genBuffers method

dynamic genBuffers(dynamic geoInfo)

Implementation

genBuffers( geoInfo ) {

	var buffers = {
		"vertex": [],
		"normal": [],
		"colors": [],
		"uvs": [],
		"materialIndex": [],
		"vertexWeights": [],
		"weightsIndices": [],
	};

	var polygonIndex = 0;
	var faceLength = 0;
	var displayedWeightsWarning = false;

	// these will hold data for a single face
	var facePositionIndexes = [];
	var faceNormals = [];
	var faceColors = [];
	var faceUVs = [];
	var faceWeights = [];
	var faceWeightIndices = [];

	var scope = this;
	geoInfo["vertexIndices"].asMap().forEach( ( polygonVertexIndex, vertexIndex ) {

		var materialIndex;
		var endOfFace = false;

		// Face index and vertex index arrays are combined in a single array
		// A cube with quad faces looks like this:
		// PolygonVertexIndex: *24 {
		//  a: 0, 1, 3, -3, 2, 3, 5, -5, 4, 5, 7, -7, 6, 7, 1, -1, 1, 7, 5, -4, 6, 0, 2, -5
		//  }
		// Negative numbers mark the end of a face - first face here is 0, 1, 3, -3
		// to find index of last vertex bit shift the index: ^ - 1
		if ( vertexIndex < 0 ) {

			vertexIndex = vertexIndex ^ - 1; // equivalent to ( x * -1 ) - 1
			endOfFace = true;

		}

		var weightIndices = [];
		var weights = [];

		facePositionIndexes.addAll( [vertexIndex * 3, vertexIndex * 3 + 1, vertexIndex * 3 + 2] );

		if ( geoInfo["color"] != null ) {

			var data = getData( polygonVertexIndex, polygonIndex, vertexIndex, geoInfo["color"] );

			faceColors.addAll( [data[ 0 ], data[ 1 ], data[ 2 ]] );

		}

		if ( geoInfo["skeleton"] != null ) {

			if ( geoInfo["weightTable"][ vertexIndex ] != null ) {

				geoInfo["weightTable"][ vertexIndex ].forEach( ( wt ) {

					weights.add( wt["weight"] );
					weightIndices.add( wt["id"] );

				} );


			}

			if ( weights.length > 4 ) {

				if ( ! displayedWeightsWarning ) {

					print( 'THREE.FBXLoader: Vertex has more than 4 skinning weights assigned to vertex. Deleting additional weights.' );
					displayedWeightsWarning = true;

				}

				var wIndex = [ 0, 0, 0, 0 ];
				var Weight = [ 0, 0, 0, 0 ];

				weights.asMap().forEach( ( weightIndex, weight ) {

					var currentWeight = weight;
					var currentIndex = weightIndices[ weightIndex ];

            var comparedWeightArray = Weight;

					Weight.asMap().forEach( ( comparedWeightIndex, comparedWeight ) {

						if ( currentWeight > comparedWeight ) {

							comparedWeightArray[ comparedWeightIndex ] = currentWeight;
							currentWeight = comparedWeight;

							var tmp = wIndex[ comparedWeightIndex ];
							wIndex[ comparedWeightIndex ] = currentIndex;
							currentIndex = tmp;

						}

					} );

				} );

				weightIndices = wIndex;
				weights = Weight;

			}

			// if the weight array is shorter than 4 pad with 0s
			while ( weights.length < 4 ) {

				weights.add( 0 );
				weightIndices.add( 0 );

			}

			for ( var i = 0; i < 4; ++ i ) {

				faceWeights.add( weights[ i ] );
				faceWeightIndices.add( weightIndices[ i ] );

			}

		}

		if ( geoInfo["normal"] != null ) {

			var data = getData( polygonVertexIndex, polygonIndex, vertexIndex, geoInfo["normal"] );

			faceNormals.addAll([ data[ 0 ], data[ 1 ], data[ 2 ] ]);

		}

		if ( geoInfo["material"] != null && geoInfo["material"]["mappingType"] != 'AllSame' ) {

			materialIndex = getData( polygonVertexIndex, polygonIndex, vertexIndex, geoInfo["material"] )[ 0 ];

		}

		if ( geoInfo["uv"] != null ) {

			geoInfo["uv"].asMap().forEach( ( i, uv ) {

				var data = getData( polygonVertexIndex, polygonIndex, vertexIndex, uv );

				if ( faceUVs.length == i ) {

					faceUVs.add( [] );

				}

				faceUVs[ i ].add( data[ 0 ] );
				faceUVs[ i ].add( data[ 1 ] );

			} );

		}

		faceLength ++;

		if ( endOfFace ) {

			scope.genFace( buffers, geoInfo, facePositionIndexes, materialIndex, faceNormals, faceColors, faceUVs, faceWeights, faceWeightIndices, faceLength );

			polygonIndex ++;
			faceLength = 0;

			// reset arrays for the next face
			facePositionIndexes = [];
			faceNormals = [];
			faceColors = [];
			faceUVs = [];
			faceWeights = [];
			faceWeightIndices = [];

		}

	} );

	return buffers;

}