├── Nebula.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   └── contents.xcworkspacedata
    └── xcuserdata
    │   └── simongladman.xcuserdatad
    │       └── xcschemes
    │           ├── Nebula.xcscheme
    │           └── xcschememanagement.plist
├── Nebula
    ├── AppDelegate.swift
    ├── Assets.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── Base.lproj
    │   ├── LaunchScreen.storyboard
    │   └── Main.storyboard
    ├── IMG_0195.jpg
    ├── Info.plist
    ├── NebulaShader.cikernel
    └── ViewController.swift
└── README.md


/Nebula.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
  1 | // !$*UTF8*$!
  2 | {
  3 | 	archiveVersion = 1;
  4 | 	classes = {
  5 | 	};
  6 | 	objectVersion = 46;
  7 | 	objects = {
  8 | 
  9 | /* Begin PBXBuildFile section */
 10 | 		3E4A19491C8F1948006032BC /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3E4A19481C8F1948006032BC /* AppDelegate.swift */; };
 11 | 		3E4A194B1C8F1948006032BC /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3E4A194A1C8F1948006032BC /* ViewController.swift */; };
 12 | 		3E4A194E1C8F1948006032BC /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 3E4A194C1C8F1948006032BC /* Main.storyboard */; };
 13 | 		3E4A19501C8F1948006032BC /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 3E4A194F1C8F1948006032BC /* Assets.xcassets */; };
 14 | 		3E4A19531C8F1948006032BC /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 3E4A19511C8F1948006032BC /* LaunchScreen.storyboard */; };
 15 | 		3E4A195B1C8F1972006032BC /* NebulaShader.cikernel in Resources */ = {isa = PBXBuildFile; fileRef = 3E4A195A1C8F1972006032BC /* NebulaShader.cikernel */; };
 16 | 		3E4A195D1C8F1B9E006032BC /* IMG_0195.jpg in Resources */ = {isa = PBXBuildFile; fileRef = 3E4A195C1C8F1B9E006032BC /* IMG_0195.jpg */; };
 17 | /* End PBXBuildFile section */
 18 | 
 19 | /* Begin PBXFileReference section */
 20 | 		3E4A19451C8F1948006032BC /* Nebula.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Nebula.app; sourceTree = BUILT_PRODUCTS_DIR; };
 21 | 		3E4A19481C8F1948006032BC /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 22 | 		3E4A194A1C8F1948006032BC /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
 23 | 		3E4A194D1C8F1948006032BC /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
 24 | 		3E4A194F1C8F1948006032BC /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 25 | 		3E4A19521C8F1948006032BC /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 26 | 		3E4A19541C8F1948006032BC /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 27 | 		3E4A195A1C8F1972006032BC /* NebulaShader.cikernel */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = NebulaShader.cikernel; sourceTree = "<group>"; };
 28 | 		3E4A195C1C8F1B9E006032BC /* IMG_0195.jpg */ = {isa = PBXFileReference; lastKnownFileType = image.jpeg; path = IMG_0195.jpg; sourceTree = "<group>"; };
 29 | /* End PBXFileReference section */
 30 | 
 31 | /* Begin PBXFrameworksBuildPhase section */
 32 | 		3E4A19421C8F1948006032BC /* Frameworks */ = {
 33 | 			isa = PBXFrameworksBuildPhase;
 34 | 			buildActionMask = 2147483647;
 35 | 			files = (
 36 | 			);
 37 | 			runOnlyForDeploymentPostprocessing = 0;
 38 | 		};
 39 | /* End PBXFrameworksBuildPhase section */
 40 | 
 41 | /* Begin PBXGroup section */
 42 | 		3E4A193C1C8F1948006032BC = {
 43 | 			isa = PBXGroup;
 44 | 			children = (
 45 | 				3E4A19471C8F1948006032BC /* Nebula */,
 46 | 				3E4A19461C8F1948006032BC /* Products */,
 47 | 			);
 48 | 			sourceTree = "<group>";
 49 | 		};
 50 | 		3E4A19461C8F1948006032BC /* Products */ = {
 51 | 			isa = PBXGroup;
 52 | 			children = (
 53 | 				3E4A19451C8F1948006032BC /* Nebula.app */,
 54 | 			);
 55 | 			name = Products;
 56 | 			sourceTree = "<group>";
 57 | 		};
 58 | 		3E4A19471C8F1948006032BC /* Nebula */ = {
 59 | 			isa = PBXGroup;
 60 | 			children = (
 61 | 				3E4A19481C8F1948006032BC /* AppDelegate.swift */,
 62 | 				3E4A194A1C8F1948006032BC /* ViewController.swift */,
 63 | 				3E4A195C1C8F1B9E006032BC /* IMG_0195.jpg */,
 64 | 				3E4A194C1C8F1948006032BC /* Main.storyboard */,
 65 | 				3E4A194F1C8F1948006032BC /* Assets.xcassets */,
 66 | 				3E4A19511C8F1948006032BC /* LaunchScreen.storyboard */,
 67 | 				3E4A19541C8F1948006032BC /* Info.plist */,
 68 | 				3E4A195A1C8F1972006032BC /* NebulaShader.cikernel */,
 69 | 			);
 70 | 			path = Nebula;
 71 | 			sourceTree = "<group>";
 72 | 		};
 73 | /* End PBXGroup section */
 74 | 
 75 | /* Begin PBXNativeTarget section */
 76 | 		3E4A19441C8F1948006032BC /* Nebula */ = {
 77 | 			isa = PBXNativeTarget;
 78 | 			buildConfigurationList = 3E4A19571C8F1948006032BC /* Build configuration list for PBXNativeTarget "Nebula" */;
 79 | 			buildPhases = (
 80 | 				3E4A19411C8F1948006032BC /* Sources */,
 81 | 				3E4A19421C8F1948006032BC /* Frameworks */,
 82 | 				3E4A19431C8F1948006032BC /* Resources */,
 83 | 			);
 84 | 			buildRules = (
 85 | 			);
 86 | 			dependencies = (
 87 | 			);
 88 | 			name = Nebula;
 89 | 			productName = Nebula;
 90 | 			productReference = 3E4A19451C8F1948006032BC /* Nebula.app */;
 91 | 			productType = "com.apple.product-type.application";
 92 | 		};
 93 | /* End PBXNativeTarget section */
 94 | 
 95 | /* Begin PBXProject section */
 96 | 		3E4A193D1C8F1948006032BC /* Project object */ = {
 97 | 			isa = PBXProject;
 98 | 			attributes = {
 99 | 				LastSwiftUpdateCheck = 0720;
100 | 				LastUpgradeCheck = 0720;
101 | 				ORGANIZATIONNAME = "Simon Gladman";
102 | 				TargetAttributes = {
103 | 					3E4A19441C8F1948006032BC = {
104 | 						CreatedOnToolsVersion = 7.2.1;
105 | 					};
106 | 				};
107 | 			};
108 | 			buildConfigurationList = 3E4A19401C8F1948006032BC /* Build configuration list for PBXProject "Nebula" */;
109 | 			compatibilityVersion = "Xcode 3.2";
110 | 			developmentRegion = English;
111 | 			hasScannedForEncodings = 0;
112 | 			knownRegions = (
113 | 				en,
114 | 				Base,
115 | 			);
116 | 			mainGroup = 3E4A193C1C8F1948006032BC;
117 | 			productRefGroup = 3E4A19461C8F1948006032BC /* Products */;
118 | 			projectDirPath = "";
119 | 			projectRoot = "";
120 | 			targets = (
121 | 				3E4A19441C8F1948006032BC /* Nebula */,
122 | 			);
123 | 		};
124 | /* End PBXProject section */
125 | 
126 | /* Begin PBXResourcesBuildPhase section */
127 | 		3E4A19431C8F1948006032BC /* Resources */ = {
128 | 			isa = PBXResourcesBuildPhase;
129 | 			buildActionMask = 2147483647;
130 | 			files = (
131 | 				3E4A19531C8F1948006032BC /* LaunchScreen.storyboard in Resources */,
132 | 				3E4A195D1C8F1B9E006032BC /* IMG_0195.jpg in Resources */,
133 | 				3E4A19501C8F1948006032BC /* Assets.xcassets in Resources */,
134 | 				3E4A195B1C8F1972006032BC /* NebulaShader.cikernel in Resources */,
135 | 				3E4A194E1C8F1948006032BC /* Main.storyboard in Resources */,
136 | 			);
137 | 			runOnlyForDeploymentPostprocessing = 0;
138 | 		};
139 | /* End PBXResourcesBuildPhase section */
140 | 
141 | /* Begin PBXSourcesBuildPhase section */
142 | 		3E4A19411C8F1948006032BC /* Sources */ = {
143 | 			isa = PBXSourcesBuildPhase;
144 | 			buildActionMask = 2147483647;
145 | 			files = (
146 | 				3E4A194B1C8F1948006032BC /* ViewController.swift in Sources */,
147 | 				3E4A19491C8F1948006032BC /* AppDelegate.swift in Sources */,
148 | 			);
149 | 			runOnlyForDeploymentPostprocessing = 0;
150 | 		};
151 | /* End PBXSourcesBuildPhase section */
152 | 
153 | /* Begin PBXVariantGroup section */
154 | 		3E4A194C1C8F1948006032BC /* Main.storyboard */ = {
155 | 			isa = PBXVariantGroup;
156 | 			children = (
157 | 				3E4A194D1C8F1948006032BC /* Base */,
158 | 			);
159 | 			name = Main.storyboard;
160 | 			sourceTree = "<group>";
161 | 		};
162 | 		3E4A19511C8F1948006032BC /* LaunchScreen.storyboard */ = {
163 | 			isa = PBXVariantGroup;
164 | 			children = (
165 | 				3E4A19521C8F1948006032BC /* Base */,
166 | 			);
167 | 			name = LaunchScreen.storyboard;
168 | 			sourceTree = "<group>";
169 | 		};
170 | /* End PBXVariantGroup section */
171 | 
172 | /* Begin XCBuildConfiguration section */
173 | 		3E4A19551C8F1948006032BC /* Debug */ = {
174 | 			isa = XCBuildConfiguration;
175 | 			buildSettings = {
176 | 				ALWAYS_SEARCH_USER_PATHS = NO;
177 | 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
178 | 				CLANG_CXX_LIBRARY = "libc++";
179 | 				CLANG_ENABLE_MODULES = YES;
180 | 				CLANG_ENABLE_OBJC_ARC = YES;
181 | 				CLANG_WARN_BOOL_CONVERSION = YES;
182 | 				CLANG_WARN_CONSTANT_CONVERSION = YES;
183 | 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
184 | 				CLANG_WARN_EMPTY_BODY = YES;
185 | 				CLANG_WARN_ENUM_CONVERSION = YES;
186 | 				CLANG_WARN_INT_CONVERSION = YES;
187 | 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
188 | 				CLANG_WARN_UNREACHABLE_CODE = YES;
189 | 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
190 | 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
191 | 				COPY_PHASE_STRIP = NO;
192 | 				DEBUG_INFORMATION_FORMAT = dwarf;
193 | 				ENABLE_STRICT_OBJC_MSGSEND = YES;
194 | 				ENABLE_TESTABILITY = YES;
195 | 				GCC_C_LANGUAGE_STANDARD = gnu99;
196 | 				GCC_DYNAMIC_NO_PIC = NO;
197 | 				GCC_NO_COMMON_BLOCKS = YES;
198 | 				GCC_OPTIMIZATION_LEVEL = 0;
199 | 				GCC_PREPROCESSOR_DEFINITIONS = (
200 | 					"DEBUG=1",
201 | 					"$(inherited)",
202 | 				);
203 | 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
204 | 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
205 | 				GCC_WARN_UNDECLARED_SELECTOR = YES;
206 | 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
207 | 				GCC_WARN_UNUSED_FUNCTION = YES;
208 | 				GCC_WARN_UNUSED_VARIABLE = YES;
209 | 				IPHONEOS_DEPLOYMENT_TARGET = 9.2;
210 | 				MTL_ENABLE_DEBUG_INFO = YES;
211 | 				ONLY_ACTIVE_ARCH = YES;
212 | 				SDKROOT = iphoneos;
213 | 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
214 | 				TARGETED_DEVICE_FAMILY = 2;
215 | 			};
216 | 			name = Debug;
217 | 		};
218 | 		3E4A19561C8F1948006032BC /* Release */ = {
219 | 			isa = XCBuildConfiguration;
220 | 			buildSettings = {
221 | 				ALWAYS_SEARCH_USER_PATHS = NO;
222 | 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
223 | 				CLANG_CXX_LIBRARY = "libc++";
224 | 				CLANG_ENABLE_MODULES = YES;
225 | 				CLANG_ENABLE_OBJC_ARC = YES;
226 | 				CLANG_WARN_BOOL_CONVERSION = YES;
227 | 				CLANG_WARN_CONSTANT_CONVERSION = YES;
228 | 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
229 | 				CLANG_WARN_EMPTY_BODY = YES;
230 | 				CLANG_WARN_ENUM_CONVERSION = YES;
231 | 				CLANG_WARN_INT_CONVERSION = YES;
232 | 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
233 | 				CLANG_WARN_UNREACHABLE_CODE = YES;
234 | 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
235 | 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
236 | 				COPY_PHASE_STRIP = NO;
237 | 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
238 | 				ENABLE_NS_ASSERTIONS = NO;
239 | 				ENABLE_STRICT_OBJC_MSGSEND = YES;
240 | 				GCC_C_LANGUAGE_STANDARD = gnu99;
241 | 				GCC_NO_COMMON_BLOCKS = YES;
242 | 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
243 | 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
244 | 				GCC_WARN_UNDECLARED_SELECTOR = YES;
245 | 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
246 | 				GCC_WARN_UNUSED_FUNCTION = YES;
247 | 				GCC_WARN_UNUSED_VARIABLE = YES;
248 | 				IPHONEOS_DEPLOYMENT_TARGET = 9.2;
249 | 				MTL_ENABLE_DEBUG_INFO = NO;
250 | 				SDKROOT = iphoneos;
251 | 				TARGETED_DEVICE_FAMILY = 2;
252 | 				VALIDATE_PRODUCT = YES;
253 | 			};
254 | 			name = Release;
255 | 		};
256 | 		3E4A19581C8F1948006032BC /* Debug */ = {
257 | 			isa = XCBuildConfiguration;
258 | 			buildSettings = {
259 | 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
260 | 				INFOPLIST_FILE = Nebula/Info.plist;
261 | 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
262 | 				PRODUCT_BUNDLE_IDENTIFIER = uk.co.flexmonkey.Nebula;
263 | 				PRODUCT_NAME = "$(TARGET_NAME)";
264 | 				TARGETED_DEVICE_FAMILY = "1,2";
265 | 			};
266 | 			name = Debug;
267 | 		};
268 | 		3E4A19591C8F1948006032BC /* Release */ = {
269 | 			isa = XCBuildConfiguration;
270 | 			buildSettings = {
271 | 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
272 | 				INFOPLIST_FILE = Nebula/Info.plist;
273 | 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
274 | 				PRODUCT_BUNDLE_IDENTIFIER = uk.co.flexmonkey.Nebula;
275 | 				PRODUCT_NAME = "$(TARGET_NAME)";
276 | 				TARGETED_DEVICE_FAMILY = "1,2";
277 | 			};
278 | 			name = Release;
279 | 		};
280 | /* End XCBuildConfiguration section */
281 | 
282 | /* Begin XCConfigurationList section */
283 | 		3E4A19401C8F1948006032BC /* Build configuration list for PBXProject "Nebula" */ = {
284 | 			isa = XCConfigurationList;
285 | 			buildConfigurations = (
286 | 				3E4A19551C8F1948006032BC /* Debug */,
287 | 				3E4A19561C8F1948006032BC /* Release */,
288 | 			);
289 | 			defaultConfigurationIsVisible = 0;
290 | 			defaultConfigurationName = Release;
291 | 		};
292 | 		3E4A19571C8F1948006032BC /* Build configuration list for PBXNativeTarget "Nebula" */ = {
293 | 			isa = XCConfigurationList;
294 | 			buildConfigurations = (
295 | 				3E4A19581C8F1948006032BC /* Debug */,
296 | 				3E4A19591C8F1948006032BC /* Release */,
297 | 			);
298 | 			defaultConfigurationIsVisible = 0;
299 | 			defaultConfigurationName = Release;
300 | 		};
301 | /* End XCConfigurationList section */
302 | 	};
303 | 	rootObject = 3E4A193D1C8F1948006032BC /* Project object */;
304 | }
305 | 


--------------------------------------------------------------------------------
/Nebula.xcodeproj/project.xcworkspace/contents.xcworkspacedata:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <Workspace
3 |    version = "1.0">
4 |    <FileRef
5 |       location = "self:Nebula.xcodeproj">
6 |    </FileRef>
7 | </Workspace>
8 | 


--------------------------------------------------------------------------------
/Nebula.xcodeproj/xcuserdata/simongladman.xcuserdatad/xcschemes/Nebula.xcscheme:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <Scheme
 3 |    LastUpgradeVersion = "0720"
 4 |    version = "1.3">
 5 |    <BuildAction
 6 |       parallelizeBuildables = "YES"
 7 |       buildImplicitDependencies = "YES">
 8 |       <BuildActionEntries>
 9 |          <BuildActionEntry
10 |             buildForTesting = "YES"
11 |             buildForRunning = "YES"
12 |             buildForProfiling = "YES"
13 |             buildForArchiving = "YES"
14 |             buildForAnalyzing = "YES">
15 |             <BuildableReference
16 |                BuildableIdentifier = "primary"
17 |                BlueprintIdentifier = "3E4A19441C8F1948006032BC"
18 |                BuildableName = "Nebula.app"
19 |                BlueprintName = "Nebula"
20 |                ReferencedContainer = "container:Nebula.xcodeproj">
21 |             </BuildableReference>
22 |          </BuildActionEntry>
23 |       </BuildActionEntries>
24 |    </BuildAction>
25 |    <TestAction
26 |       buildConfiguration = "Debug"
27 |       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
28 |       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
29 |       shouldUseLaunchSchemeArgsEnv = "YES">
30 |       <Testables>
31 |       </Testables>
32 |       <MacroExpansion>
33 |          <BuildableReference
34 |             BuildableIdentifier = "primary"
35 |             BlueprintIdentifier = "3E4A19441C8F1948006032BC"
36 |             BuildableName = "Nebula.app"
37 |             BlueprintName = "Nebula"
38 |             ReferencedContainer = "container:Nebula.xcodeproj">
39 |          </BuildableReference>
40 |       </MacroExpansion>
41 |       <AdditionalOptions>
42 |       </AdditionalOptions>
43 |    </TestAction>
44 |    <LaunchAction
45 |       buildConfiguration = "Release"
46 |       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
47 |       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
48 |       launchStyle = "0"
49 |       useCustomWorkingDirectory = "NO"
50 |       ignoresPersistentStateOnLaunch = "NO"
51 |       debugDocumentVersioning = "YES"
52 |       debugServiceExtension = "internal"
53 |       allowLocationSimulation = "YES">
54 |       <BuildableProductRunnable
55 |          runnableDebuggingMode = "0">
56 |          <BuildableReference
57 |             BuildableIdentifier = "primary"
58 |             BlueprintIdentifier = "3E4A19441C8F1948006032BC"
59 |             BuildableName = "Nebula.app"
60 |             BlueprintName = "Nebula"
61 |             ReferencedContainer = "container:Nebula.xcodeproj">
62 |          </BuildableReference>
63 |       </BuildableProductRunnable>
64 |       <AdditionalOptions>
65 |       </AdditionalOptions>
66 |    </LaunchAction>
67 |    <ProfileAction
68 |       buildConfiguration = "Release"
69 |       shouldUseLaunchSchemeArgsEnv = "YES"
70 |       savedToolIdentifier = ""
71 |       useCustomWorkingDirectory = "NO"
72 |       debugDocumentVersioning = "YES">
73 |       <BuildableProductRunnable
74 |          runnableDebuggingMode = "0">
75 |          <BuildableReference
76 |             BuildableIdentifier = "primary"
77 |             BlueprintIdentifier = "3E4A19441C8F1948006032BC"
78 |             BuildableName = "Nebula.app"
79 |             BlueprintName = "Nebula"
80 |             ReferencedContainer = "container:Nebula.xcodeproj">
81 |          </BuildableReference>
82 |       </BuildableProductRunnable>
83 |    </ProfileAction>
84 |    <AnalyzeAction
85 |       buildConfiguration = "Debug">
86 |    </AnalyzeAction>
87 |    <ArchiveAction
88 |       buildConfiguration = "Release"
89 |       revealArchiveInOrganizer = "YES">
90 |    </ArchiveAction>
91 | </Scheme>
92 | 


--------------------------------------------------------------------------------
/Nebula.xcodeproj/xcuserdata/simongladman.xcuserdatad/xcschemes/xcschememanagement.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>SchemeUserState</key>
 6 | 	<dict>
 7 | 		<key>Nebula.xcscheme</key>
 8 | 		<dict>
 9 | 			<key>orderHint</key>
10 | 			<integer>0</integer>
11 | 		</dict>
12 | 	</dict>
13 | 	<key>SuppressBuildableAutocreation</key>
14 | 	<dict>
15 | 		<key>3E4A19441C8F1948006032BC</key>
16 | 		<dict>
17 | 			<key>primary</key>
18 | 			<true/>
19 | 		</dict>
20 | 	</dict>
21 | </dict>
22 | </plist>
23 | 


--------------------------------------------------------------------------------
/Nebula/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  Nebula
 4 | //
 5 | //  Created by Simon Gladman on 08/03/2016.
 6 | //  Copyright © 2016 Simon Gladman. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | @UIApplicationMain
12 | class AppDelegate: UIResponder, UIApplicationDelegate {
13 | 
14 |     var window: UIWindow?
15 | 
16 | 
17 |     func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
18 |         // Override point for customization after application launch.
19 |         return true
20 |     }
21 | 
22 |     func applicationWillResignActive(application: UIApplication) {
23 |         // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
24 |         // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
25 |     }
26 | 
27 |     func applicationDidEnterBackground(application: UIApplication) {
28 |         // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
29 |         // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
30 |     }
31 | 
32 |     func applicationWillEnterForeground(application: UIApplication) {
33 |         // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
34 |     }
35 | 
36 |     func applicationDidBecomeActive(application: UIApplication) {
37 |         // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
38 |     }
39 | 
40 |     func applicationWillTerminate(application: UIApplication) {
41 |         // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
42 |     }
43 | 
44 | 
45 | }
46 | 
47 | 


--------------------------------------------------------------------------------
/Nebula/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "ipad",
 5 |       "size" : "29x29",
 6 |       "scale" : "1x"
 7 |     },
 8 |     {
 9 |       "idiom" : "ipad",
10 |       "size" : "29x29",
11 |       "scale" : "2x"
12 |     },
13 |     {
14 |       "idiom" : "ipad",
15 |       "size" : "40x40",
16 |       "scale" : "1x"
17 |     },
18 |     {
19 |       "idiom" : "ipad",
20 |       "size" : "40x40",
21 |       "scale" : "2x"
22 |     },
23 |     {
24 |       "idiom" : "ipad",
25 |       "size" : "76x76",
26 |       "scale" : "1x"
27 |     },
28 |     {
29 |       "idiom" : "ipad",
30 |       "size" : "76x76",
31 |       "scale" : "2x"
32 |     }
33 |   ],
34 |   "info" : {
35 |     "version" : 1,
36 |     "author" : "xcode"
37 |   }
38 | }


--------------------------------------------------------------------------------
/Nebula/Base.lproj/LaunchScreen.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8150" systemVersion="15A204g" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8122"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--View Controller-->
 8 |         <scene sceneID="EHf-IW-A2E">
 9 |             <objects>
10 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <animations/>
19 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
20 |                     </view>
21 |                 </viewController>
22 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
23 |             </objects>
24 |             <point key="canvasLocation" x="53" y="375"/>
25 |         </scene>
26 |     </scenes>
27 | </document>
28 | 


--------------------------------------------------------------------------------
/Nebula/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6211" systemVersion="14A298i" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6204"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--View Controller-->
 8 |         <scene sceneID="tne-QT-ifu">
 9 |             <objects>
10 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="target" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
19 |                     </view>
20 |                 </viewController>
21 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
22 |             </objects>
23 |         </scene>
24 |     </scenes>
25 | </document>
26 | 


--------------------------------------------------------------------------------
/Nebula/IMG_0195.jpg:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/FlexMonkey/Nebula/4faa2f1e6a6285e0a7c1da0340f4d2ec8930bdbf/Nebula/IMG_0195.jpg


--------------------------------------------------------------------------------
/Nebula/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>APPL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleSignature</key>
20 | 	<string>????</string>
21 | 	<key>CFBundleVersion</key>
22 | 	<string>1</string>
23 | 	<key>LSRequiresIPhoneOS</key>
24 | 	<true/>
25 | 	<key>UILaunchStoryboardName</key>
26 | 	<string>LaunchScreen</string>
27 | 	<key>UIMainStoryboardFile</key>
28 | 	<string>Main</string>
29 | 	<key>UIRequiredDeviceCapabilities</key>
30 | 	<array>
31 | 		<string>armv7</string>
32 | 	</array>
33 | 	<key>UISupportedInterfaceOrientations~ipad</key>
34 | 	<array>
35 | 		<string>UIInterfaceOrientationPortrait</string>
36 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
37 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
38 | 		<string>UIInterfaceOrientationLandscapeRight</string>
39 | 	</array>
40 | </dict>
41 | </plist>
42 | 


--------------------------------------------------------------------------------
/Nebula/NebulaShader.cikernel:
--------------------------------------------------------------------------------
  1 | // Based on http://glslsandbox.com/e#31308.0
  2 | 
  3 | #define iterations 4
  4 | #define formuparam2 0.89
  5 | 
  6 | #define volsteps 5
  7 | #define stepsize 0.190
  8 | 
  9 | #define zoom 3.900
 10 | #define tile   0.450
 11 | #define speed2  0.010
 12 | 
 13 | #define brightness 0.2
 14 | #define darkmatter 0.400
 15 | #define distfading 0.560
 16 | #define saturation 0.400
 17 | 
 18 | 
 19 | #define transverseSpeed 1.1
 20 | #define cloud 0.2
 21 | 
 22 | float field(in vec3 p, float time)
 23 | {
 24 | float strength = 7. + .03 * log(1.e-6 + fract(sin(time) * 4373.11));
 25 | float accum = 0.;
 26 | float prev = 0.;
 27 | float tw = 0.;
 28 | 
 29 | 
 30 | for (int i = 0; i < 6; ++i)
 31 | {
 32 | float mag = dot(p, p);
 33 | p = abs(p) / mag + vec3(-.5, -.8 + 0.1*sin(time*0.2 + 2.0), -1.1+0.3*cos(time*0.15));
 34 | float w = exp(-float(i) / 7.);
 35 | accum += w * exp(-strength * pow(abs(mag - prev), 2.3));
 36 | tw += w;
 37 | prev = mag;
 38 | }
 39 | return max(0., 5. * accum / tw - .7);
 40 | }
 41 | 
 42 | 
 43 | 
 44 | kernel vec4 nebulaKernel(float time, vec2 mouse, vec2 resolution)
 45 | {
 46 | vec2 uv2 = 2. * destCoord().xy / resolution.xy - 1.;
 47 | vec2 uvs = uv2 * resolution.xy / max(resolution.x, resolution.y);
 48 | 
 49 | 
 50 | 
 51 | float time2 = time;
 52 | 
 53 | float speed = speed2;
 54 | speed = 0.005 * cos(time2*0.02 + 3.1415926/4.0);
 55 | 
 56 | //speed = 0.0;
 57 | 
 58 | 
 59 | float formuparam = formuparam2;
 60 | 
 61 | //get coords and direction
 62 | 
 63 | vec2 uv = uvs;
 64 | 
 65 | 
 66 | 
 67 | //mouse rotation
 68 | float a_xz = 0.9;
 69 | float a_yz = -.6;
 70 | float a_xy = 0.9 + time*0.04;
 71 | 
 72 | 
 73 | mat2 rot_xz = mat2(cos(a_xz),sin(a_xz),-sin(a_xz),cos(a_xz));
 74 | 
 75 | mat2 rot_yz = mat2(cos(a_yz),sin(a_yz),-sin(a_yz),cos(a_yz));
 76 | 
 77 | mat2 rot_xy = mat2(cos(a_xy),sin(a_xy),-sin(a_xy),cos(a_xy));
 78 | 
 79 | 
 80 | float v2 =1.0;
 81 | 
 82 | vec3 dir=vec3(uv*zoom,1.);
 83 | 
 84 | vec3 from=vec3(0.0, 0.0,0.0);
 85 | 
 86 | 
 87 | from.x -= .5*(mouse.x-0.5);
 88 | from.y -= .5*(mouse.y-0.5);
 89 | 
 90 | 
 91 | vec3 forward = vec3(0.,0.,1.);
 92 | 
 93 | 
 94 | from.x += transverseSpeed*(1.0)*cos(0.01*time) + 0.001*time;
 95 | from.y += transverseSpeed*(1.0)*sin(0.01*time) +0.001*time;
 96 | 
 97 | from.z += 0.003*time;
 98 | 
 99 | 
100 | dir.xy*=rot_xy;
101 | forward.xy *= rot_xy;
102 | 
103 | dir.xz*=rot_xz;
104 | forward.xz *= rot_xz;
105 | 
106 | 
107 | dir.yz*= rot_yz;
108 | forward.yz *= rot_yz;
109 | 
110 | 
111 | 
112 | from.xy*=-rot_xy;
113 | from.xz*=rot_xz;
114 | from.yz*= rot_yz;
115 | 
116 | 
117 | //zoom
118 | float zooom = (time2-3311.)*speed;
119 | from += forward* zooom;
120 | float sampleShift = mod( zooom, stepsize );
121 | 
122 | float zoffset = -sampleShift;
123 | sampleShift /= stepsize; // make from 0 to 1
124 | 
125 | 
126 | 
127 | //volumetric rendering
128 | float s=0.24;
129 | float s3 = s + stepsize/2.0;
130 | vec3 v=vec3(0.);
131 | float t3 = 0.0;
132 | 
133 | 
134 | vec3 backCol2 = vec3(0.);
135 | for (int r=0; r<volsteps; r++) {
136 | vec3 p2=from+(s+zoffset)*dir;// + vec3(0.,0.,zoffset);
137 | vec3 p3=(from+(s3+zoffset)*dir )* (1.9/zoom);// + vec3(0.,0.,zoffset);
138 | 
139 | p2 = abs(vec3(tile)-mod(p2,vec3(tile*2.))); // tiling fold
140 | p3 = abs(vec3(tile)-mod(p3,vec3(tile*2.))); // tiling fold
141 | 
142 | #ifdef cloud
143 | t3 = field(p3, time);
144 | #endif
145 | 
146 | float pa,a=pa=0.;
147 | for (int i=0; i<iterations; i++) {
148 | p2=abs(p2)/dot(p2,p2)-formuparam; // the magic formula
149 | //p=abs(p)/max(dot(p,p),0.005)-formuparam; // another interesting way to reduce noise
150 | float D = abs(length(p2)-pa); // absolute sum of average change
151 | 
152 | if (i > 2)
153 | {
154 | a += i > 7 ? min( 12., D) : D;
155 | }
156 | pa=length(p2);
157 | }
158 | 
159 | 
160 | //float dm=max(0.,darkmatter-a*a*.001); //dark matter
161 | a*=a*a; // add contrast
162 | //if (r>3) fade*=1.-dm; // dark matter, don't render near
163 | // brightens stuff up a bit
164 | float s1 = s+zoffset;
165 | // need closed form expression for this, now that we shift samples
166 | float fade = pow(distfading,max(0.,float(r)-sampleShift));
167 | 
168 | 
169 | //t3 += fade;
170 | 
171 | v+=fade;
172 | //backCol2 -= fade;
173 | 
174 | // fade out samples as they approach the camera
175 | if( r == 0 )
176 | fade *= (1. - (sampleShift));
177 | // fade in samples as they approach from the distance
178 | if( r == volsteps-1 )
179 | fade *= sampleShift;
180 | v+=vec3(s1,s1*s1,s1*s1*s1*s1)*a*brightness*fade; // coloring based on distance
181 | 
182 | backCol2 += mix(.4, 1., v2) * vec3(0.20 * t3 * t3 * t3, 0.4 * t3 * t3, t3 * 0.7) * fade;
183 | 
184 | 
185 | s+=stepsize;
186 | s3 += stepsize;
187 | 
188 | 
189 | 
190 | }
191 | 
192 | v=mix(vec3(length(v)),v,saturation); //color adjust
193 | 
194 | 
195 | 
196 | 
197 | vec4 forCol2 = vec4(v*.01,1.);
198 | 
199 | #ifdef cloud
200 | backCol2 *= cloud;
201 | #endif
202 | 
203 | //backCol2.b *= 1.8;
204 | 
205 | //backCol2.r *= 0.05;
206 | 
207 | 
208 | 
209 | //backCol2.b = 0.5*mix(backCol2.b, backCol2.g, 0.2);
210 | //backCol2.g = 0.0;
211 | 
212 | //	backCol2.bg = mix(backCol2.gb, backCol2.bg, 0.5*(cos(time*0.01) + 1.0));
213 | 
214 | return forCol2 + vec4(backCol2, 1.0);
215 | }


--------------------------------------------------------------------------------
/Nebula/ViewController.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  ViewController.swift
  3 | //  Nebula
  4 | //
  5 | //  Created by Simon Gladman on 08/03/2016.
  6 | //  Copyright © 2016 Simon Gladman. All rights reserved.
  7 | //
  8 | 
  9 | //
 10 | // Based on http://glslsandbox.com/e#31308.0
 11 | 
 12 | import UIKit
 13 | import GLKit
 14 | 
 15 | class ViewController: UIViewController
 16 | {
 17 |     var time: CGFloat = 1
 18 |     var touchPosition = CIVector(x: 0, y: 0)
 19 |     
 20 |     let imageView = OpenGLImageView()
 21 |     
 22 |     lazy var nebulaKernel: CIColorKernel =
 23 |     {
 24 |         let nebulaShaderPath = NSBundle.mainBundle().pathForResource("NebulaShader", ofType: "cikernel")
 25 |         
 26 |         guard let path = nebulaShaderPath,
 27 |             code = try? String(contentsOfFile: path),
 28 |             kernel = CIColorKernel(string: code) else
 29 |         {
 30 |             fatalError("Unable to build nebula shader")
 31 |         }
 32 |         
 33 |         return kernel
 34 |     }()
 35 |     
 36 |     override func viewDidLoad()
 37 |     {
 38 |         super.viewDidLoad()
 39 |         
 40 |         view.addSubview(imageView)
 41 |         
 42 |         let displayLink = CADisplayLink(target: self, selector: Selector("step"))
 43 |         displayLink.addToRunLoop(NSRunLoop.mainRunLoop(), forMode: NSDefaultRunLoopMode)
 44 |     }
 45 |     
 46 |     // MARK: Touch Handling
 47 |     
 48 |     override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
 49 |     {
 50 |         guard let locationInView = touches.first?.locationInView(view) else
 51 |         {
 52 |             return
 53 |         }
 54 |         
 55 |         touchPosition = CIVector(x: view.frame.height / 2 - locationInView.y,
 56 |             y: view.frame.width / 2 - locationInView.x)
 57 |     }
 58 |     
 59 |     // MARK: Step
 60 |     
 61 |     func step()
 62 |     {
 63 |         time += 0.01
 64 |         
 65 |         let resolution = CIVector(x: view.frame.width, y: view.frame.height)
 66 |         
 67 |         let arguments = [time, touchPosition, resolution]
 68 |         
 69 |         let image = nebulaKernel.applyWithExtent(view.bounds, arguments: arguments)
 70 |         
 71 |         imageView.image = image
 72 |     }
 73 |     
 74 |     override func viewDidLayoutSubviews()
 75 |     {
 76 |         imageView.frame = view.bounds
 77 |     }
 78 |     
 79 |     override func prefersStatusBarHidden() -> Bool
 80 |     {
 81 |         return true
 82 |     }
 83 | }
 84 | 
 85 | // -----
 86 | 
 87 | class OpenGLImageView: GLKView
 88 | {
 89 |     let eaglContext = EAGLContext(API: .OpenGLES2)
 90 |     
 91 |     lazy var ciContext: CIContext =
 92 |     {
 93 |         [unowned self] in
 94 |         
 95 |         return CIContext(EAGLContext: self.eaglContext,
 96 |             options: [kCIContextWorkingColorSpace: NSNull()])
 97 |         }()
 98 |     
 99 |     override init(frame: CGRect)
100 |     {
101 |         super.init(frame: frame, context: eaglContext)
102 |         
103 |         context = self.eaglContext
104 |         delegate = self
105 |     }
106 |     
107 |     override init(frame: CGRect, context: EAGLContext)
108 |     {
109 |         fatalError("init(frame:, context:) has not been implemented")
110 |     }
111 |     
112 |     required init?(coder aDecoder: NSCoder)
113 |     {
114 |         fatalError("init(coder:) has not been implemented")
115 |     }
116 |     
117 |     /// The image to display
118 |     var image: CIImage?
119 |         {
120 |         didSet
121 |         {
122 |             setNeedsDisplay()
123 |         }
124 |     }
125 | }
126 | 
127 | extension OpenGLImageView: GLKViewDelegate
128 | {
129 |     func glkView(view: GLKView, drawInRect rect: CGRect)
130 |     {
131 |         guard let image = image else
132 |         {
133 |             return
134 |         }
135 |         
136 |         let targetRect = image.extent.aspectFitInRect(
137 |             target: CGRect(origin: CGPointZero,
138 |                 size: CGSize(width: drawableWidth,
139 |                     height: drawableHeight)))
140 |         
141 |         let ciBackgroundColor = CIColor(
142 |             color: backgroundColor ?? UIColor.whiteColor())
143 |         
144 |         ciContext.drawImage(CIImage(color: ciBackgroundColor),
145 |             inRect: CGRect(x: 0,
146 |                 y: 0,
147 |                 width: drawableWidth,
148 |                 height: drawableHeight),
149 |             fromRect: CGRect(x: 0,
150 |                 y: 0,
151 |                 width: drawableWidth,
152 |                 height: drawableHeight))
153 |         
154 |         ciContext.drawImage(image,
155 |             inRect: targetRect,
156 |             fromRect: image.extent)
157 |     }
158 | }
159 | 
160 | extension CGRect
161 | {
162 |     func aspectFitInRect(target target: CGRect) -> CGRect
163 |     {
164 |         let scale: CGFloat =
165 |         {
166 |             let scale = target.width / self.width
167 |             
168 |             return self.height * scale <= target.height ?
169 |                 scale :
170 |                 target.height / self.height
171 |         }()
172 |         
173 |         let width = self.width * scale
174 |         let height = self.height * scale
175 |         let x = target.midX - width / 2
176 |         let y = target.midY - height / 2
177 |         
178 |         return CGRect(x: x,
179 |             y: y,
180 |             width: width,
181 |             height: height)
182 |     }
183 | }
184 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # Nebula
2 | Core Image Volumetric Rendering 
3 | 
4 | ![IMG_0195.jpg](Nebula/IMG_0195.jpg)
5 | 
6 | I'd love to be able to take credit for this shader, but the hard work isn't mine! This volumetric nebula shader code originates from [glslsandbox.com](http://glslsandbox.com/e#31308.0) . All I've done is changed `main()` to a kernel function, swapped out `gl_FragCoord` for `destCoord` and wrapped the code in a `CIColorKernel`.
7 | 
8 | On my iPad Pro, I get around 30fps rendering at 2732 x 2048 - not too bad!
9 | 


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