最新代码

public/sdk/three/jsm/loaders/IESLoader.js

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+import {
+	DataTexture,
+	FileLoader,
+	FloatType,
+	RedFormat,
+	MathUtils,
+	Loader,
+	UnsignedByteType,
+	LinearFilter,
+	HalfFloatType,
+	DataUtils
+} from 'three';
+
+class IESLoader extends Loader {
+
+	constructor( manager ) {
+
+		super( manager );
+
+		this.type = HalfFloatType;
+
+	}
+
+	_getIESValues( iesLamp, type ) {
+
+		const width = 360;
+		const height = 180;
+		const size = width * height;
+
+		const data = new Array( size );
+
+		function interpolateCandelaValues( phi, theta ) {
+
+			let phiIndex = 0, thetaIndex = 0;
+			let startTheta = 0, endTheta = 0, startPhi = 0, endPhi = 0;
+
+			for ( let i = 0; i < iesLamp.numHorAngles - 1; ++ i ) { // numHorAngles = horAngles.length-1 because of extra padding, so this wont cause an out of bounds error
+
+				if ( theta < iesLamp.horAngles[ i + 1 ] || i == iesLamp.numHorAngles - 2 ) {
+
+					thetaIndex = i;
+					startTheta = iesLamp.horAngles[ i ];
+					endTheta = iesLamp.horAngles[ i + 1 ];
+
+					break;
+
+				}
+
+			}
+
+			for ( let i = 0; i < iesLamp.numVerAngles - 1; ++ i ) {
+
+				if ( phi < iesLamp.verAngles[ i + 1 ] || i == iesLamp.numVerAngles - 2 ) {
+
+					phiIndex = i;
+					startPhi = iesLamp.verAngles[ i ];
+					endPhi = iesLamp.verAngles[ i + 1 ];
+
+					break;
+
+				}
+
+			}
+
+			const deltaTheta = endTheta - startTheta;
+			const deltaPhi = endPhi - startPhi;
+
+			if ( deltaPhi === 0 ) // Outside range
+				return 0;
+
+			const t1 = deltaTheta === 0 ? 0 : ( theta - startTheta ) / deltaTheta;
+			const t2 = ( phi - startPhi ) / deltaPhi;
+
+			const nextThetaIndex = deltaTheta === 0 ? thetaIndex : thetaIndex + 1;
+
+			const v1 = MathUtils.lerp( iesLamp.candelaValues[ thetaIndex ][ phiIndex ], iesLamp.candelaValues[ nextThetaIndex ][ phiIndex ], t1 );
+			const v2 = MathUtils.lerp( iesLamp.candelaValues[ thetaIndex ][ phiIndex + 1 ], iesLamp.candelaValues[ nextThetaIndex ][ phiIndex + 1 ], t1 );
+			const v = MathUtils.lerp( v1, v2, t2 );
+
+			return v;
+
+		}
+
+		const startTheta = iesLamp.horAngles[ 0 ], endTheta = iesLamp.horAngles[ iesLamp.numHorAngles - 1 ];
+
+		for ( let i = 0; i < size; ++ i ) {
+
+			let theta = i % width;
+			const phi = Math.floor( i / width );
+
+			if ( endTheta - startTheta !== 0 && ( theta < startTheta || theta >= endTheta ) ) { // Handle symmetry for hor angles
+
+				theta %= endTheta * 2;
+
+				if ( theta > endTheta )
+					theta = endTheta * 2 - theta;
+
+			}
+
+			data[ phi + theta * height ] = interpolateCandelaValues( phi, theta );
+
+		}
+
+		let result = null;
+
+		if ( type === UnsignedByteType ) result = Uint8Array.from( data.map( v => Math.min( v * 0xFF, 0xFF ) ) );
+		else if ( type === HalfFloatType ) result = Uint16Array.from( data.map( v => DataUtils.toHalfFloat( v ) ) );
+		else if ( type === FloatType ) result = Float32Array.from( data );
+		else console.error( 'IESLoader: Unsupported type:', type );
+
+		return result;
+
+	}
+
+	load( url, onLoad, onProgress, onError ) {
+
+		const loader = new FileLoader( this.manager );
+		loader.setResponseType( 'text' );
+		loader.setCrossOrigin( this.crossOrigin );
+		loader.setWithCredentials( this.withCredentials );
+		loader.setPath( this.path );
+		loader.setRequestHeader( this.requestHeader );
+
+		loader.load( url, text => {
+
+			onLoad( this.parse( text ) );
+
+		}, onProgress, onError );
+
+	}
+
+	parse( text ) {
+
+		const type = this.type;
+
+		const iesLamp = new IESLamp( text );
+		const data = this._getIESValues( iesLamp, type );
+
+		const texture = new DataTexture( data, 180, 1, RedFormat, type );
+		texture.minFilter = LinearFilter;
+		texture.magFilter = LinearFilter;
+		texture.needsUpdate = true;
+
+		return texture;
+
+	}
+
+}
+
+
+function IESLamp( text ) {
+
+	const _self = this;
+
+	const textArray = text.split( '\n' );
+
+	let lineNumber = 0;
+	let line;
+
+	_self.verAngles = [ ];
+	_self.horAngles = [ ];
+
+	_self.candelaValues = [ ];
+
+	_self.tiltData = { };
+	_self.tiltData.angles = [ ];
+	_self.tiltData.mulFactors = [ ];
+
+	function textToArray( text ) {
+
+		text = text.replace( /^\s+|\s+$/g, '' ); // remove leading or trailing spaces
+		text = text.replace( /,/g, ' ' ); // replace commas with spaces
+		text = text.replace( /\s\s+/g, ' ' ); // replace white space/tabs etc by single whitespace
+
+		const array = text.split( ' ' );
+
+		return array;
+
+	}
+
+	function readArray( count, array ) {
+
+		while ( true ) {
+
+			const line = textArray[ lineNumber ++ ];
+			const lineData = textToArray( line );
+
+			for ( let i = 0; i < lineData.length; ++ i ) {
+
+				array.push( Number( lineData[ i ] ) );
+
+			}
+
+			if ( array.length === count )
+				break;
+
+		}
+
+	}
+
+	function readTilt() {
+
+		let line = textArray[ lineNumber ++ ];
+		let lineData = textToArray( line );
+
+		_self.tiltData.lampToLumGeometry = Number( lineData[ 0 ] );
+
+		line = textArray[ lineNumber ++ ];
+		lineData = textToArray( line );
+
+		_self.tiltData.numAngles = Number( lineData[ 0 ] );
+
+		readArray( _self.tiltData.numAngles, _self.tiltData.angles );
+		readArray( _self.tiltData.numAngles, _self.tiltData.mulFactors );
+
+	}
+
+	function readLampValues() {
+
+		const values = [ ];
+		readArray( 10, values );
+
+		_self.count = Number( values[ 0 ] );
+		_self.lumens = Number( values[ 1 ] );
+		_self.multiplier = Number( values[ 2 ] );
+		_self.numVerAngles = Number( values[ 3 ] );
+		_self.numHorAngles = Number( values[ 4 ] );
+		_self.gonioType = Number( values[ 5 ] );
+		_self.units = Number( values[ 6 ] );
+		_self.width = Number( values[ 7 ] );
+		_self.length = Number( values[ 8 ] );
+		_self.height = Number( values[ 9 ] );
+
+	}
+
+	function readLampFactors() {
+
+		const values = [ ];
+		readArray( 3, values );
+
+		_self.ballFactor = Number( values[ 0 ] );
+		_self.blpFactor = Number( values[ 1 ] );
+		_self.inputWatts = Number( values[ 2 ] );
+
+	}
+
+	while ( true ) {
+
+		line = textArray[ lineNumber ++ ];
+
+		if ( line.includes( 'TILT' ) ) {
+
+			break;
+
+		}
+
+	}
+
+	if ( ! line.includes( 'NONE' ) ) {
+
+		if ( line.includes( 'INCLUDE' ) ) {
+
+			readTilt();
+
+		} else {
+
+			// TODO:: Read tilt data from a file
+
+		}
+
+	}
+
+	readLampValues();
+
+	readLampFactors();
+
+	// Initialize candela value array
+	for ( let i = 0; i < _self.numHorAngles; ++ i ) {
+
+		_self.candelaValues.push( [ ] );
+
+	}
+
+	// Parse Angles
+	readArray( _self.numVerAngles, _self.verAngles );
+	readArray( _self.numHorAngles, _self.horAngles );
+
+	// Parse Candela values
+	for ( let i = 0; i < _self.numHorAngles; ++ i ) {
+
+		readArray( _self.numVerAngles, _self.candelaValues[ i ] );
+
+	}
+
+	// Calculate actual candela values, and normalize.
+	for ( let i = 0; i < _self.numHorAngles; ++ i ) {
+
+		for ( let j = 0; j < _self.numVerAngles; ++ j ) {
+
+			_self.candelaValues[ i ][ j ] *= _self.candelaValues[ i ][ j ] * _self.multiplier
+				* _self.ballFactor * _self.blpFactor;
+
+		}
+
+	}
+
+	let maxVal = - 1;
+	for ( let i = 0; i < _self.numHorAngles; ++ i ) {
+
+		for ( let j = 0; j < _self.numVerAngles; ++ j ) {
+
+			const value = _self.candelaValues[ i ][ j ];
+			maxVal = maxVal < value ? value : maxVal;
+
+		}
+
+	}
+
+	const bNormalize = true;
+	if ( bNormalize && maxVal > 0 ) {
+
+		for ( let i = 0; i < _self.numHorAngles; ++ i ) {
+
+			for ( let j = 0; j < _self.numVerAngles; ++ j ) {
+
+				_self.candelaValues[ i ][ j ] /= maxVal;
+
+			}
+
+		}
+
+	}
+
+}
+
+
+export { IESLoader };