├── .gitignore ├── Assets ├── Grass & dead leafs 01.meta ├── Grass & dead leafs 01 │ ├── Grass & dead leafs pattern 01.mat │ ├── Grass & dead leafs pattern 01.mat.meta │ ├── Materials.meta │ ├── Materials │ │ ├── diffuse.mat │ │ ├── diffuse.mat.meta │ │ ├── preview.mat │ │ └── preview.mat.meta │ ├── diffuse.tga │ ├── diffuse.tga.meta │ ├── normal.tga │ ├── normal.tga.meta │ ├── preview.jpg │ └── preview.jpg.meta ├── Mat.meta ├── Mat │ ├── GrassMat.mat │ └── GrassMat.mat.meta ├── Scene.meta ├── Scene │ ├── demo.unity │ └── demo.unity.meta ├── Script.meta ├── Script │ ├── GrassSpanner.cs │ └── GrassSpanner.cs.meta ├── Shader.meta ├── Shader │ ├── GrassGeometryShader.shader │ └── GrassGeometryShader.shader.meta ├── Texture.meta ├── Texture │ ├── Heightmap.png │ ├── Heightmap.png.meta │ ├── grassBlade.png │ ├── grassBlade.png.meta │ ├── grassBladeAlpha.png │ └── grassBladeAlpha.png.meta ├── skyb2.meta └── skyb2 │ ├── back.psd │ ├── back.psd.meta │ ├── bot.psd │ ├── bot.psd.meta │ ├── front.psd │ ├── front.psd.meta │ ├── l.psd │ ├── l.psd.meta │ ├── r.psd │ ├── r.psd.meta │ ├── sky,startday.mat │ ├── sky,startday.mat.meta │ ├── up.psd │ └── up.psd.meta ├── LICENSE ├── ProjectSettings ├── AudioManager.asset ├── ClusterInputManager.asset ├── DynamicsManager.asset ├── EditorBuildSettings.asset ├── EditorSettings.asset ├── GraphicsSettings.asset ├── InputManager.asset ├── NavMeshAreas.asset ├── NetworkManager.asset ├── Physics2DSettings.asset ├── ProjectSettings.asset ├── ProjectVersion.txt ├── QualitySettings.asset ├── TagManager.asset ├── TimeManager.asset └── UnityConnectSettings.asset └── README.md /.gitignore: -------------------------------------------------------------------------------- 1 | /[Ll]ibrary/ 2 | /[Tt]emp/ 3 | /[Oo]bj/ 4 | /[Bb]uild/ 5 | /[Bb]uilds/ 6 | /Assets/AssetStoreTools* 7 | 8 | # Visual Studio 2015 cache directory 9 | /.vs/ 10 | 11 | # Autogenerated VS/MD/Consulo solution and project files 12 | ExportedObj/ 13 | .consulo/ 14 | *.csproj 15 | 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f20dd0874f3d4c243b1296e2cb2d85da 3 | timeCreated: 1506432286 4 | licenseType: Free 5 | DefaultImporter: 6 | userData: 7 | assetBundleName: 8 | assetBundleVariant: 9 | -------------------------------------------------------------------------------- /Assets/Script.meta: -------------------------------------------------------------------------------- 1 | fileFormatVersion: 2 2 | guid: e4e747b7aad0bf14db2081f75920a90f 3 | folderAsset: yes 4 | timeCreated: 1506432300 5 | licenseType: Free 6 | DefaultImporter: 7 | userData: 8 | assetBundleName: 9 | assetBundleVariant: 10 | -------------------------------------------------------------------------------- /Assets/Script/GrassSpanner.cs: -------------------------------------------------------------------------------- 1 | // 2 | // created by jiadong chen 3 | // http://www.chenjd.me 4 | // 5 | using UnityEngine; 6 | using System.Collections.Generic; 7 | 8 | using Random = System.Random; 9 | 10 | public class GrassSpanner : MonoBehaviour { 11 | 12 | 13 | #region 字段 14 | 15 | public Texture2D heightMap; 16 | public float terrainHeight; 17 | public int terrainSize = 250; 18 | public Material terrainMat; 19 | public Material grassMat; 20 | private List verts = new List(); 21 | private Random random; 22 | 23 | #endregion 24 | 25 | void Start() 26 | { 27 | this.random = new Random(); 28 | GenerateTerrain(); 29 | GenerateField(30, 50); 30 | } 31 | 32 | 33 | /// 34 | /// 生成地形 35 | /// 36 | private void GenerateTerrain() 37 | { 38 | List verts = new List(); 39 | List tris = new List(); 40 | 41 | for (int i = 0; i < this.terrainSize; i++) 42 | { 43 | for (int j = 0; j < this.terrainSize; j++) 44 | { 45 | verts.Add(new Vector3(i, heightMap.GetPixel(i, j).grayscale * this.terrainHeight , j)); 46 | if (i == 0 || j == 0) 47 | continue; 48 | tris.Add(terrainSize * i + j); 49 | tris.Add(terrainSize * i + j - 1); 50 | tris.Add(terrainSize * (i - 1) + j - 1); 51 | tris.Add(terrainSize * (i - 1) + j - 1); 52 | tris.Add(terrainSize * (i - 1) + j); 53 | tris.Add(terrainSize * i + j); 54 | } 55 | } 56 | 57 | Vector2[] uvs = new Vector2[verts.Count]; 58 | 59 | for (var i = 0; i < uvs.Length; i++) 60 | { 61 | uvs[i] = new Vector2(verts[i].x, verts[i].z); 62 | } 63 | 64 | GameObject plane = new GameObject("groundPlane"); 65 | plane.AddComponent(); 66 | MeshRenderer renderer = plane.AddComponent(); 67 | renderer.sharedMaterial = terrainMat; 68 | 69 | Mesh groundMesh = new Mesh(); 70 | groundMesh.vertices = verts.ToArray(); 71 | groundMesh.uv = uvs; 72 | groundMesh.triangles = tris.ToArray(); 73 | groundMesh.RecalculateNormals(); 74 | plane.GetComponent().mesh = groundMesh; 75 | 76 | this.verts.Clear(); 77 | } 78 | 79 | /// 80 | /// 生成草地 81 | /// 82 | /// 83 | /// 84 | private void GenerateField(int grassPatchRowCount, int grassCountPerPatch) 85 | { 86 | List indices = new List(); 87 | for (int i = 0; i < 65000; i++) 88 | { 89 | indices.Add(i); 90 | } 91 | 92 | Vector3 startPosition = new Vector3(0, 0, 0); 93 | Vector3 patchSize = new Vector3(terrainSize / grassPatchRowCount, 0, terrainSize / grassPatchRowCount); 94 | 95 | for (int x = 0; x < grassPatchRowCount; x++) 96 | { 97 | for (int y = 0; y < grassPatchRowCount; y++) 98 | { 99 | this.GenerateGrass(startPosition, patchSize, grassPatchRowCount); 100 | startPosition.x += patchSize.x; 101 | } 102 | 103 | startPosition.x = 0; 104 | startPosition.z += patchSize.z; 105 | } 106 | 107 | GameObject grassLayer; 108 | MeshFilter mf; 109 | MeshRenderer renderer; 110 | Mesh m; 111 | 112 | while (verts.Count > 65000) 113 | { 114 | m = new Mesh(); 115 | m.vertices = verts.GetRange(0, 65000).ToArray(); 116 | m.SetIndices(indices.ToArray(), MeshTopology.Points, 0); 117 | 118 | grassLayer = new GameObject("grassLayer"); 119 | mf = grassLayer.AddComponent(); 120 | renderer = grassLayer.AddComponent(); 121 | renderer.sharedMaterial = grassMat; 122 | mf.mesh = m; 123 | verts.RemoveRange(0, 65000); 124 | } 125 | 126 | m = new Mesh(); 127 | m.vertices = verts.ToArray(); 128 | m.SetIndices(indices.GetRange(0, verts.Count).ToArray(), MeshTopology.Points, 0); 129 | grassLayer = new GameObject("grassLayer"); 130 | mf = grassLayer.AddComponent(); 131 | renderer = grassLayer.AddComponent(); 132 | renderer.sharedMaterial = grassMat; 133 | mf.mesh = m; 134 | 135 | return; 136 | } 137 | 138 | private void GenerateGrass(Vector3 startPosition, Vector3 patchSize, int grassCountPerPatch) 139 | { 140 | for (var i = 0; i < grassCountPerPatch; i++) 141 | { 142 | var randomizedZDistance = (float)this.random.NextDouble() * patchSize.z; 143 | var randomizedXDistance = (float)this.random.NextDouble() * patchSize.x; 144 | 145 | int indexX = (int)((startPosition.x + randomizedXDistance)); 146 | int indexZ = (int)((startPosition.z + randomizedZDistance)); 147 | 148 | if (indexX >= terrainSize) 149 | { 150 | indexX = (int)terrainSize - 1; 151 | } 152 | 153 | if (indexZ >= terrainSize) 154 | { 155 | indexZ = (int)terrainSize - 1; 156 | } 157 | 158 | var currentPosition = new Vector3(startPosition.x + (randomizedXDistance), heightMap.GetPixel(indexX, indexZ).grayscale * (terrainHeight + 1), startPosition.z + randomizedZDistance); 159 | this.verts.Add(currentPosition); 160 | } 161 | } 162 | 163 | } 164 | -------------------------------------------------------------------------------- /Assets/Script/GrassSpanner.cs.meta: -------------------------------------------------------------------------------- 1 | fileFormatVersion: 2 2 | guid: 3ae3065a92d39f346909f6f07666e946 3 | timeCreated: 1506432378 4 | licenseType: Free 5 | MonoImporter: 6 | serializedVersion: 2 7 | defaultReferences: [] 8 | executionOrder: 0 9 | icon: {instanceID: 0} 10 | userData: 11 | assetBundleName: 12 | assetBundleVariant: 13 | -------------------------------------------------------------------------------- /Assets/Shader.meta: -------------------------------------------------------------------------------- 1 | fileFormatVersion: 2 2 | guid: 97f431d72ac709742bc13d1c4b13e61b 3 | folderAsset: yes 4 | timeCreated: 1506438499 5 | licenseType: Free 6 | DefaultImporter: 7 | userData: 8 | assetBundleName: 9 | assetBundleVariant: 10 | -------------------------------------------------------------------------------- /Assets/Shader/GrassGeometryShader.shader: -------------------------------------------------------------------------------- 1 | Shader "chenjd/Grass" { 2 | Properties{ 3 | 4 | _MainTex("Albedo (RGB)", 2D) = "white" {} 5 | _AlphaTex("Alpha (A)", 2D) = "white" {} 6 | _Height("Grass Height", float) = 3 7 | _Width("Grass Width", range(0, 0.1)) = 0.05 8 | 9 | } 10 | SubShader{ 11 | Cull off 12 | Tags{ "Queue" = "AlphaTest" "RenderType" = "TransparentCutout" "IgnoreProjector" = "True" } 13 | 14 | 15 | Pass 16 | { 17 | 18 | Cull OFF 19 | Tags{ "LightMode" = "ForwardBase" } 20 | AlphaToMask On 21 | 22 | 23 | CGPROGRAM 24 | 25 | #include "UnityCG.cginc" 26 | #pragma vertex vert 27 | #pragma fragment frag 28 | #pragma geometry geom 29 | #include "UnityLightingCommon.cginc" // 用来处理光照的一些效果 30 | 31 | #pragma target 4.0 32 | 33 | sampler2D _MainTex; 34 | sampler2D _AlphaTex; 35 | 36 | float _Height;//草的高度 37 | float _Width;//草的宽度 38 | struct v2g 39 | { 40 | float4 pos : SV_POSITION; 41 | float3 norm : NORMAL; 42 | float2 uv : TEXCOORD0; 43 | }; 44 | 45 | struct g2f 46 | { 47 | float4 pos : SV_POSITION; 48 | float3 norm : NORMAL; 49 | float2 uv : TEXCOORD0; 50 | }; 51 | 52 | 53 | static const float oscillateDelta = 0.05; 54 | 55 | 56 | v2g vert(appdata_full v) 57 | { 58 | v2g o; 59 | o.pos = v.vertex; 60 | o.norm = v.normal; 61 | o.uv = v.texcoord; 62 | 63 | return o; 64 | } 65 | 66 | g2f createGSOut() { 67 | g2f output; 68 | 69 | output.pos = float4(0, 0, 0, 0); 70 | output.norm = float3(0, 0, 0); 71 | output.uv= float2(0, 0); 72 | 73 | return output; 74 | } 75 | 76 | 77 | [maxvertexcount(30)] 78 | void geom(point v2g points[1], inout TriangleStream triStream) 79 | { 80 | 81 | float4 root = points[0].pos; 82 | 83 | const int vertexCount = 12; 84 | 85 | float random = sin(UNITY_HALF_PI * frac(root.x) + UNITY_HALF_PI * frac(root.z)); 86 | 87 | 88 | _Width = _Width + (random / 50); 89 | _Height = _Height +(random / 5); 90 | 91 | 92 | g2f v[vertexCount] = { 93 | createGSOut(), createGSOut(), createGSOut(), createGSOut(), 94 | createGSOut(), createGSOut(), createGSOut(), createGSOut(), 95 | createGSOut(), createGSOut(), createGSOut(), createGSOut() 96 | }; 97 | 98 | //处理纹理坐标 99 | float currentV = 0; 100 | float offsetV = 1.f /((vertexCount / 2) - 1); 101 | 102 | //处理当前的高度 103 | float currentHeightOffset = 0; 104 | float currentVertexHeight = 0; 105 | 106 | //风的影响系数 107 | float windCoEff = 0; 108 | 109 | for (int i = 0; i < vertexCount; i++) 110 | { 111 | v[i].norm = float3(0, 0, 1); 112 | 113 | if (fmod(i , 2) == 0) 114 | { 115 | v[i].pos = float4(root.x - _Width , root.y + currentVertexHeight, root.z, 1); 116 | v[i].uv = float2(0, currentV); 117 | } 118 | else 119 | { 120 | v[i].pos = float4(root.x + _Width , root.y + currentVertexHeight, root.z, 1); 121 | v[i].uv = float2(1, currentV); 122 | 123 | currentV += offsetV; 124 | currentVertexHeight = currentV * _Height; 125 | } 126 | 127 | float2 wind = float2(sin(_Time.x * UNITY_PI * 5), sin(_Time.x * UNITY_PI * 5)); 128 | wind.x += (sin(_Time.x + root.x / 25) + sin((_Time.x + root.x / 15) + 50)) * 0.5; 129 | wind.y += cos(_Time.x + root.z / 80); 130 | wind *= lerp(0.7, 1.0, 1.0 - random); 131 | 132 | float oscillationStrength = 2.5f; 133 | float sinSkewCoeff = random; 134 | float lerpCoeff = (sin(oscillationStrength * _Time.x + sinSkewCoeff) + 1.0) / 2; 135 | float2 leftWindBound = wind * (1.0 - oscillateDelta); 136 | float2 rightWindBound = wind * (1.0 + oscillateDelta); 137 | 138 | wind = lerp(leftWindBound, rightWindBound, lerpCoeff); 139 | 140 | float randomAngle = lerp(-UNITY_PI, UNITY_PI, random); 141 | float randomMagnitude = lerp(0, 1., random); 142 | float2 randomWindDir = float2(sin(randomAngle), cos(randomAngle)); 143 | wind += randomWindDir * randomMagnitude; 144 | 145 | float windForce = length(wind); 146 | 147 | v[i].pos.xz += wind.xy * windCoEff; 148 | v[i].pos.y -= windForce * windCoEff * 0.8; 149 | 150 | v[i].pos = UnityObjectToClipPos(v[i].pos); 151 | 152 | if (fmod(i, 2) == 1) { 153 | 154 | windCoEff += offsetV; 155 | } 156 | 157 | } 158 | 159 | for (int p = 0; p < (vertexCount - 2); p++) { 160 | triStream.Append(v[p]); 161 | triStream.Append(v[p + 2]); 162 | triStream.Append(v[p + 1]); 163 | } 164 | } 165 | 166 | 167 | half4 frag(g2f IN) : COLOR 168 | { 169 | fixed4 color = tex2D(_MainTex, IN.uv); 170 | fixed4 alpha = tex2D(_AlphaTex, IN.uv); 171 | 172 | half3 worldNormal = UnityObjectToWorldNormal(IN.norm); 173 | 174 | //ads 175 | fixed3 light; 176 | 177 | //ambient 178 | fixed3 ambient = ShadeSH9(half4(worldNormal, 1)); 179 | 180 | //diffuse 181 | fixed3 diffuseLight = saturate(dot(worldNormal, UnityWorldSpaceLightDir(IN.pos))) * _LightColor0; 182 | 183 | //specular Blinn-Phong 184 | fixed3 halfVector = 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be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /ProjectSettings/AudioManager.asset: -------------------------------------------------------------------------------- 1 | %YAML 1.1 2 | %TAG !u! tag:unity3d.com,2011: 3 | --- !u!11 &1 4 | AudioManager: 5 | m_ObjectHideFlags: 0 6 | m_Volume: 1 7 | Rolloff Scale: 1 8 | Doppler Factor: 1 9 | Default Speaker Mode: 2 10 | m_SampleRate: 0 11 | m_DSPBufferSize: 0 12 | m_VirtualVoiceCount: 512 13 | m_RealVoiceCount: 32 14 | m_SpatializerPlugin: 15 | m_AmbisonicDecoderPlugin: 16 | m_DisableAudio: 0 17 | m_VirtualizeEffects: 1 18 | -------------------------------------------------------------------------------- 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m_EnabledPlatforms: 4294967295 29 | m_IosGameId: 30 | m_AndroidGameId: 31 | m_GameIds: {} 32 | m_GameId: 33 | PerformanceReportingSettings: 34 | m_Enabled: 0 35 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Realistic-Real-Time-Grass-Rendering-With-Unity 2 | ![GitHub](https://img.shields.io/github/license/chenjd/Realistic-Real-Time-Grass-Rendering-With-Unity) 3 | ![](https://img.shields.io/badge/platform-win--64-brightgreen) 4 | ![](https://img.shields.io/badge/unity-5.6%2B-brightgreen) 5 | ### Description 6 | Realistic Real Time Grass Rendering With Unity. 7 | ![](http://images2017.cnblogs.com/blog/686199/201709/686199-20170924102024259-1948824515.jpg) 8 | Using the Geometry Shader to generate millions of grass on GPU. 9 | ![](http://images2017.cnblogs.com/blog/686199/201709/686199-20170924102841103-1853404544.png) 10 | 11 | ref：Edward Lee 12 | 13 | ### Article(Chinese) 14 | [利用GPU实现无尽草地的实时渲染](http://www.cnblogs.com/murongxiaopifu/p/7572703.html) 15 | 16 | ### Article(English) 17 | [Using the Geometry Shader In Unity To Generate Countless Of Grass On GPU](https://medium.com/chenjd-xyz/using-the-geometry-shader-in-unity-to-generate-countless-of-grass-on-gpu-4ca6d78b3de6) 18 | 19 | ### Requirement 20 | Unity 5.6+ 21 | 22 | ## Update 23 | Unity 2017.3 supports 32-bit index buffer. 24 | 25 | ### Ref 26 | 【1】[《Chapter 7. Rendering Countless Blades of Waving Grass》](https://developer.nvidia.com/gpugems/GPUGems/gpugems_ch07.html) 27 | 28 | 【2】[《Rendering Grass Terrains in 29 | Real-Time with Dynamic Lighting》](http://kevinboulanger.net/publications/grassSiggraph2006ppt.pdf) 30 | 31 | 【3】[《REALISTIC REAL-TIME GRASS RENDERING》](http://illogictree.com/blog/projects/) 32 | 33 | 【4】[《Programming Guide for Direct3D 11》](https://msdn.microsoft.com/en-us/library/windows/desktop/mt787170(v=vs.85).aspx) 34 | --------------------------------------------------------------------------------