GLTFLoader: some code to be accessible from extensions on parser (#26126)

examples/jsm/loaders/GLTFLoader.js

@@ -3857,6 +3857,7 @@ class GLTFParser {
 	loadAnimation( animationIndex ) {
 
 		const json = this.json;
+		const parser = this;
 
 		const animationDef = json.animations[ animationIndex ];
 		const animationName = animationDef.name ? animationDef.name : 'animation_' + animationIndex;
@@ -3914,103 +3915,23 @@ class GLTFParser {
 
 				if ( node === undefined ) continue;
 
-				node.updateMatrix();
-
-				let TypedKeyframeTrack;
-
-				switch ( PATH_PROPERTIES[ target.path ] ) {
-
-					case PATH_PROPERTIES.weights:
-
-						TypedKeyframeTrack = NumberKeyframeTrack;
-						break;
-
-					case PATH_PROPERTIES.rotation:
-
-						TypedKeyframeTrack = QuaternionKeyframeTrack;
-						break;
-
-					case PATH_PROPERTIES.position:
-					case PATH_PROPERTIES.scale:
-					default:
-
-						TypedKeyframeTrack = VectorKeyframeTrack;
-						break;
-
-				}
-
-				const targetName = node.name ? node.name : node.uuid;
-
-				const interpolation = sampler.interpolation !== undefined ? INTERPOLATION[ sampler.interpolation ] : InterpolateLinear;
-
-				const targetNames = [];
-
-				if ( PATH_PROPERTIES[ target.path ] === PATH_PROPERTIES.weights ) {
-
-					node.traverse( function ( object ) {
-
-						if ( object.morphTargetInfluences ) {
-
-							targetNames.push( object.name ? object.name : object.uuid );
-
-						}
-
-					} );
-
-				} else {
-
-					targetNames.push( targetName );
+				if ( node.updateMatrix ) {
 
-				}
-
-				let outputArray = outputAccessor.array;
-
-				if ( outputAccessor.normalized ) {
-
-					const scale = getNormalizedComponentScale( outputArray.constructor );
-					const scaled = new Float32Array( outputArray.length );
-
-					for ( let j = 0, jl = outputArray.length; j < jl; j ++ ) {
-
-						scaled[ j ] = outputArray[ j ] * scale;
-
-					}
-
-					outputArray = scaled;
+					node.updateMatrix();
+					node.matrixAutoUpdate = true;
 
 				}
 
-				for ( let j = 0, jl = targetNames.length; j < jl; j ++ ) {
-
-					const track = new TypedKeyframeTrack(
-						targetNames[ j ] + '.' + PATH_PROPERTIES[ target.path ],
-						inputAccessor.array,
-						outputArray,
-						interpolation
-					);
-
-					// Override interpolation with custom factory method.
-					if ( sampler.interpolation === 'CUBICSPLINE' ) {
-
-						track.createInterpolant = function InterpolantFactoryMethodGLTFCubicSpline( result ) {
+				const createdTracks = parser._createAnimationTracks( node, inputAccessor, outputAccessor, sampler, target );
 
-							// A CUBICSPLINE keyframe in glTF has three output values for each input value,
-							// representing inTangent, splineVertex, and outTangent. As a result, track.getValueSize()
-							// must be divided by three to get the interpolant's sampleSize argument.
+				if ( createdTracks ) {
 
-							const interpolantType = ( this instanceof QuaternionKeyframeTrack ) ? GLTFCubicSplineQuaternionInterpolant : GLTFCubicSplineInterpolant;
+					for ( let k = 0; k < createdTracks.length; k ++ ) {
 
-							return new interpolantType( this.times, this.values, this.getValueSize() / 3, result );
-
-						};
-
-						// Mark as CUBICSPLINE. `track.getInterpolation()` doesn't support custom interpolants.
-						track.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline = true;
+						tracks.push( createdTracks[ k ] );
 
 					}
 
-					tracks.push( track );
-
 				}
 
 			}
@@ -4341,6 +4262,135 @@ class GLTFParser {
 
 	}
 
+	_createAnimationTracks( node, inputAccessor, outputAccessor, sampler, target ) {
+
+		const tracks = [];
+
+		const targetName = node.name ? node.name : node.uuid;
+
+		const targetNames = [];
+
+		if ( PATH_PROPERTIES[ target.path ] === PATH_PROPERTIES.weights ) {
+
+			node.traverse( function ( object ) {
+
+				if ( object.morphTargetInfluences ) {
+
+					targetNames.push( object.name ? object.name : object.uuid );
+
+				}
+
+			} );
+
+		} else {
+
+			targetNames.push( targetName );
+
+		}
+
+		let TypedKeyframeTrack;
+
+		switch ( PATH_PROPERTIES[ target.path ] ) {
+
+			case PATH_PROPERTIES.weights:
+
+				TypedKeyframeTrack = NumberKeyframeTrack;
+				break;
+
+			case PATH_PROPERTIES.rotation:
+
+				TypedKeyframeTrack = QuaternionKeyframeTrack;
+				break;
+
+			case PATH_PROPERTIES.position:
+			case PATH_PROPERTIES.scale:
+			default:
+				switch ( outputAccessor.itemSize ) {
+
+					case 1:
+						TypedKeyframeTrack = NumberKeyframeTrack;
+						break;
+					case 2:
+					case 3:
+						TypedKeyframeTrack = VectorKeyframeTrack;
+						break;
+
+				}
+
+				break;
+
+		}
+
+		const interpolation = sampler.interpolation !== undefined ? INTERPOLATION[ sampler.interpolation ] : InterpolateLinear;
+
+		const outputArray = this._getArrayFromAccessor( outputAccessor );
+
+		for ( let j = 0, jl = targetNames.length; j < jl; j ++ ) {
+
+			const track = new TypedKeyframeTrack(
+				targetNames[ j ] + '.' + PATH_PROPERTIES[ target.path ],
+				inputAccessor.array,
+				outputArray,
+				interpolation
+			);
+
+			// Override interpolation with custom factory method.
+			if ( interpolation === 'CUBICSPLINE' ) {
+
+				this._createCubicSplineTrackInterpolant( track );
+
+			}
+
+			tracks.push( track );
+
+		}
+
+		return tracks;
+
+	}
+
+	_getArrayFromAccessor( accessor ) {
+
+		let outputArray = accessor.array;
+
+		if ( accessor.normalized ) {
+
+			const scale = getNormalizedComponentScale( outputArray.constructor );
+			const scaled = new Float32Array( outputArray.length );
+
+			for ( let j = 0, jl = outputArray.length; j < jl; j ++ ) {
+
+				scaled[ j ] = outputArray[ j ] * scale;
+
+			}
+
+			outputArray = scaled;
+
+		}
+
+		return outputArray;
+
+	}
+
+	_createCubicSplineTrackInterpolant( track ) {
+
+		track.createInterpolant = function InterpolantFactoryMethodGLTFCubicSpline( result ) {
+
+			// A CUBICSPLINE keyframe in glTF has three output values for each input value,
+			// representing inTangent, splineVertex, and outTangent. As a result, track.getValueSize()
+			// must be divided by three to get the interpolant's sampleSize argument.
+
+			const interpolantType = ( this instanceof QuaternionKeyframeTrack ) ? GLTFCubicSplineQuaternionInterpolant : GLTFCubicSplineInterpolant;
+
+			return new interpolantType( this.times, this.values, this.getValueSize() / 3, result );
+
+		};
+
+		// Mark as CUBICSPLINE. `track.getInterpolation()` doesn't support custom interpolants.
+		track.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline = true;
+
+	}
+
 }
 
 /**