Merge pull request #13194 from donmccurdy/feat-gltf-draco-extension-v4

GLTFLoader: Implement KHR_draco_mesh_compression

docs/examples/loaders/GLTFLoader.html

@@ -32,6 +32,11 @@
 					KHR_materials_pbrSpecularGlossiness
 				</a>
 			</li>
+			<li>
+				<a target="_blank" href="https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_draco_mesh_compression">
+					KHR_draco_mesh_compression
+				</a>
+			</li>
 			<li>
 				KHR_lights (experimental)
 			</li>
@@ -43,6 +48,10 @@
 			// Instantiate a loader
 			var loader = new THREE.GLTFLoader();
 
+			// Optional: Provide a DRACOLoader instance to decode compressed mesh data
+			THREE.DRACOLoader.setDecoderPath( '/examples/js/loaders/draco' );
+			loader.setDRACOLoader( new THREE.DRACOLoader() );
+
 			// Load a glTF resource
 			loader.load(
 				// resource URL
@@ -124,6 +133,11 @@
 		[page:String value] — The crossOrigin string to implement CORS for loading the url from a different domain that allows CORS.
 		</div>
 
+		<h3>[method:null setDRACOLoader]( [page:DRACOLoader dracoLoader] )</h3>
+		<div>
+		[page:DRACOLoader dracoLoader] — Instance of THREE.DRACOLoader, to be used for decoding assets compressed with the KHR_draco_mesh_compression extension.
+		</div>
+
 		<h3>[method:null parse]( [page:ArrayBuffer data], [page:String path], [page:Function onLoad], [page:Function onError] )</h3>
 		<div>
 		[page:ArrayBuffer data] — glTF asset to parse, as an ArrayBuffer or <em>JSON</em> string.<br />

examples/js/loaders/GLTFLoader.js

@@ -11,6 +11,7 @@ THREE.GLTFLoader = ( function () {
 	function GLTFLoader( manager ) {
 
 		this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;
+		this.dracoLoader = null;
 
 	}
 
@@ -68,6 +69,12 @@ THREE.GLTFLoader = ( function () {
 
 		},
 
+		setDRACOLoader: function ( dracoLoader ) {
+
+			this.dracoLoader = dracoLoader;
+
+		},
+
 		parse: function ( data, path, onLoad, onError ) {
 
 			var content;
@@ -127,6 +134,12 @@ THREE.GLTFLoader = ( function () {
 
 				}
 
+				if ( json.extensionsUsed.indexOf( EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ) >= 0 ) {
+
+					extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ] = new GLTFDracoMeshCompressionExtension( this.dracoLoader );
+
+				}
+
 			}
 
 			console.time( 'GLTFLoader' );
@@ -201,6 +214,7 @@ THREE.GLTFLoader = ( function () {
 
 	var EXTENSIONS = {
 		KHR_BINARY_GLTF: 'KHR_binary_glTF',
+		KHR_DRACO_MESH_COMPRESSION: 'KHR_draco_mesh_compression',
 		KHR_LIGHTS: 'KHR_lights',
 		KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS: 'KHR_materials_pbrSpecularGlossiness'
 	};
@@ -357,6 +371,51 @@ THREE.GLTFLoader = ( function () {
 
 	}
 
+	/**
+	 * DRACO Mesh Compression Extension
+	 *
+	 * Specification: https://github.com/KhronosGroup/glTF/pull/874
+	 */
+	function GLTFDracoMeshCompressionExtension ( dracoLoader ) {
+
+		if ( ! dracoLoader ) {
+
+			throw new Error( 'THREE.GLTFLoader: No DRACOLoader instance provided.' );
+
+		}
+
+		this.name = EXTENSIONS.KHR_DRACO_MESH_COMPRESSION;
+		this.dracoLoader = dracoLoader;
+
+	}
+
+	GLTFDracoMeshCompressionExtension.prototype.decodePrimitive = function ( primitive, parser ) {
+
+		var dracoLoader = this.dracoLoader;
+		var bufferViewIndex = primitive.extensions[ this.name ].bufferView;
+		var gltfAttributeMap = primitive.extensions[ this.name ].attributes;
+		var threeAttributeMap = {};
+
+		for ( var attributeName in gltfAttributeMap ) {
+
+			if ( !( attributeName in ATTRIBUTES ) ) continue;
+
+			threeAttributeMap[ ATTRIBUTES[ attributeName ] ] = gltfAttributeMap[ attributeName ];
+
+		}
+
+		return parser.getDependency( 'bufferView', bufferViewIndex ).then( function ( bufferView ) {
+
+			return new Promise( function ( resolve ) {
+
+				dracoLoader.decodeDracoFile( bufferView, resolve, threeAttributeMap );
+
+			} );
+
+		} );
+
+	};
+
 	/**
 	 * Specular-Glossiness Extension
 	 *
@@ -941,6 +1000,22 @@ THREE.GLTFLoader = ( function () {
 		'MAT4': 16
 	};
 
+	var ATTRIBUTES = {
+		POSITION: 'position',
+		NORMAL: 'normal',
+		TEXCOORD_0: 'uv',
+		TEXCOORD0: 'uv', // deprecated
+		TEXCOORD: 'uv', // deprecated
+		TEXCOORD_1: 'uv2',
+		COLOR_0: 'color',
+		COLOR0: 'color', // deprecated
+		COLOR: 'color', // deprecated
+		WEIGHTS_0: 'skinWeight',
+		WEIGHT: 'skinWeight', // deprecated
+		JOINTS_0: 'skinIndex',
+		JOINT: 'skinIndex' // deprecated
+	}
+
 	var PATH_PROPERTIES = {
 		scale: 'scale',
 		translation: 'position',
@@ -1013,8 +1088,6 @@ THREE.GLTFLoader = ( function () {
 	/**
 	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#morph-targets
 	 *
-	 * TODO: Implement support for morph targets on TANGENT attribute.
-	 *
 	 * @param {THREE.Mesh} mesh
 	 * @param {GLTF.Mesh} meshDef
 	 * @param {GLTF.Primitive} primitiveDef
@@ -1177,7 +1250,7 @@ THREE.GLTFLoader = ( function () {
 
 			if ( isPrimitiveEqual( cached.primitive, newPrimitive ) ) {
 
-				return cached.geometry;
+				return cached.promise;
 
 			}
 
@@ -1480,6 +1553,15 @@ THREE.GLTFLoader = ( function () {
 
 		var accessorDef = this.json.accessors[ accessorIndex ];
 
+		if ( accessorDef.bufferView === undefined && accessorDef.sparse === undefined ) {
+
+			// Ignore empty accessors, which may be used to declare runtime
+			// information about attributes coming from another source (e.g. Draco
+			// compression extension).
+			return null;
+
+		}
+
 		var pendingBufferViews = [];
 
 		if ( accessorDef.bufferView !== undefined ) {
@@ -1873,6 +1955,36 @@ THREE.GLTFLoader = ( function () {
 
 	};
 
+	/**
+	 * @param  {THREE.BufferGeometry} geometry
+	 * @param  {GLTF.Primitive} primitiveDef
+	 * @param  {Array<THREE.BufferAttribute>} accessors
+	 */
+	function addPrimitiveAttributes ( geometry, primitiveDef, accessors ) {
+
+		var attributes = primitiveDef.attributes;
+
+		for ( var gltfAttributeName in attributes ) {
+
+			var threeAttributeName = ATTRIBUTES[ gltfAttributeName ];
+			var bufferAttribute = accessors[ attributes[ gltfAttributeName ] ];
+
+			// Skip attributes already provided by e.g. Draco extension.
+			if ( !threeAttributeName ) continue;
+			if ( threeAttributeName in geometry.attributes ) continue;
+
+			geometry.addAttribute( threeAttributeName, bufferAttribute );
+
+		}
+
+		if ( primitiveDef.indices !== undefined && !geometry.index ) {
+
+			geometry.setIndex( accessors[ primitiveDef.indices ] );
+
+		}
+
+	}
+
 	/**
 	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#geometry
 	 * @param {Array<Object>} primitives
@@ -1880,11 +1992,14 @@ THREE.GLTFLoader = ( function () {
 	 */
 	GLTFParser.prototype.loadGeometries = function ( primitives ) {
 
+		var parser = this;
+		var extensions = this.extensions;
 		var cache = this.primitiveCache;
 
 		return this.getDependencies( 'accessor' ).then( function ( accessors ) {
 
 			var geometries = [];
+			var pending = [];
 
 			for ( var i = 0, il = primitives.length; i < il; i ++ ) {
 
@@ -1893,82 +2008,48 @@ THREE.GLTFLoader = ( function () {
 				// See if we've already created this geometry
 				var cached = getCachedGeometry( cache, primitive );
 
+				var geometry;
+
 				if ( cached ) {
 
 					// Use the cached geometry if it exists
-					geometries.push( cached );
+					pending.push( cached.then( function ( geometry ) {
 
-				} else {
+						geometries.push( geometry );
 
-					// Otherwise create a new geometry
-					var geometry = new THREE.BufferGeometry();
+					} ) );
 
-					var attributes = primitive.attributes;
+				} else if ( primitive.extensions && primitive.extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ] ) {
 
-					for ( var attributeId in attributes ) {
+					// Use DRACO geometry if available
+					var geometryPromise = extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ]
+						.decodePrimitive( primitive, parser )
+						.then( function ( geometry ) {
 
-						var attributeEntry = attributes[ attributeId ];
+							addPrimitiveAttributes( geometry, primitive, accessors );
 
-						var bufferAttribute = accessors[ attributeEntry ];
+							geometries.push( geometry );
 
-						switch ( attributeId ) {
+							return geometry;
 
-							case 'POSITION':
+						} );
 
-								geometry.addAttribute( 'position', bufferAttribute );
-								break;
-
-							case 'NORMAL':
+					cache.push( { primitive: primitive, promise: geometryPromise  } );
 
-								geometry.addAttribute( 'normal', bufferAttribute );
-								break;
+					pending.push( geometryPromise );
 
-							case 'TEXCOORD_0':
-							case 'TEXCOORD0':
-							case 'TEXCOORD':
-
-								geometry.addAttribute( 'uv', bufferAttribute );
-								break;
+				} else  {
 
-							case 'TEXCOORD_1':
-
-								geometry.addAttribute( 'uv2', bufferAttribute );
-								break;
-
-							case 'COLOR_0':
-							case 'COLOR0':
-							case 'COLOR':
-
-								geometry.addAttribute( 'color', bufferAttribute );
-								break;
-
-							case 'WEIGHTS_0':
-							case 'WEIGHT': // WEIGHT semantic deprecated.
-
-								geometry.addAttribute( 'skinWeight', bufferAttribute );
-								break;
-
-							case 'JOINTS_0':
-							case 'JOINT': // JOINT semantic deprecated.
-
-								geometry.addAttribute( 'skinIndex', bufferAttribute );
-								break;
-
-						}
-
-					}
-
-					if ( primitive.indices !== undefined ) {
-
-						geometry.setIndex( accessors[ primitive.indices ] );
+					// Otherwise create a new geometry
+					geometry = new THREE.BufferGeometry();
 
-					}
+					addPrimitiveAttributes( geometry, primitive, accessors );
 
 					// Cache this geometry
 					cache.push( {
 
 						primitive: primitive,
-						geometry: geometry
+						promise: Promise.resolve( geometry )
 
 					} );
 
@@ -1978,7 +2059,11 @@ THREE.GLTFLoader = ( function () {
 
 			}
 
-			return geometries;
+			return Promise.all( pending ).then( function () {
+
+				return geometries;
+
+			} );
 
 		} );
 

examples/js/loaders/draco/DRACOLoader.js

@@ -24,8 +24,6 @@ THREE.DRACOLoader = function(manager) {
     this.verbosity = 0;
     this.attributeOptions = {};
     this.drawMode = THREE.TrianglesDrawMode;
-    // User defined unique id for attributes.
-    this.attributeUniqueIdMap = {};
     // Native Draco attribute type to Three.JS attribute type.
     this.nativeAttributeMap = {
       'position' : 'POSITION',
@@ -104,14 +102,15 @@ THREE.DRACOLoader.prototype = {
      */
     decodeDracoFile: function(rawBuffer, callback, attributeUniqueIdMap) {
       var scope = this;
-      this.attributeUniqueIdMap = attributeUniqueIdMap || {};
       THREE.DRACOLoader.getDecoderModule()
           .then( function ( module ) {
-            scope.decodeDracoFileInternal( rawBuffer, module.decoder, callback );
+            scope.decodeDracoFileInternal( rawBuffer, module.decoder, callback,
+              attributeUniqueIdMap || {});
           });
     },
 
-    decodeDracoFileInternal: function(rawBuffer, dracoDecoder, callback) {
+    decodeDracoFileInternal: function(rawBuffer, dracoDecoder, callback,
+                                      attributeUniqueIdMap) {
       /*
        * Here is how to use Draco Javascript decoder and get the geometry.
        */
@@ -137,7 +136,7 @@ THREE.DRACOLoader.prototype = {
         throw new Error(errorMsg);
       }
       callback(this.convertDracoGeometryTo3JS(dracoDecoder, decoder,
-          geometryType, buffer));
+          geometryType, buffer, attributeUniqueIdMap));
     },
 
     addAttributeToGeometry: function(dracoDecoder, decoder, dracoGeometry,
@@ -168,7 +167,7 @@ THREE.DRACOLoader.prototype = {
     },
 
     convertDracoGeometryTo3JS: function(dracoDecoder, decoder, geometryType,
-                                        buffer) {
+                                        buffer, attributeUniqueIdMap) {
         if (this.getAttributeOptions('position').skipDequantization === true) {
           decoder.SkipAttributeTransform(dracoDecoder.POSITION);
         }
@@ -236,7 +235,7 @@ THREE.DRACOLoader.prototype = {
         for (var attributeName in this.nativeAttributeMap) {
           // The native attribute type is only used when no unique Id is
           // provided. For example, loading .drc files.
-          if (this.attributeUniqueIdMap[attributeName] === undefined) {
+          if (attributeUniqueIdMap[attributeName] === undefined) {
             var attId = decoder.GetAttributeId(dracoGeometry,
                 dracoDecoder[this.nativeAttributeMap[attributeName]]);
             if (attId !== -1) {
@@ -251,8 +250,8 @@ THREE.DRACOLoader.prototype = {
         }
 
         // Add attributes of user specified unique id. E.g. GLTF models.
-        for (var attributeName in this.attributeUniqueIdMap) {
-          var attributeId = this.attributeUniqueIdMap[attributeName];
+        for (var attributeName in attributeUniqueIdMap) {
+          var attributeId = attributeUniqueIdMap[attributeName];
           var attribute = decoder.GetAttributeByUniqueId(dracoGeometry,
                                                          attributeId);
           this.addAttributeToGeometry(dracoDecoder, decoder, dracoGeometry,
@@ -353,18 +352,26 @@ THREE.DRACOLoader.setDecoderPath = function ( path ) {
 THREE.DRACOLoader.setDecoderConfig = function ( config ) {
   var wasmBinary = THREE.DRACOLoader.decoderConfig.wasmBinary;
   THREE.DRACOLoader.decoderConfig = config || {};
-  THREE.DRACOLoader.decoderModulePromise = null;
+  THREE.DRACOLoader.releaseDecoderModule();
 
   // Reuse WASM binary.
   if ( wasmBinary ) THREE.DRACOLoader.decoderConfig.wasmBinary = wasmBinary;
 };
 
- /**
-  * Gets WebAssembly or asm.js singleton instance of DracoDecoderModule
-  * after testing for browser support. Returns Promise that resolves when
-  * module is available.
-  * @return {Promise<{decoder: DracoDecoderModule}>}
-  */
+/**
+ * Releases the singleton DracoDecoderModule instance. Module will be recreated
+ * with the next decoding call.
+ */
+THREE.DRACOLoader.releaseDecoderModule = function () {
+  THREE.DRACOLoader.decoderModulePromise = null;
+};
+
+/**
+ * Gets WebAssembly or asm.js singleton instance of DracoDecoderModule
+ * after testing for browser support. Returns Promise that resolves when
+ * module is available.
+ * @return {Promise<{decoder: DracoDecoderModule}>}
+ */
 THREE.DRACOLoader.getDecoderModule = function () {
   var scope = this;
   var path = THREE.DRACOLoader.decoderPath;

examples/js/loaders/draco/gltf/draco_wasm_wrapper.js

@@ -0,0 +1,115 @@
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examples/models/gltf/CesiumMan/glTF-Draco/CesiumMan.gltf

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examples/models/gltf/CesiumMilkTruck/glTF-Draco/CesiumMilkTruck.gltf

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examples/models/gltf/RiggedSimple/glTF-Draco/RiggedSimple.gltf

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+    {
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+        0,
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+        -9.947898149675895e-8,
+        -0.00029137087403796613,
+        -0.999997854232788
+      ],
+      "scale": [
+        1,
+        1,
+        1.0000001192092896
+      ]
+    },
+    {
+      "children": [
+        2
+      ]
+    }
+  ],
+  "meshes": [
+    {
+      "primitives": [
+        {
+          "attributes": {
+            "JOINTS_0": 10,
+            "NORMAL": 11,
+            "POSITION": 12,
+            "WEIGHTS_0": 13
+          },
+          "indices": 9,
+          "mode": 4,
+          "material": 0,
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+                "NORMAL": 1,
+                "POSITION": 2,
+                "WEIGHTS_0": 3
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+          }
+        }
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+      "name": "Cylinder"
+    }
+  ],
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+      "channels": [
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+          "target": {
+            "node": 2,
+            "path": "translation"
+          }
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+            "path": "rotation"
+          }
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+        {
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+            "path": "scale"
+          }
+        },
+        {
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+            "node": 3,
+            "path": "translation"
+          }
+        },
+        {
+          "sampler": 4,
+          "target": {
+            "node": 3,
+            "path": "rotation"
+          }
+        },
+        {
+          "sampler": 5,
+          "target": {
+            "node": 3,
+            "path": "scale"
+          }
+        }
+      ],
+      "samplers": [
+        {
+          "input": 0,
+          "interpolation": "LINEAR",
+          "output": 1
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+        {
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+          "interpolation": "LINEAR",
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+        }
+      ]
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+  ],
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+      "inverseBindMatrices": 8,
+      "skeleton": 2,
+      "joints": [
+        2,
+        3
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+    }
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+  ],
+  "materials": [
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+        "baseColorFactor": [
+          0.27963539958000183,
+          0.6399999856948853,
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+          1
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+        "metallicFactor": 0
+      },
+      "emissiveFactor": [
+        0,
+        0,
+        0
+      ],
+      "name": "Material_001-effect"
+    }
+  ],
+  "bufferViews": [
+    {
+      "buffer": 0,
+      "byteOffset": 0,
+      "byteLength": 24
+    },
+    {
+      "buffer": 0,
+      "byteOffset": 24,
+      "byteLength": 144
+    },
+    {
+      "buffer": 0,
+      "byteOffset": 168,
+      "byteLength": 96
+    },
+    {
+      "buffer": 0,
+      "byteOffset": 264,
+      "byteLength": 128
+    },
+    {
+      "buffer": 0,
+      "byteOffset": 392,
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+    }
+  ],
+  "buffers": [
+    {
+      "byteLength": 1400,
+      "uri": "0.bin"
+    }
+  ],
+  "extensionsRequired": [
+    "KHR_draco_mesh_compression"
+  ],
+  "extensionsUsed": [
+    "KHR_draco_mesh_compression"
+  ]
+}

examples/webgl_loader_draco.html

@@ -90,6 +90,9 @@
 				mesh.receiveShadow = true;
 				scene.add( mesh );
 
+				// Release decoder resources.
+				THREE.DRACOLoader.releaseDecoderModule();
+
 			} );
 
 			// renderer

examples/webgl_loader_gltf_extensions.html

@@ -90,11 +90,13 @@
 				<option value="glTF-Embedded">None (Embedded)</option>
 				<option value="glTF-Binary">None (Binary)</option>
 				<option value="glTF-pbrSpecularGlossiness">Specular-Glossiness (PBR)</option>
+				<option value="glTF-Draco">Draco (Compressed)</option>
 			</select>
 		</div>
 	</div>
 		<script src="../build/three.js"></script>
 		<script src="js/controls/OrbitControls.js"></script>
+		<script src="js/loaders/draco/DRACOLoader.js"></script>
 		<script src="js/loaders/GLTFLoader.js"></script>
 
 		<script>
@@ -204,6 +206,9 @@
 
 				loader = new THREE.GLTFLoader();
 
+				THREE.DRACOLoader.setDecoderPath( 'js/loaders/draco/gltf/' );
+				loader.setDRACOLoader( new THREE.DRACOLoader() );
+
 				for (var i = 0; i < extensionSelect.children.length; i++) {
 					var child = extensionSelect.children[i];
 					child.disabled = sceneInfo.extensions.indexOf(child.value) === -1;
@@ -445,7 +450,7 @@
 					addLights:true,
 					addGround:true,
 					shadows:true,
-					extensions: ['glTF', 'glTF-Embedded', 'glTF-pbrSpecularGlossiness', 'glTF-Binary']
+					extensions: ['glTF', 'glTF-Embedded', 'glTF-pbrSpecularGlossiness', 'glTF-Binary', 'glTF-Draco']
 				},
 				{
 					name : "Monster", url : "./models/gltf/Monster/%s/Monster.gltf",
@@ -457,16 +462,16 @@
 					addLights:true,
 					shadows:true,
 					addGround:true,
-					extensions: ['glTF', 'glTF-Embedded', 'glTF-pbrSpecularGlossiness', 'glTF-Binary']
+					extensions: ['glTF', 'glTF-Embedded', 'glTF-pbrSpecularGlossiness', 'glTF-Binary', 'glTF-Draco']
 				},
 				{
 					name : "Cesium Man", url : "./models/gltf/CesiumMan/%s/CesiumMan.gltf",
-					 cameraPos: new THREE.Vector3(0, 3, 10),
-					 objectRotation: new THREE.Euler(0, 0, 0),
-					 addLights:true,
-					 addGround:true,
-					 shadows:true,
-					extensions: ['glTF', 'glTF-Embedded', 'glTF-pbrSpecularGlossiness', 'glTF-Binary']
+					cameraPos: new THREE.Vector3(0, 3, 10),
+					objectRotation: new THREE.Euler(0, 0, 0),
+					addLights:true,
+					addGround:true,
+					shadows:true,
+					extensions: ['glTF', 'glTF-Embedded', 'glTF-pbrSpecularGlossiness', 'glTF-Binary', 'glTF-Draco']
 				},
 				{
 					name : "Cesium Milk Truck",
@@ -475,7 +480,7 @@
 					addLights:true,
 					addGround:true,
 					shadows:true,
-					extensions: ['glTF', 'glTF-Embedded', 'glTF-pbrSpecularGlossiness', 'glTF-Binary']
+					extensions: ['glTF', 'glTF-Embedded', 'glTF-pbrSpecularGlossiness', 'glTF-Binary', 'glTF-Draco']
 				},
 				{
 					name : "Rigged Simple",
@@ -484,7 +489,7 @@
 					objectRotation: new THREE.Euler(0, 90, 0),
 					addLights:true,
 					shadows:true,
-					extensions: ['glTF', 'glTF-Embedded', 'glTF-pbrSpecularGlossiness', 'glTF-Binary']
+					extensions: ['glTF', 'glTF-Embedded', 'glTF-pbrSpecularGlossiness', 'glTF-Binary', 'glTF-Draco']
 				},
 				{
 					name : 'Outlined Box',