https://github.com/WWBN/AVideo/issues/8713

node_modules/three/examples/js/loaders/BVHLoader.js

@@ -0,0 +1,425 @@
+/**
+ * Description: reads BVH files and outputs a single THREE.Skeleton and an THREE.AnimationClip
+ *
+ * Currently only supports bvh files containing a single root.
+ *
+ */
+
+THREE.BVHLoader = function ( manager ) {
+
+	THREE.Loader.call( this, manager );
+
+	this.animateBonePositions = true;
+	this.animateBoneRotations = true;
+
+};
+
+THREE.BVHLoader.prototype = Object.assign( Object.create( THREE.Loader.prototype ), {
+
+	constructor: THREE.BVHLoader,
+
+	load: function ( url, onLoad, onProgress, onError ) {
+
+		var scope = this;
+
+		var loader = new THREE.FileLoader( scope.manager );
+		loader.setPath( scope.path );
+		loader.setRequestHeader( scope.requestHeader );
+		loader.setWithCredentials( scope.withCredentials );
+		loader.load( url, function ( text ) {
+
+			try {
+
+				onLoad( scope.parse( text ) );
+
+			} catch ( e ) {
+
+				if ( onError ) {
+
+					onError( e );
+
+				} else {
+
+					console.error( e );
+
+				}
+
+				scope.manager.itemError( url );
+
+			}
+
+		}, onProgress, onError );
+
+	},
+
+	parse: function ( text ) {
+
+		/*
+			reads a string array (lines) from a BVH file
+			and outputs a skeleton structure including motion data
+
+			returns thee root node:
+			{ name: '', channels: [], children: [] }
+		*/
+		function readBvh( lines ) {
+
+			// read model structure
+
+			if ( nextLine( lines ) !== 'HIERARCHY' ) {
+
+				console.error( 'THREE.BVHLoader: HIERARCHY expected.' );
+
+			}
+
+			var list = []; // collects flat array of all bones
+			var root = readNode( lines, nextLine( lines ), list );
+
+			// read motion data
+
+			if ( nextLine( lines ) !== 'MOTION' ) {
+
+				console.error( 'THREE.BVHLoader: MOTION expected.' );
+
+			}
+
+			// number of frames
+
+			var tokens = nextLine( lines ).split( /[\s]+/ );
+			var numFrames = parseInt( tokens[ 1 ] );
+
+			if ( isNaN( numFrames ) ) {
+
+				console.error( 'THREE.BVHLoader: Failed to read number of frames.' );
+
+			}
+
+			// frame time
+
+			tokens = nextLine( lines ).split( /[\s]+/ );
+			var frameTime = parseFloat( tokens[ 2 ] );
+
+			if ( isNaN( frameTime ) ) {
+
+				console.error( 'THREE.BVHLoader: Failed to read frame time.' );
+
+			}
+
+			// read frame data line by line
+
+			for ( var i = 0; i < numFrames; i ++ ) {
+
+				tokens = nextLine( lines ).split( /[\s]+/ );
+				readFrameData( tokens, i * frameTime, root );
+
+			}
+
+			return list;
+
+		}
+
+		/*
+			Recursively reads data from a single frame into the bone hierarchy.
+			The passed bone hierarchy has to be structured in the same order as the BVH file.
+			keyframe data is stored in bone.frames.
+
+			- data: splitted string array (frame values), values are shift()ed so
+			this should be empty after parsing the whole hierarchy.
+			- frameTime: playback time for this keyframe.
+			- bone: the bone to read frame data from.
+		*/
+		function readFrameData( data, frameTime, bone ) {
+
+			// end sites have no motion data
+
+			if ( bone.type === 'ENDSITE' ) return;
+
+			// add keyframe
+
+			var keyframe = {
+				time: frameTime,
+				position: new THREE.Vector3(),
+				rotation: new THREE.Quaternion()
+			};
+
+			bone.frames.push( keyframe );
+
+			var quat = new THREE.Quaternion();
+
+			var vx = new THREE.Vector3( 1, 0, 0 );
+			var vy = new THREE.Vector3( 0, 1, 0 );
+			var vz = new THREE.Vector3( 0, 0, 1 );
+
+			// parse values for each channel in node
+
+			for ( var i = 0; i < bone.channels.length; i ++ ) {
+
+				switch ( bone.channels[ i ] ) {
+
+					case 'Xposition':
+						keyframe.position.x = parseFloat( data.shift().trim() );
+						break;
+					case 'Yposition':
+						keyframe.position.y = parseFloat( data.shift().trim() );
+						break;
+					case 'Zposition':
+						keyframe.position.z = parseFloat( data.shift().trim() );
+						break;
+					case 'Xrotation':
+						quat.setFromAxisAngle( vx, parseFloat( data.shift().trim() ) * Math.PI / 180 );
+						keyframe.rotation.multiply( quat );
+						break;
+					case 'Yrotation':
+						quat.setFromAxisAngle( vy, parseFloat( data.shift().trim() ) * Math.PI / 180 );
+						keyframe.rotation.multiply( quat );
+						break;
+					case 'Zrotation':
+						quat.setFromAxisAngle( vz, parseFloat( data.shift().trim() ) * Math.PI / 180 );
+						keyframe.rotation.multiply( quat );
+						break;
+					default:
+						console.warn( 'THREE.BVHLoader: Invalid channel type.' );
+
+				}
+
+			}
+
+			// parse child nodes
+
+			for ( var i = 0; i < bone.children.length; i ++ ) {
+
+				readFrameData( data, frameTime, bone.children[ i ] );
+
+			}
+
+		}
+
+		/*
+		 Recursively parses the HIERACHY section of the BVH file
+
+		 - lines: all lines of the file. lines are consumed as we go along.
+		 - firstline: line containing the node type and name e.g. 'JOINT hip'
+		 - list: collects a flat list of nodes
+
+		 returns: a BVH node including children
+		*/
+		function readNode( lines, firstline, list ) {
+
+			var node = { name: '', type: '', frames: [] };
+			list.push( node );
+
+			// parse node type and name
+
+			var tokens = firstline.split( /[\s]+/ );
+
+			if ( tokens[ 0 ].toUpperCase() === 'END' && tokens[ 1 ].toUpperCase() === 'SITE' ) {
+
+				node.type = 'ENDSITE';
+				node.name = 'ENDSITE'; // bvh end sites have no name
+
+			} else {
+
+				node.name = tokens[ 1 ];
+				node.type = tokens[ 0 ].toUpperCase();
+
+			}
+
+			if ( nextLine( lines ) !== '{' ) {
+
+				console.error( 'THREE.BVHLoader: Expected opening { after type & name' );
+
+			}
+
+			// parse OFFSET
+
+			tokens = nextLine( lines ).split( /[\s]+/ );
+
+			if ( tokens[ 0 ] !== 'OFFSET' ) {
+
+				console.error( 'THREE.BVHLoader: Expected OFFSET but got: ' + tokens[ 0 ] );
+
+			}
+
+			if ( tokens.length !== 4 ) {
+
+				console.error( 'THREE.BVHLoader: Invalid number of values for OFFSET.' );
+
+			}
+
+			var offset = new THREE.Vector3(
+				parseFloat( tokens[ 1 ] ),
+				parseFloat( tokens[ 2 ] ),
+				parseFloat( tokens[ 3 ] )
+			);
+
+			if ( isNaN( offset.x ) || isNaN( offset.y ) || isNaN( offset.z ) ) {
+
+				console.error( 'THREE.BVHLoader: Invalid values of OFFSET.' );
+
+			}
+
+			node.offset = offset;
+
+			// parse CHANNELS definitions
+
+			if ( node.type !== 'ENDSITE' ) {
+
+				tokens = nextLine( lines ).split( /[\s]+/ );
+
+				if ( tokens[ 0 ] !== 'CHANNELS' ) {
+
+					console.error( 'THREE.BVHLoader: Expected CHANNELS definition.' );
+
+				}
+
+				var numChannels = parseInt( tokens[ 1 ] );
+				node.channels = tokens.splice( 2, numChannels );
+				node.children = [];
+
+			}
+
+			// read children
+
+			while ( true ) {
+
+				var line = nextLine( lines );
+
+				if ( line === '}' ) {
+
+					return node;
+
+				} else {
+
+					node.children.push( readNode( lines, line, list ) );
+
+				}
+
+			}
+
+		}
+
+		/*
+			recursively converts the internal bvh node structure to a THREE.Bone hierarchy
+
+			source: the bvh root node
+			list: pass an empty array, collects a flat list of all converted THREE.Bones
+
+			returns the root THREE.Bone
+		*/
+		function toTHREEBone( source, list ) {
+
+			var bone = new THREE.Bone();
+			list.push( bone );
+
+			bone.position.add( source.offset );
+			bone.name = source.name;
+
+			if ( source.type !== 'ENDSITE' ) {
+
+				for ( var i = 0; i < source.children.length; i ++ ) {
+
+					bone.add( toTHREEBone( source.children[ i ], list ) );
+
+				}
+
+			}
+
+			return bone;
+
+		}
+
+		/*
+			builds a THREE.AnimationClip from the keyframe data saved in each bone.
+
+			bone: bvh root node
+
+			returns: a THREE.AnimationClip containing position and quaternion tracks
+		*/
+		function toTHREEAnimation( bones ) {
+
+			var tracks = [];
+
+			// create a position and quaternion animation track for each node
+
+			for ( var i = 0; i < bones.length; i ++ ) {
+
+				var bone = bones[ i ];
+
+				if ( bone.type === 'ENDSITE' )
+					continue;
+
+				// track data
+
+				var times = [];
+				var positions = [];
+				var rotations = [];
+
+				for ( var j = 0; j < bone.frames.length; j ++ ) {
+
+					var frame = bone.frames[ j ];
+
+					times.push( frame.time );
+
+					// the animation system animates the position property,
+					// so we have to add the joint offset to all values
+
+					positions.push( frame.position.x + bone.offset.x );
+					positions.push( frame.position.y + bone.offset.y );
+					positions.push( frame.position.z + bone.offset.z );
+
+					rotations.push( frame.rotation.x );
+					rotations.push( frame.rotation.y );
+					rotations.push( frame.rotation.z );
+					rotations.push( frame.rotation.w );
+
+				}
+
+				if ( scope.animateBonePositions ) {
+
+					tracks.push( new THREE.VectorKeyframeTrack( '.bones[' + bone.name + '].position', times, positions ) );
+
+				}
+
+				if ( scope.animateBoneRotations ) {
+
+					tracks.push( new THREE.QuaternionKeyframeTrack( '.bones[' + bone.name + '].quaternion', times, rotations ) );
+
+				}
+
+			}
+
+			return new THREE.AnimationClip( 'animation', - 1, tracks );
+
+		}
+
+		/*
+			returns the next non-empty line in lines
+		*/
+		function nextLine( lines ) {
+
+			var line;
+			// skip empty lines
+			while ( ( line = lines.shift().trim() ).length === 0 ) { }
+
+			return line;
+
+		}
+
+		var scope = this;
+
+		var lines = text.split( /[\r\n]+/g );
+
+		var bones = readBvh( lines );
+
+		var threeBones = [];
+		toTHREEBone( bones[ 0 ], threeBones );
+
+		var threeClip = toTHREEAnimation( bones );
+
+		return {
+			skeleton: new THREE.Skeleton( threeBones ),
+			clip: threeClip
+		};
+
+	}
+
+} );