {
282 |         return;
283 |     }
284 |     if particle_position.y <= min as f32 || particle_position.y >= max as f32 {
285 |         return;
286 |     }
287 | 
288 |     cm.new_particle(
289 |         commands,
290 |         texture.clone(),
291 |         particle_position,
292 |         spawner_info.particle_mass,
293 |         created_at,
294 |         vel,
295 |         Some(spawner_info.particle_duration),
296 |     );
297 | }
298 | 
299 | pub(super) fn spawn_particles(
300 |     spawner_info: &ParticleSpawnerInfo,
301 |     cm: impl ConstitutiveModel + Copy,
302 |     commands: &mut Commands,
303 |     texture: Handle<Image>,
304 |     world: &WorldState,
305 |     grid: &Res<Grid>,
306 | ) {
307 |     // todo prevent out-of-bounds spawning here.
308 | 
309 |     let mut rng = rand::thread_rng();
310 |     let base_vel = spawner_info.particle_velocity;
311 |     let random_a_contrib = Vec2::new(
312 |         rng.gen::<f32>() * spawner_info.particle_velocity_random_vec_a.x,
313 |         rng.gen::<f32>() * spawner_info.particle_velocity_random_vec_a.y,
314 |     );
315 |     let random_b_contrib = Vec2::new(
316 |         rng.gen::<f32>() * spawner_info.particle_velocity_random_vec_b.x,
317 |         rng.gen::<f32>() * spawner_info.particle_velocity_random_vec_b.y,
318 |     );
319 |     let spawn_vel = base_vel + random_a_contrib + random_b_contrib;
320 | 
321 |     match spawner_info.pattern {
322 |         SpawnerPattern::SingleParticle => {
323 |             spawn_particle(
324 |                 commands,
325 |                 grid.width,
326 |                 cm,
327 |                 spawner_info,
328 |                 Vec2::ZERO,
329 |                 Some(spawn_vel),
330 |                 texture.clone(),
331 |                 world.current_tick,
332 |             );
333 |         }
334 |         SpawnerPattern::LineHorizontal => {
335 |             for x in 0..100 {
336 |                 spawn_particle(
337 |                     commands,
338 |                     grid.width,
339 |                     cm,
340 |                     spawner_info,
341 |                     Vec2::new(x as f32, 0.),
342 |                     Some(spawn_vel),
343 |                     texture.clone(),
344 |                     world.current_tick,
345 |                 );
346 |             }
347 |         }
348 |         SpawnerPattern::LineVertical => {
349 |             for y in 0..15 {
350 |                 spawn_particle(
351 |                     commands,
352 |                     grid.width,
353 |                     cm,
354 |                     spawner_info,
355 |                     Vec2::new(0., y as f32),
356 |                     Some(spawn_vel),
357 |                     texture.clone(),
358 |                     world.current_tick,
359 |                 );
360 |             }
361 |         }
362 |         SpawnerPattern::Cube => {
363 |             for x in 0..15 {
364 |                 for y in 0..15 {
365 |                     spawn_particle(
366 |                         commands,
367 |                         grid.width,
368 |                         cm,
369 |                         spawner_info,
370 |                         Vec2::new(x as f32 + 0.001, y as f32 + 0.001),
371 |                         Some(spawn_vel),
372 |                         texture.clone(),
373 |                         world.current_tick,
374 |                     );
375 |                 }
376 |             }
377 |         }
378 |         SpawnerPattern::Tower => {
379 |             for x in 0..80 {
380 |                 for y in 0..90 {
381 |                     spawn_particle(
382 |                         commands,
383 |                         grid.width,
384 |                         cm,
385 |                         spawner_info,
386 |                         Vec2::new(x as f32, y as f32),
387 |                         Some(spawn_vel),
388 |                         texture.clone(),
389 |                         world.current_tick,
390 |                     );
391 |                 }
392 |             }
393 |         }
394 |         SpawnerPattern::Triangle => {
395 |             let x_axis: Vec2 = Vec2::new(1., 0.);
396 |             let angle = match spawn_vel.length() {
397 |                 0. => 0.,
398 |                 _ => x_axis.angle_between(spawn_vel),
399 |             };
400 | 
401 |             for x in 0..30 {
402 |                 for y in 0..x {
403 |                     // offset y by 0.5 every other time
404 |                     let mut ya: f32 = if x % 2 == 0 {
405 |                         y as f32 - 0.25
406 |                     } else {
407 |                         y as f32 + 0.25
408 |                     };
409 |                     ya -= x as f32 / 2.;
410 | 
411 |                     // rotate by angle about triangle tip (15, 0)
412 |                     let pivot: Vec2 = Vec2::new(15., 0.);
413 |                     let pos: Vec2 = Vec2::new(
414 |                         (0.001 + pivot.x - x as f32) / 4.,
415 |                         (0.001 + pivot.y + ya as f32) / 4.,
416 |                     );
417 | 
418 |                     // 1. translate point back to origin
419 |                     let pos_rel_origin: Vec2 = Vec2::new(pos.x - pivot.x, pos.y - pivot.y);
420 | 
421 |                     // 2. rotate point
422 |                     let pos_rel_origin_rotated: Vec2 = Vec2::new(
423 |                         pos_rel_origin.x * angle.cos() - pos_rel_origin.y * angle.sin(),
424 |                         pos_rel_origin.x * angle.sin() + pos_rel_origin.y * angle.cos(),
425 |                     );
426 | 
427 |                     // 3. translate point back:
428 |                     let pos_rotated: Vec2 = pos_rel_origin_rotated + pivot;
429 | 
430 |                     spawn_particle(
431 |                         commands,
432 |                         grid.width,
433 |                         cm,
434 |                         spawner_info,
435 |                         pos_rotated,
436 |                         Some(spawn_vel),
437 |                         texture.clone(),
438 |                         world.current_tick,
439 |                     );
440 |                 }
441 |             }
442 |         }
443 |     }
444 | }
445 | 


--------------------------------------------------------------------------------
/src/step_g2p.rs:
--------------------------------------------------------------------------------
 1 | use bevy::math::Mat2;
 2 | use bevy::prelude::*;
 3 | 
 4 | use crate::components::*;
 5 | use crate::defaults::*;
 6 | use crate::grid::*;
 7 | use crate::world::*;
 8 | 
 9 | // G2P MPM step
10 | pub(super) fn grid_to_particles(
11 |     world: Res<WorldState>,
12 |     grid: Res<Grid>,
13 |     mut particles: Query<(&mut Position, &mut Velocity, &mut AffineMomentum), With<ParticleTag>>,
14 | ) {
15 |     particles.par_for_each_mut(
16 |         PAR_BATCH_SIZE,
17 |         |(mut position, mut velocity, mut affine_momentum)| {
18 |             //// reset particle velocity. we calculate it from scratch each step using the grid
19 |             velocity.0 = Vec2::ZERO;
20 | 
21 |             let cell_x: u32 = position.0.x as u32;
22 |             let cell_y: u32 = position.0.y as u32;
23 |             let cell_diff = Vec2::new(
24 |                 position.0.x - cell_x as f32 - 0.5,
25 |                 position.0.y - cell_y as f32 - 0.5,
26 |             );
27 |             let weights = quadratic_interpolation_weights(cell_diff);
28 | 
29 |             // affine per-particle momentum matrix from APIC / MLS-MPM.
30 |             // see APIC paper (https://web.archive.org/web/20190427165435/https://www.math.ucla.edu/~jteran/papers/JSSTS15.pdf), page 6
31 |             // below equation 11 for clarification. this is calculating C = B * (D^-1) for APIC equation 8,
32 |             // where B is calculated in the inner loop at (D^-1) = 4 is a constant when using quadratic interpolation functions
33 |             let mut b = Mat2::ZERO;
34 |             // for all surrounding 9 cells
35 |             for gx in 0..3 {
36 |                 for gy in 0..3 {
37 |                     let weight = weights[gx].x * weights[gy].y;
38 |                     let cell_pos_x = (cell_x as i32 + gx as i32) - 1;
39 |                     let cell_pos_y = (cell_y as i32 + gy as i32) - 1;
40 |                     let cell_dist = Vec2::new(
41 |                         cell_pos_x as f32 - position.0.x + 0.5,
42 |                         cell_pos_y as f32 - position.0.y + 0.5,
43 |                     );
44 | 
45 |                     let cell_at_index =
46 |                         // todo why was this fine when using grid directly?
47 |                         grid.index_at(cell_pos_x as usize, cell_pos_y as usize);
48 |                     let weighted_velocity = grid.cells[cell_at_index].velocity * weight;
49 |                     b += weighted_velocity_and_cell_dist_to_term(weighted_velocity, cell_dist);
50 |                     velocity.0 += weighted_velocity;
51 |                 }
52 |             }
53 | 
54 |             affine_momentum.0 = b * 4.0;
55 | 
56 |             // advect particles
57 |             position.0 += velocity.0 * world.dt;
58 | 
59 |             //// safety clamp to ensure particles don't exit simulation domain
60 |             position.0.x = position.0.x.clamp(1.0, (grid.width - 2) as f32);
61 |             position.0.y = position.0.y.clamp(1.0, (grid.width - 2) as f32);
62 | 
63 |             // predictive boundary velocity cap
64 |             let wall_min: f32 = 3.0;
65 |             let wall_max: f32 = (grid.width - 1) as f32 - wall_min;
66 | 
67 |             // apply boundary conditions about 0.1 seconds before reaching edge
68 |             let dt_multiplier = 0.1 / world.dt;
69 |             let position_next = position.0 + velocity.0 * world.dt * dt_multiplier;
70 |             if position_next.x < wall_min {
71 |                 velocity.0.x += wall_min - position_next.x;
72 |             }
73 |             if position_next.x > wall_max {
74 |                 velocity.0.x += wall_max - position_next.x;
75 |             }
76 |             if position_next.y < wall_min {
77 |                 velocity.0.y += wall_min - position_next.y;
78 |             }
79 |             if position_next.y > wall_max {
80 |                 velocity.0.y += wall_max - position_next.y;
81 |             }
82 |         },
83 |     );
84 | }
85 | 


--------------------------------------------------------------------------------
/src/step_p2g.rs:
--------------------------------------------------------------------------------
  1 | use std::ops::{Add, Mul, Sub};
  2 | 
  3 | use bevy::math::Mat2;
  4 | use bevy::prelude::*;
  5 | 
  6 | use crate::components::*;
  7 | use crate::defaults::*;
  8 | use crate::grid::*;
  9 | use crate::world::*;
 10 | 
 11 | pub(super) fn particles_to_grid_solids(
 12 |     grid: Res<Grid>,
 13 |     world: Res<WorldState>,
 14 |     mut particles_solid: Query<
 15 |         (
 16 |             &Position,
 17 |             &Mass,
 18 |             &AffineMomentum,
 19 |             &NeoHookeanHyperElasticModel,
 20 |             &mut CellMassMomentumContributions,
 21 |         ),
 22 |         With<ParticleTag>,
 23 |     >,
 24 | ) {
 25 |     let num_particles = particles_solid.iter().count();
 26 |     if num_particles < 1 {
 27 |         return;
 28 |     }
 29 |     particles_solid.par_for_each_mut(PAR_BATCH_SIZE, |(position, mass, _, pp, mut mmc)| {
 30 |         let cell_x: u32 = position.0.x as u32;
 31 |         let cell_y: u32 = position.0.y as u32;
 32 |         let cell_diff = Vec2::new(
 33 |             position.0.x - cell_x as f32 - 0.5,
 34 |             position.0.y - cell_y as f32 - 0.5,
 35 |         );
 36 |         let weights = quadratic_interpolation_weights(cell_diff);
 37 | 
 38 |         // check surrounding 9 cells to get volume from density
 39 |         let mut density: f32 = 0.0;
 40 |         for gx in 0..3 {
 41 |             for gy in 0..3 {
 42 |                 let weight = weights[gx].x * weights[gy].y;
 43 |                 let cell_pos_x = (cell_x as i32 + gx as i32) - 1;
 44 |                 let cell_pos_y = (cell_y as i32 + gy as i32) - 1;
 45 |                 let cell_at_index = grid.index_at(cell_pos_x as usize, cell_pos_y as usize);
 46 |                 density += grid.cells[cell_at_index].mass * weight;
 47 |             }
 48 |         }
 49 | 
 50 |         let volume = mass.0 / density;
 51 | 
 52 |         let j: f32 = pp.deformation_gradient.determinant();
 53 |         let volume_scaled = volume * j;
 54 | 
 55 |         let f_t: Mat2 = pp.deformation_gradient.transpose();
 56 |         let f_inv_t = f_t.inverse();
 57 |         let f_minus_f_inv_t = pp.deformation_gradient.sub(f_inv_t);
 58 | 
 59 |         let p_term_0: Mat2 = f_minus_f_inv_t.mul(pp.elastic_mu);
 60 |         let p_term_1: Mat2 = f_inv_t.mul(j.ln() * pp.elastic_lambda);
 61 |         let p_combined: Mat2 = p_term_0.add(p_term_1);
 62 | 
 63 |         let stress: Mat2 = p_combined.mul_mat2(&f_t).mul(1.0 / j);
 64 |         let eq_16_term_0 = stress * (-volume_scaled * 4.0 * world.dt);
 65 | 
 66 |         // for all surrounding 9 cells
 67 |         for gx in 0..3 {
 68 |             for gy in 0..3 {
 69 |                 let weight = weights[gx].x * weights[gy].y;
 70 |                 let cell_pos_x = (cell_x as i32 + gx as i32) - 1;
 71 |                 let cell_pos_y = (cell_y as i32 + gy as i32) - 1;
 72 |                 let cell_dist = Vec2::new(
 73 |                     cell_pos_x as f32 - position.0.x + 0.5,
 74 |                     cell_pos_y as f32 - position.0.y + 0.5,
 75 |                 );
 76 |                 let cell_at_index = grid.index_at(cell_pos_x as usize, cell_pos_y as usize);
 77 |                 // store the fused force/momentum update from MLS-MPM to apply onto grid later.
 78 |                 // todo combine into grid(x,y) = total changes as they come in here...?
 79 |                 mmc.0[gx + 3 * gy] = GridMassAndMomentumChange(
 80 |                     cell_at_index,
 81 |                     0.,
 82 |                     eq_16_term_0.mul_scalar(weight).mul_vec2(cell_dist),
 83 |                 );
 84 |             }
 85 |         }
 86 |     });
 87 | }
 88 | 
 89 | pub(super) fn particles_to_grid_fluids(
 90 |     world: Res<WorldState>,
 91 |     grid: Res<Grid>,
 92 |     mut particles_fluid: Query<
 93 |         (
 94 |             &Position,
 95 |             &Mass,
 96 |             &AffineMomentum,
 97 |             &NewtonianFluidModel,
 98 |             &mut CellMassMomentumContributions,
 99 |         ),
100 |         With<ParticleTag>,
101 |     >,
102 | ) {
103 |     let num_particles = particles_fluid.iter().count();
104 |     if num_particles < 1 {
105 |         return;
106 |     }
107 |     particles_fluid.par_for_each_mut(
108 |         PAR_BATCH_SIZE,
109 |         |(position, mass, affine_momentum, pp, mut mmc)| {
110 |             let cell_x: u32 = position.0.x as u32;
111 |             let cell_y: u32 = position.0.y as u32;
112 |             let cell_diff = Vec2::new(
113 |                 position.0.x - cell_x as f32 - 0.5,
114 |                 position.0.y - cell_y as f32 - 0.5,
115 |             );
116 |             let weights = quadratic_interpolation_weights(cell_diff);
117 | 
118 |             // check surrounding 9 cells to get volume from density
119 |             let mut density: f32 = 0.0;
120 |             for gx in 0..3 {
121 |                 for gy in 0..3 {
122 |                     let weight = weights[gx].x * weights[gy].y;
123 |                     let cell_pos_x = (cell_x as i32 + gx as i32) - 1;
124 |                     let cell_pos_y = (cell_y as i32 + gy as i32) - 1;
125 |                     let cell_at_index = grid.index_at(cell_pos_x as usize, cell_pos_y as usize);
126 |                     density += grid.cells[cell_at_index].mass * weight;
127 |                 }
128 |             }
129 | 
130 |             let volume = mass.0 / density;
131 | 
132 |             // fluid constitutive model
133 |             let pressure = f32::max(
134 |                 -0.1,
135 |                 pp.eos_stiffness * (f32::powf(density / pp.rest_density, pp.eos_power) - 1.0),
136 |             );
137 |             let mut stress = Mat2::from_cols(Vec2::new(-pressure, 0.0), Vec2::new(0.0, -pressure));
138 |             let mut strain = affine_momentum.0;
139 |             let trace = strain.y_axis.x + strain.x_axis.y;
140 |             strain.y_axis.x = trace;
141 |             strain.x_axis.y = trace;
142 |             let viscosity_term = strain * pp.dynamic_viscosity;
143 |             stress += viscosity_term;
144 | 
145 |             let eq_16_term_0 = stress * (-volume * 4.0 * world.dt);
146 | 
147 |             // for all surrounding 9 cells
148 |             for gx in 0..3 {
149 |                 for gy in 0..3 {
150 |                     let weight = weights[gx].x * weights[gy].y;
151 |                     let cell_pos_x = (cell_x as i32 + gx as i32) - 1;
152 |                     let cell_pos_y = (cell_y as i32 + gy as i32) - 1;
153 |                     let cell_dist = Vec2::new(
154 |                         cell_pos_x as f32 - position.0.x + 0.5,
155 |                         cell_pos_y as f32 - position.0.y + 0.5,
156 |                     );
157 |                     let cell_at_index = grid.index_at(cell_pos_x as usize, cell_pos_y as usize);
158 |                     let momentum = eq_16_term_0 * weight * cell_dist;
159 |                     mmc.0[gx + 3 * gy] = GridMassAndMomentumChange(cell_at_index, 0., momentum);
160 |                 }
161 |             }
162 |         },
163 |     );
164 | }
165 | 


--------------------------------------------------------------------------------
/src/step_update_cells.rs:
--------------------------------------------------------------------------------
 1 | use bevy::prelude::*;
 2 | 
 3 | use crate::components::*;
 4 | use crate::defaults::*;
 5 | use crate::grid::*;
 6 | 
 7 | pub(super) fn update_cells(
 8 |     grid: Res<Grid>,
 9 |     mut particles: Query<
10 |         (
11 |             &Position,
12 |             &Velocity,
13 |             &Mass,
14 |             &AffineMomentum,
15 |             &mut CellMassMomentumContributions,
16 |         ),
17 |         With<ParticleTag>,
18 |     >,
19 | ) {
20 |     let num_particles = particles.iter().count();
21 |     if num_particles < 1 {
22 |         return;
23 |     }
24 |     particles.par_for_each_mut(
25 |         PAR_BATCH_SIZE,
26 |         |(position, velocity, mass, affine_momentum, mut mmc)| {
27 |             let cell_x: u32 = position.0.x as u32;
28 |             let cell_y: u32 = position.0.y as u32;
29 |             let cell_diff = Vec2::new(
30 |                 position.0.x - cell_x as f32 - 0.5,
31 |                 position.0.y - cell_y as f32 - 0.5,
32 |             );
33 |             let weights = quadratic_interpolation_weights(cell_diff);
34 | 
35 |             //collect momentum changes for surrounding 9 cells.
36 |             for gx in 0..3 {
37 |                 for gy in 0..3 {
38 |                     let weight = weights[gx].x * weights[gy].y;
39 |                     let cell_pos_x = (cell_x as i32 + gx as i32) - 1;
40 |                     let cell_pos_y = (cell_y as i32 + gy as i32) - 1;
41 |                     let cell_dist = Vec2::new(
42 |                         cell_pos_x as f32 - position.0.x + 0.5,
43 |                         cell_pos_y as f32 - position.0.y + 0.5,
44 |                     );
45 |                     let cell_at_index = grid.index_at(cell_pos_x as usize, cell_pos_y as usize);
46 | 
47 |                     let q = affine_momentum.0 * cell_dist;
48 |                     let mass_contrib = weight * mass.0;
49 |                     // mass and momentum update
50 |                     mmc.0[gx + 3 * gy] = GridMassAndMomentumChange(
51 |                         cell_at_index,
52 |                         mass_contrib,
53 |                         (velocity.0 + q) * mass_contrib,
54 |                     );
55 |                 }
56 |             }
57 |         },
58 |     );
59 | }
60 | 
61 | // todo look into replacing CellMassMomentumContributions with bevy events ..
62 | // .. after this one is done https://github.com/bevyengine/bevy/issues/2648
63 | pub(super) fn apply_update_cell_computations(
64 |     mut grid: ResMut<Grid>,
65 |     particles: Query<(&CellMassMomentumContributions,), With<ParticleTag>>,
66 | ) {
67 |     particles.for_each(|mmc| {
68 |         for change in mmc.0 .0.iter() {
69 |             grid.cells[change.0].mass += change.1;
70 |             grid.cells[change.0].velocity += change.2;
71 |         }
72 |     });
73 | }
74 | 


--------------------------------------------------------------------------------
/src/step_update_deformations.rs:
--------------------------------------------------------------------------------
 1 | use std::ops::{Add, Mul};
 2 | 
 3 | use bevy::math::Mat2;
 4 | use bevy::prelude::*;
 5 | 
 6 | use crate::components::*;
 7 | use crate::defaults::*;
 8 | use crate::world::*;
 9 | 
10 | pub(super) fn update_deformation_gradients(
11 |     world: Res<WorldState>,
12 |     mut particles_solid: Query<
13 |         (&AffineMomentum, &mut NeoHookeanHyperElasticModel),
14 |         With<ParticleTag>,
15 |     >,
16 | ) {
17 |     particles_solid.par_for_each_mut(PAR_BATCH_SIZE, |(affine_momentum, mut pp)| {
18 |         let deformation_new: Mat2 = Mat2::IDENTITY
19 |             .add(affine_momentum.0.mul(world.dt))
20 |             .mul_mat2(&pp.deformation_gradient);
21 |         pp.deformation_gradient = deformation_new;
22 | 
23 |         // todo investigate plastic deformation that makes material want to keep its damaged state.
24 |     });
25 | }
26 | 


--------------------------------------------------------------------------------
/src/step_update_grid.rs:
--------------------------------------------------------------------------------
 1 | use bevy::prelude::*;
 2 | 
 3 | use crate::components::*;
 4 | use crate::grid::Grid;
 5 | use crate::world::*;
 6 | 
 7 | pub(super) fn update_grid(
 8 |     mut grid: ResMut<Grid>,
 9 |     mut world: ResMut<WorldState>,
10 |     particles: Query<(&CellMassMomentumContributions,), With<ParticleTag>>,
11 | ) {
12 |     particles.for_each(|mmc| {
13 |         for change in mmc.0 .0.iter() {
14 |             grid.cells[change.0].velocity += change.2;
15 |         }
16 |     });
17 | 
18 |     world.update();
19 |     grid.update(
20 |         world.dt,
21 |         if world.gravity_enabled {
22 |             world.gravity
23 |         } else {
24 |             0.
25 |         },
26 |     );
27 | }
28 | 


--------------------------------------------------------------------------------
/src/test.rs:
--------------------------------------------------------------------------------
  1 | use bevy::math::{Mat2, Vec2};
  2 | 
  3 | #[cfg(test)]
  4 | mod tests {
  5 |     use crate::*;
  6 | 
  7 |     // Note this useful idiom: importing names from outer (for mod tests) scope.
  8 |     use super::*;
  9 | 
 10 |     const TEST_GRID_WIDTH: usize = 10;
 11 |     const TEST_DT: f32 = 0.1;
 12 |     const TEST_GRAVITY: f32 = -0.3;
 13 | 
 14 |     #[test]
 15 |     fn test_quadratic_interpolation_weights() {
 16 |         let cell_diff = Vec2::new(-0.5, -0.5);
 17 |         let weights = quadratic_interpolation_weights(cell_diff);
 18 |         assert_eq!(
 19 |             [
 20 |                 Vec2::new(0.5, 0.5),
 21 |                 Vec2::new(0.5, 0.5),
 22 |                 Vec2::new(0.0, 0.0)
 23 |             ],
 24 |             weights
 25 |         );
 26 |     }
 27 | 
 28 |     #[test]
 29 |     fn test_weighted_velocity_and_cell_dist_to_term_x_zero() {
 30 |         let zm = Mat2::from_cols(Vec2::new(0.0, 0.0), Vec2::new(1.0, 1.0));
 31 |         assert_eq!(
 32 |             weighted_velocity_and_cell_dist_to_term(Vec2::new(1.0, 1.0), Vec2::new(0.0, 1.0)),
 33 |             zm
 34 |         );
 35 |         assert_eq!(0.0, zm.determinant());
 36 |     }
 37 | 
 38 |     #[test]
 39 |     fn test_weighted_velocity_and_cell_dist_to_term_y_zero() {
 40 |         let zm = Mat2::from_cols(Vec2::new(1.0, 1.0), Vec2::new(0.0, 0.0));
 41 |         assert_eq!(
 42 |             weighted_velocity_and_cell_dist_to_term(Vec2::new(1.0, 1.0), Vec2::new(1.0, 0.0)),
 43 |             zm
 44 |         );
 45 |         assert_eq!(0.0, zm.determinant());
 46 |     }
 47 | 
 48 |     #[test]
 49 |     fn test_weighted_velocity_and_cell_dist_to_term() {
 50 |         let zm = Mat2::from_cols(
 51 |             Vec2::new(0.22 * 2.0, 0.77 * 2.0),
 52 |             Vec2::new(0.22 * -1.0, 0.77 * -1.0),
 53 |         );
 54 |         assert_eq!(
 55 |             weighted_velocity_and_cell_dist_to_term(Vec2::new(0.22, 0.77), Vec2::new(2.0, -1.0)),
 56 |             zm
 57 |         );
 58 |         assert_eq!(0.0, zm.determinant());
 59 |         assert_eq!(zm.row(0).x, 0.22 * 2.0);
 60 |         assert_eq!(zm.row(1).x, 0.77 * 2.0);
 61 |     }
 62 | 
 63 |     #[test]
 64 |     // in update_cells system, a single particle in freefall should update mass and velocity of surrounding cells.
 65 |     fn test_update_cells_iteration() {
 66 |         let mut world = World::default();
 67 |         let mut update_stage = SystemStage::parallel();
 68 |         world.insert_resource(Grid {
 69 |             cells: vec![
 70 |                 Cell {
 71 |                     velocity: Vec2::ZERO,
 72 |                     mass: 0.0,
 73 |                 };
 74 |                 TEST_GRID_WIDTH * TEST_GRID_WIDTH,
 75 |             ],
 76 |             width: TEST_GRID_WIDTH,
 77 |             dt: TEST_DT,
 78 |             current_tick: 0,
 79 |             gravity_enabled: true,
 80 |             gravity: TEST_GRAVITY,
 81 |         });
 82 |         update_stage.add_system(update_cells);
 83 |         // add particle to world
 84 |         let particle_id = world
 85 |             .spawn()
 86 |             .insert_bundle((
 87 |                 Position(Vec2::new(5.0, 5.0)),
 88 |                 Velocity(Vec2::new(0.0, -1.0)),
 89 |                 Mass(1.06),
 90 |                 AffineMomentum(Mat2::from_cols(
 91 |                     Vec2::new(-0.4838, 0.01124),
 92 |                     Vec2::new(-0.0248, 0.169),
 93 |                 )),
 94 |                 ParticleTag,
 95 |             ))
 96 |             .id();
 97 |         // iterate systems
 98 |         update_stage.run(&mut world);
 99 | 
100 |         // particle position should not change
101 |         let particle_position = world.get::<Position>(particle_id);
102 |         assert_eq!(particle_position.unwrap().0, Vec2::new(5.0, 5.0));
103 |         //// particle velocity should not change.
104 |         let particle_velocity = world.get::<Velocity>(particle_id);
105 |         assert_eq!(particle_velocity.unwrap().0, Vec2::new(0.0, -1.0));
106 |         // particle affine momentum should not change
107 |         let particle_momentum = world.get::<AffineMomentum>(particle_id);
108 |         // access col major
109 |         assert_eq!(particle_momentum.unwrap().0.x_axis.x, -0.4838);
110 |         assert_eq!(particle_momentum.unwrap().0.x_axis.y, 0.01124);
111 |         assert_eq!(particle_momentum.unwrap().0.y_axis.x, -0.0248);
112 |         assert_eq!(particle_momentum.unwrap().0.y_axis.y, 0.169);
113 |         // access row major
114 |         assert_eq!(particle_momentum.unwrap().0.row(0).x, -0.4838);
115 |         assert_eq!(particle_momentum.unwrap().0.row(0).y, -0.0248);
116 |         assert_eq!(particle_momentum.unwrap().0.row(1).x, 0.01124);
117 |         assert_eq!(particle_momentum.unwrap().0.row(1).y, 0.169);
118 | 
119 |         //// local grid cells should be updated from particle.
120 |         let gr = world.get_resource::<Grid>().unwrap();
121 |         assert_eq!(gr.cells[44].mass, 0.265);
122 |         assert_eq!(gr.cells[45].mass, 0.265);
123 |         assert_eq!(gr.cells[46].mass, 0.0);
124 |         assert_eq!(gr.cells[54].mass, 0.265);
125 |         assert_eq!(gr.cells[55].mass, 0.265);
126 |         assert_eq!(gr.cells[56].mass, 0.0);
127 |         assert_eq!(gr.cells[64].mass, 0.0);
128 |         assert_eq!(gr.cells[65].mass, 0.0);
129 |         assert_eq!(gr.cells[66].mass, 0.0);
130 |         assert_eq!(true, approx_equal(gr.cells[44].velocity.x, 0.0673895, 5));
131 |         assert_eq!(true, approx_equal(gr.cells[44].velocity.y, -0.2888818, 5));
132 |         assert_eq!(true, approx_equal(gr.cells[45].velocity.x, 0.0608175, 5));
133 |         assert_eq!(true, approx_equal(gr.cells[45].velocity.y, -0.2440968, 5));
134 |         assert_eq!(gr.cells[46].velocity, Vec2::new(0.0, 0.0));
135 |         assert_eq!(true, approx_equal(gr.cells[54].velocity.x, -0.0608175, 5));
136 |         assert_eq!(true, approx_equal(gr.cells[54].velocity.y, -0.2859032, 5));
137 |         assert_eq!(true, approx_equal(gr.cells[55].velocity.x, -0.0673895, 5));
138 |         assert_eq!(true, approx_equal(gr.cells[55].velocity.y, -0.2411182, 5));
139 |         assert_eq!(gr.cells[56].velocity, Vec2::new(0.0, 0.0));
140 |         assert_eq!(gr.cells[64].velocity, Vec2::new(0.0, 0.0));
141 |         assert_eq!(gr.cells[65].velocity, Vec2::new(0.0, 0.0));
142 |         assert_eq!(gr.cells[66].velocity, Vec2::new(0.0, 0.0));
143 |     }
144 | 
145 |     #[test]
146 |     // in particles_to_grid system, a single particle in freefall should update momentum (stored as scaled velocity) of surrounding cells.
147 |     fn test_particles_to_grid_iteration() {
148 |         let mut world = World::default();
149 |         let mut update_stage = SystemStage::parallel();
150 |         // manually put some mass in the grid at particle location since previous steps not run
151 |         let mut gr = Grid {
152 |             cells: vec![
153 |                 Cell {
154 |                     velocity: Vec2::ZERO,
155 |                     mass: 0.0,
156 |                 };
157 |                 TEST_GRID_WIDTH * TEST_GRID_WIDTH,
158 |             ],
159 |             width: TEST_GRID_WIDTH,
160 |             dt: TEST_DT,
161 |             current_tick: 0,
162 |             gravity_enabled: true,
163 |             gravity: TEST_GRAVITY,
164 |         };
165 |         let particle_cell_index = gr.index_at(5, 5);
166 |         gr.cells[particle_cell_index].mass = 0.25;
167 |         world.insert_resource(gr);
168 |         update_stage.add_system(particles_to_grid);
169 |         // add particle to world
170 |         let particle_id = world
171 |             .spawn()
172 |             .insert_bundle((
173 |                 Position(Vec2::new(5.0, 5.0)),
174 |                 Velocity(Vec2::new(0.0, -1.0)),
175 |                 Mass(1.06),
176 |                 RestDensity(4.),
177 |                 DynamicViscosity(0.1),
178 |                 EosStiffness(10.),
179 |                 EosPower(4.),
180 |                 AffineMomentum(Mat2::from_cols(
181 |                     Vec2::new(-0.4838, 0.01124),
182 |                     Vec2::new(-0.0248, 0.169),
183 |                 )),
184 |                 ParticleTag,
185 |             ))
186 |             .id();
187 | 
188 |         // iterate systems
189 |         update_stage.run(&mut world);
190 | 
191 |         // particle position should not change
192 |         let particle_position = world.get::<Position>(particle_id);
193 |         assert_eq!(particle_position.unwrap().0, Vec2::new(5.0, 5.0));
194 |         //// particle velocity should not change.
195 |         let particle_velocity = world.get::<Velocity>(particle_id);
196 |         assert_eq!(particle_velocity.unwrap().0, Vec2::new(0.0, -1.0));
197 |         // particle affine momentum should not change
198 |         let particle_momentum = world.get::<AffineMomentum>(particle_id);
199 |         assert_eq!(particle_momentum.unwrap().0.x_axis.x, -0.4838);
200 |         assert_eq!(particle_momentum.unwrap().0.x_axis.y, 0.01124);
201 |         assert_eq!(particle_momentum.unwrap().0.y_axis.x, -0.0248);
202 |         assert_eq!(particle_momentum.unwrap().0.y_axis.y, 0.169);
203 | 
204 |         //// get grid cells.
205 |         let gr = world.get_resource::<Grid>().unwrap();
206 | 
207 |         //// local grid cells momentum (as velocity) should be updated from particle.
208 |         assert_eq!(true, approx_equal(gr.cells[44].velocity.x, 0.042623872, 5));
209 |         assert_eq!(true, approx_equal(gr.cells[44].velocity.y, 0.097981312, 5));
210 |         assert_eq!(true, approx_equal(gr.cells[45].velocity.x, 0.044923648, 5));
211 |         assert_eq!(true, approx_equal(gr.cells[45].velocity.y, -0.100281088, 5));
212 |         assert_eq!(gr.cells[46].velocity, Vec2::new(0.0, 0.0));
213 |         assert_eq!(true, approx_equal(gr.cells[54].velocity.x, -0.044923648, 5));
214 |         assert_eq!(true, approx_equal(gr.cells[54].velocity.y, 0.100281088, 5));
215 |         assert_eq!(true, approx_equal(gr.cells[55].velocity.x, -0.042623872, 5));
216 |         assert_eq!(true, approx_equal(gr.cells[55].velocity.y, -0.097981312, 5));
217 |         assert_eq!(gr.cells[56].velocity, Vec2::new(0.0, 0.0));
218 |         assert_eq!(gr.cells[64].velocity, Vec2::new(0.0, 0.0));
219 |         assert_eq!(gr.cells[65].velocity, Vec2::new(0.0, 0.0));
220 |         assert_eq!(gr.cells[66].velocity, Vec2::new(0.0, 0.0));
221 |     }
222 | 
223 |     #[test]
224 |     // in grid_to_particles system, a couple of particles should be effected by surrounding cells.
225 |     fn test_grid_to_particles_iteration() {
226 |         let mut world = World::default();
227 |         let mut update_stage = SystemStage::parallel();
228 |         let mut gr = Grid {
229 |             cells: vec![
230 |                 Cell {
231 |                     velocity: Vec2::ZERO,
232 |                     mass: 0.0,
233 |                 };
234 |                 TEST_GRID_WIDTH * TEST_GRID_WIDTH,
235 |             ],
236 |             width: TEST_GRID_WIDTH,
237 |             dt: TEST_DT,
238 |             current_tick: 0,
239 |             gravity_enabled: true,
240 |             gravity: TEST_GRAVITY,
241 |         };
242 | 
243 |         let particle_1_id = world
244 |             .spawn()
245 |             .insert_bundle((
246 |                 Position(Vec2::new(5.2, 5.3)),
247 |                 Velocity(Vec2::new(3.3, 3.0)),
248 |                 Mass(1.06),
249 |                 AffineMomentum(Mat2::from_cols(
250 |                     Vec2::new(-0.4838, 0.01124),
251 |                     Vec2::new(-0.0248, 0.169),
252 |                 )),
253 |                 ParticleTag,
254 |             ))
255 |             .id();
256 | 
257 |         let particle_2_id = world
258 |             .spawn()
259 |             .insert_bundle((
260 |                 Position(Vec2::new(6.6, 5.9)),
261 |                 Velocity(Vec2::new(1.2, -1.0)),
262 |                 Mass(1.23),
263 |                 AffineMomentum(Mat2::from_cols(
264 |                     Vec2::new(-0.4838, 0.01124),
265 |                     Vec2::new(-0.0248, 0.169),
266 |                 )),
267 |                 ParticleTag,
268 |             ))
269 |             .id();
270 | 
271 |         let particle_1_cell_index = gr.index_at(5, 5);
272 |         let particle_2_cell_index = gr.index_at(6, 5);
273 | 
274 |         // manually put some velocity + mass in the grid at particle location since other systems did not run
275 |         gr.cells[particle_1_cell_index].velocity = Vec2::new(1.0, 1.0);
276 |         gr.cells[particle_1_cell_index].mass = 0.25;
277 | 
278 |         gr.cells[particle_2_cell_index].velocity = Vec2::new(2.0, 2.0);
279 |         gr.cells[particle_2_cell_index].mass = 0.25;
280 | 
281 |         world.insert_resource(gr);
282 |         update_stage.add_system(grid_to_particles);
283 | 
284 |         // iterate systems
285 |         update_stage.run(&mut world);
286 | 
287 |         // check particles
288 |         let particle_1_position = world.get::<Position>(particle_1_id);
289 |         let particle_1_velocity = world.get::<Velocity>(particle_1_id);
290 |         let particle_1_mass = world.get::<Mass>(particle_1_id);
291 |         let particle_1_affine_momentum = world.get::<AffineMomentum>(particle_1_id);
292 |         let particle_2_position = world.get::<Position>(particle_2_id);
293 |         let particle_2_velocity = world.get::<Velocity>(particle_2_id);
294 |         let particle_2_mass = world.get::<Mass>(particle_2_id);
295 |         let particle_2_affine_momentum = world.get::<AffineMomentum>(particle_2_id);
296 | 
297 |         assert_eq!(
298 |             true,
299 |             approx_equal(particle_1_position.unwrap().0.x, 5.2497, 3)
300 |         );
301 |         assert_eq!(
302 |             true,
303 |             approx_equal(particle_1_position.unwrap().0.y, 5.3496, 3)
304 |         );
305 |         assert_eq!(
306 |             true,
307 |             approx_equal(particle_1_velocity.unwrap().0.x, 0.497, 3)
308 |         );
309 |         assert_eq!(
310 |             true,
311 |             approx_equal(particle_1_velocity.unwrap().0.y, 0.497, 3)
312 |         );
313 |         assert_eq!(particle_1_mass.unwrap().0, 1.06);
314 |         assert_eq!(
315 |             true,
316 |             approx_equal(particle_1_affine_momentum.unwrap().0.x_axis.x, 0.71, 3)
317 |         );
318 |         assert_eq!(
319 |             true,
320 |             approx_equal(particle_1_affine_momentum.unwrap().0.x_axis.y, 0.71, 3)
321 |         );
322 |         assert_eq!(
323 |             true,
324 |             approx_equal(particle_1_affine_momentum.unwrap().0.y_axis.x, 0.3976, 3)
325 |         );
326 |         assert_eq!(
327 |             true,
328 |             approx_equal(particle_1_affine_momentum.unwrap().0.y_axis.y, 0.3976, 3)
329 |         );
330 | 
331 |         assert_eq!(
332 |             true,
333 |             approx_equal(particle_2_position.unwrap().0.x, 6.692, 3)
334 |         );
335 |         assert_eq!(
336 |             true,
337 |             approx_equal(particle_2_position.unwrap().0.y, 5.992, 3)
338 |         );
339 |         assert_eq!(
340 |             true,
341 |             approx_equal(particle_2_velocity.unwrap().0.x, -0.69135, 3)
342 |         );
343 |         assert_eq!(
344 |             true,
345 |             approx_equal(particle_2_velocity.unwrap().0.y, 0.00704, 3)
346 |         );
347 |         assert_eq!(particle_2_mass.unwrap().0, 1.23);
348 |         assert_eq!(
349 |             true,
350 |             approx_equal(particle_2_affine_momentum.unwrap().0.x_axis.x, -0.557, 3)
351 |         );
352 |         assert_eq!(
353 |             true,
354 |             approx_equal(particle_2_affine_momentum.unwrap().0.x_axis.y, -0.557, 3)
355 |         );
356 |         assert_eq!(
357 |             true,
358 |             approx_equal(particle_2_affine_momentum.unwrap().0.y_axis.x, -1.47264, 3)
359 |         );
360 |         assert_eq!(
361 |             true,
362 |             approx_equal(particle_2_affine_momentum.unwrap().0.y_axis.y, -1.47264, 3)
363 |         );
364 |     }
365 | 
366 |     #[test]
367 |     // reset_grid should zero out the cells
368 |     fn test_reset_grid() {
369 |         let mut gr = Grid {
370 |             cells: vec![
371 |                 Cell {
372 |                     velocity: Vec2::ZERO,
373 |                     mass: 0.0,
374 |                 };
375 |                 TEST_GRID_WIDTH * TEST_GRID_WIDTH,
376 |             ],
377 |             width: TEST_GRID_WIDTH,
378 |             dt: TEST_DT,
379 |             current_tick: 0,
380 |             gravity_enabled: true,
381 |             gravity: TEST_GRAVITY,
382 |         };
383 |         gr.cells[7].mass = 0.25;
384 |         gr.cells[7].velocity = Vec2::new(1.2, 2.3);
385 | 
386 |         gr.reset();
387 | 
388 |         assert_eq!(gr.cells[7].mass, 0.0);
389 |         assert_eq!(gr.cells[7].velocity.x, 0.0);
390 |         assert_eq!(gr.cells[7].velocity.y, 0.0);
391 |     }
392 | 
393 |     #[test]
394 |     // update_grid should adjust particle velocity and apply boundary conditions
395 |     fn test_update_grid() {
396 |         let mut gr = Grid {
397 |             cells: vec![
398 |                 Cell {
399 |                     velocity: Vec2::ZERO,
400 |                     mass: 0.0,
401 |                 };
402 |                 TEST_GRID_WIDTH * TEST_GRID_WIDTH,
403 |             ],
404 |             width: TEST_GRID_WIDTH,
405 |             dt: TEST_DT,
406 |             current_tick: 0,
407 |             gravity_enabled: true,
408 |             gravity: TEST_GRAVITY,
409 |         };
410 | 
411 |         // add border cell with mass and velocity
412 |         let border_cell_index = gr.index_at(3, 0);
413 |         gr.cells[border_cell_index] = Cell {
414 |             velocity: Vec2::new(2.2, -2.4),
415 |             mass: 1.17171717,
416 |         };
417 | 
418 |         // add middle cell with mass and velocity
419 |         let middle_cell_index = gr.index_at(5, 5);
420 |         gr.cells[middle_cell_index] = Cell {
421 |             velocity: Vec2::new(3.7333, -1.111),
422 |             mass: 3.333,
423 |         };
424 | 
425 |         // apply grid update
426 |         gr.update();
427 | 
428 |         // border cell should have updated velocity and -y velocity cancelled
429 |         assert_eq!(
430 |             true,
431 |             approx_equal(gr.cells[border_cell_index].velocity.x, 1.8757, 5)
432 |         );
433 |         assert_eq!(
434 |             true,
435 |             approx_equal(gr.cells[border_cell_index].velocity.y, 0.0, 5)
436 |         );
437 |         assert_eq!(gr.cells[border_cell_index].mass, 1.17171717);
438 | 
439 |         // middle cell should have updated velocity
440 |         assert_eq!(
441 |             true,
442 |             approx_equal(gr.cells[middle_cell_index].velocity.x, 1.120102, 5)
443 |         );
444 |         assert_eq!(
445 |             true,
446 |             approx_equal(gr.cells[middle_cell_index].velocity.y, -0.36333, 5)
447 |         );
448 |         assert_eq!(gr.cells[middle_cell_index].mass, 3.333);
449 |     }
450 | }
451 | 
452 | fn mat2_equal(a: Mat2, b: Mat2, dp: u8) -> bool {
453 |     vec2_equal(a.x_axis, b.x_axis, dp) && vec2_equal(a.y_axis, b.y_axis, dp)
454 | }
455 | 
456 | fn vec2_equal(a: Vec2, b: Vec2, dp: u8) -> bool {
457 |     approx_equal(a.x, b.x, dp) && approx_equal(a.y, b.y, dp)
458 | }
459 | 
460 | fn approx_equal(a: f32, b: f32, dp: u8) -> bool {
461 |     let p = 10f32.powi(-(dp as i32));
462 |     (a - b).abs() < p
463 | }
464 | 


--------------------------------------------------------------------------------
/src/world.rs:
--------------------------------------------------------------------------------
 1 | use super::defaults::*;
 2 | 
 3 | #[derive(Copy, Clone)]
 4 | pub(super) struct WorldState {
 5 |     pub(super) dt: f32,
 6 |     pub(super) gravity: f32,
 7 |     pub(super) gravity_enabled: bool,
 8 |     pub(super) current_tick: usize,
 9 | }
10 | 
11 | impl WorldState {
12 |     pub(super) fn toggle_gravity(&mut self) {
13 |         self.gravity_enabled = !self.gravity_enabled;
14 |     }
15 | 
16 |     pub(super) fn default() -> WorldState {
17 |         WorldState {
18 |             dt: DEFAULT_DT,
19 |             gravity: DEFAULT_GRAVITY,
20 |             gravity_enabled: true,
21 |             current_tick: 0,
22 |         }
23 |     }
24 | 
25 |     pub(super) fn update(&mut self) {
26 |         self.current_tick += 1;
27 |     }
28 | }
29 | 


--------------------------------------------------------------------------------
/src/zoom.rs:
--------------------------------------------------------------------------------
 1 | // not needed until resizeable.
 2 | //fn set_zoom_from_window_size(
 3 | //    camera: Query<OrthographicCameraBundle>,
 4 | //    resize_event: Res<Events<WindowResized>>,
 5 | //) {
 6 | //    let mut reader = resize_event.get_reader();
 7 | //    // todo calculate zoom and apply it to world.
 8 | //
 9 | //    // zoom == window_width / grid_width
10 | //    let wnd = wnds.get_primary().unwrap();
11 | //    let size = Vec2::new(wnd.width() as f32, wnd.height() as f32);
12 | //    let scale = wnd.width() / grid.width as f32; // todo in response to events.
13 | //
14 | //    cb.transform = Transform::from_translation(Vec3::new(
15 | //        size.x / (scale * 2.0),
16 | //        size.y / (scale * 2.0),
17 | //        0.0,
18 | //    ));
19 | //    cb.orthographic_projection.scale = 1.0 / scale;
20 | //    commands.spawn_bundle(cb);
21 | //}
22 | 


--------------------------------------------------------------------------------