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