ColladaLoader: Better support of textured/non-textured materials

examples/js/loaders/ColladaLoader.js

@@ -2044,7 +2044,8 @@ THREE.ColladaLoader.prototype = {
 				material: xml.getAttribute( 'material' ),
 				count: parseInt( xml.getAttribute( 'count' ) ),
 				inputs: {},
-				stride: 0
+				stride: 0,
+				hasUV: false
 			};
 
 			for ( var i = 0, l = xml.childNodes.length; i < l; i ++ ) {
@@ -2061,6 +2062,7 @@ THREE.ColladaLoader.prototype = {
 						var offset = parseInt( child.getAttribute( 'offset' ) );
 						primitive.inputs[ semantic ] = { id: id, offset: offset };
 						primitive.stride = Math.max( primitive.stride, offset + 1 );
+						if ( semantic === 'TEXCOORD' ) primitive.hasUV = true;
 						break;
 
 					case 'vcount':
@@ -2097,6 +2099,30 @@ THREE.ColladaLoader.prototype = {
 
 		}
 
+		function checkUVCoordinates( primitives ) {
+
+			var count = 0;
+
+			for ( var i = 0, l = primitives.length; i < l; i ++ ) {
+
+				var primitive = primitives[ i ];
+
+				if ( primitive.hasUV === true ) {
+
+					count ++;
+
+				}
+
+			}
+
+			if ( count > 0 && count < primitives.length ) {
+
+				primitives.uvsNeedsFix = true;
+
+			}
+
+		}
+
 		function buildGeometry( data ) {
 
 			var build = {};
@@ -2114,9 +2140,15 @@ THREE.ColladaLoader.prototype = {
 
 			for ( var type in groupedPrimitives ) {
 
-				// second, we create for each type of primitives (polylist,triangles or lines) a buffer geometry
+				var primitiveType = groupedPrimitives[ type ];
+
+				// second, ensure consistent uv coordinates for each type of primitives (polylist,triangles or lines)
+
+				checkUVCoordinates( primitiveType );
 
-				build[ type ] = buildGeometryType( groupedPrimitives[ type ], sources, vertices );
+				// third, create a buffer geometry for each type of primitives
+
+				build[ type ] = buildGeometryType( primitiveType, sources, vertices );
 
 			}
 
@@ -2193,6 +2225,7 @@ THREE.ColladaLoader.prototype = {
 								switch ( key ) {
 
 									case 'POSITION':
+										var prevLength = position.array.length;
 										buildGeometryData( primitive, sources[ id ], input.offset, position.array );
 										position.stride = sources[ id ].stride;
 
@@ -2201,6 +2234,22 @@ THREE.ColladaLoader.prototype = {
 											buildGeometryData( primitive, sources.skinIndices, input.offset, skinIndex.array );
 											buildGeometryData( primitive, sources.skinWeights, input.offset, skinWeight.array );
 
+										}
+
+										// see #3803
+
+										if ( primitive.hasUV === false && primitives.uvsNeedsFix === true ) {
+
+											var count = ( position.array.length - prevLength ) / position.stride;
+
+											for ( var i = 0; i < count; i ++ ) {
+
+												// fill missing uv coordinates
+
+												uv.array.push( 0, 0 );
+
+											}
+
 										}
 										break;