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- // http://download.autodesk.com/us/systemdocs/help/2011/lustre/index.html?url=./files/WSc4e151a45a3b785a24c3d9a411df9298473-7ffd.htm,topicNumber=d0e9492
- // https://community.foundry.com/discuss/topic/103636/format-spec-for-3dl?mode=Post&postID=895258
- import {
- ClampToEdgeWrapping,
- Data3DTexture,
- FileLoader,
- FloatType,
- LinearFilter,
- Loader,
- RGBAFormat,
- UnsignedByteType,
- } from 'three';
- export class LUT3dlLoader extends Loader {
- constructor( manager ) {
- super( manager );
- this.type = UnsignedByteType;
- }
- setType( type ) {
- if ( type !== UnsignedByteType && type !== FloatType ) {
- throw new Error( 'LUT3dlLoader: Unsupported type' );
- }
- this.type = type;
- return this;
- }
- load( url, onLoad, onProgress, onError ) {
- const loader = new FileLoader( this.manager );
- loader.setPath( this.path );
- loader.setResponseType( 'text' );
- loader.load( url, text => {
- try {
- onLoad( this.parse( text ) );
- } catch ( e ) {
- if ( onError ) {
- onError( e );
- } else {
- console.error( e );
- }
- this.manager.itemError( url );
- }
- }, onProgress, onError );
- }
- parse( input ) {
- const regExpGridInfo = /^[\d ]+$/m;
- const regExpDataPoints = /^([\d.e+-]+) +([\d.e+-]+) +([\d.e+-]+) *$/gm;
- // The first line describes the positions of values on the LUT grid.
- let result = regExpGridInfo.exec( input );
- if ( result === null ) {
- throw new Error( 'LUT3dlLoader: Missing grid information' );
- }
- const gridLines = result[ 0 ].trim().split( /\s+/g ).map( Number );
- const gridStep = gridLines[ 1 ] - gridLines[ 0 ];
- const size = gridLines.length;
- const sizeSq = size ** 2;
- for ( let i = 1, l = gridLines.length; i < l; ++ i ) {
- if ( gridStep !== ( gridLines[ i ] - gridLines[ i - 1 ] ) ) {
- throw new Error( 'LUT3dlLoader: Inconsistent grid size' );
- }
- }
- const dataFloat = new Float32Array( size ** 3 * 4 );
- let maxValue = 0.0;
- let index = 0;
- while ( ( result = regExpDataPoints.exec( input ) ) !== null ) {
- const r = Number( result[ 1 ] );
- const g = Number( result[ 2 ] );
- const b = Number( result[ 3 ] );
- maxValue = Math.max( maxValue, r, g, b );
- const bLayer = index % size;
- const gLayer = Math.floor( index / size ) % size;
- const rLayer = Math.floor( index / ( sizeSq ) ) % size;
- // b grows first, then g, then r.
- const d4 = ( bLayer * sizeSq + gLayer * size + rLayer ) * 4;
- dataFloat[ d4 + 0 ] = r;
- dataFloat[ d4 + 1 ] = g;
- dataFloat[ d4 + 2 ] = b;
- ++ index;
- }
- // Determine the bit depth to scale the values to [0.0, 1.0].
- const bits = Math.ceil( Math.log2( maxValue ) );
- const maxBitValue = Math.pow( 2, bits );
- const data = this.type === UnsignedByteType ? new Uint8Array( dataFloat.length ) : dataFloat;
- const scale = this.type === UnsignedByteType ? 255 : 1;
- for ( let i = 0, l = data.length; i < l; i += 4 ) {
- const i1 = i + 1;
- const i2 = i + 2;
- const i3 = i + 3;
- // Note: data is dataFloat when type is FloatType.
- data[ i ] = dataFloat[ i ] / maxBitValue * scale;
- data[ i1 ] = dataFloat[ i1 ] / maxBitValue * scale;
- data[ i2 ] = dataFloat[ i2 ] / maxBitValue * scale;
- data[ i3 ] = scale;
- }
- const texture3D = new Data3DTexture();
- texture3D.image.data = data;
- texture3D.image.width = size;
- texture3D.image.height = size;
- texture3D.image.depth = size;
- texture3D.format = RGBAFormat;
- texture3D.type = this.type;
- texture3D.magFilter = LinearFilter;
- texture3D.minFilter = LinearFilter;
- texture3D.wrapS = ClampToEdgeWrapping;
- texture3D.wrapT = ClampToEdgeWrapping;
- texture3D.wrapR = ClampToEdgeWrapping;
- texture3D.generateMipmaps = false;
- texture3D.needsUpdate = true;
- return {
- size,
- texture3D,
- };
- }
- }
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