3d-force-graph.js

  	}

  }

  // Array of scalars
  function setValueV1fArray( gl, v ) {

  	gl.uniform1fv( this.addr, v );

  }

  // Integer / Boolean vectors or arrays thereof (always flat arrays)
  function setValueV1iArray( gl, v ) {

  	gl.uniform1iv( this.addr, v );

  }

  function setValueV2iArray( gl, v ) {

  	gl.uniform2iv( this.addr, v );

  }

  function setValueV3iArray( gl, v ) {

  	gl.uniform3iv( this.addr, v );

  }

  function setValueV4iArray( gl, v ) {

  	gl.uniform4iv( this.addr, v );

  }


  // Array of vectors (flat or from THREE classes)

  function setValueV2fArray( gl, v ) {

  	const data = flatten( v, this.size, 2 );

  	gl.uniform2fv( this.addr, data );

  }

  function setValueV3fArray( gl, v ) {

  	const data = flatten( v, this.size, 3 );

  	gl.uniform3fv( this.addr, data );

  }

  function setValueV4fArray( gl, v ) {

  	const data = flatten( v, this.size, 4 );

  	gl.uniform4fv( this.addr, data );

  }

  // Array of matrices (flat or from THREE clases)

  function setValueM2Array( gl, v ) {

  	const data = flatten( v, this.size, 4 );

  	gl.uniformMatrix2fv( this.addr, false, data );

  }

  function setValueM3Array( gl, v ) {

  	const data = flatten( v, this.size, 9 );

  	gl.uniformMatrix3fv( this.addr, false, data );

  }

  function setValueM4Array( gl, v ) {

  	const data = flatten( v, this.size, 16 );

  	gl.uniformMatrix4fv( this.addr, false, data );

  }

  // Array of textures (2D / Cube)

  function setValueT1Array( gl, v, textures ) {

  	const n = v.length;

  	const units = allocTexUnits( textures, n );

  	gl.uniform1iv( this.addr, units );

  	for ( let i = 0; i !== n; ++ i ) {

  		textures.safeSetTexture2D( v[ i ] || emptyTexture, units[ i ] );

  	}

  }

  function setValueT6Array( gl, v, textures ) {

  	const n = v.length;

  	const units = allocTexUnits( textures, n );

  	gl.uniform1iv( this.addr, units );

  	for ( let i = 0; i !== n; ++ i ) {

  		textures.safeSetTextureCube( v[ i ] || emptyCubeTexture, units[ i ] );

  	}

  }

  // Helper to pick the right setter for a pure (bottom-level) array

  function getPureArraySetter( type ) {

  	switch ( type ) {

  		case 0x1406: return setValueV1fArray; // FLOAT
  		case 0x8b50: return setValueV2fArray; // _VEC2
  		case 0x8b51: return setValueV3fArray; // _VEC3
  		case 0x8b52: return setValueV4fArray; // _VEC4

  		case 0x8b5a: return setValueM2Array; // _MAT2
  		case 0x8b5b: return setValueM3Array; // _MAT3
  		case 0x8b5c: return setValueM4Array; // _MAT4

  		case 0x1404: case 0x8b56: return setValueV1iArray; // INT, BOOL
  		case 0x8b53: case 0x8b57: return setValueV2iArray; // _VEC2
  		case 0x8b54: case 0x8b58: return setValueV3iArray; // _VEC3
  		case 0x8b55: case 0x8b59: return setValueV4iArray; // _VEC4

  		case 0x8b5e: // SAMPLER_2D
  		case 0x8d66: // SAMPLER_EXTERNAL_OES
  		case 0x8dca: // INT_SAMPLER_2D
  		case 0x8dd2: // UNSIGNED_INT_SAMPLER_2D
  		case 0x8b62: // SAMPLER_2D_SHADOW
  			return setValueT1Array;

  		case 0x8b60: // SAMPLER_CUBE
  		case 0x8dcc: // INT_SAMPLER_CUBE
  		case 0x8dd4: // UNSIGNED_INT_SAMPLER_CUBE
  		case 0x8dc5: // SAMPLER_CUBE_SHADOW
  			return setValueT6Array;

  	}

  }

  // --- Uniform Classes ---

  function SingleUniform( id, activeInfo, addr ) {

  	this.id = id;
  	this.addr = addr;
  	this.cache = [];
  	this.setValue = getSingularSetter( activeInfo.type );

  	// this.path = activeInfo.name; // DEBUG

  }

  function PureArrayUniform( id, activeInfo, addr ) {

  	this.id = id;
  	this.addr = addr;
  	this.cache = [];
  	this.size = activeInfo.size;
  	this.setValue = getPureArraySetter( activeInfo.type );

  	// this.path = activeInfo.name; // DEBUG

  }

  PureArrayUniform.prototype.updateCache = function ( data ) {

  	let cache = this.cache;

  	if ( data instanceof Float32Array && cache.length !== data.length ) {

  		this.cache = new Float32Array( data.length );

  	}

  	copyArray( cache, data );

  };

  function StructuredUniform( id ) {

  	this.id = id;

  	this.seq = [];
  	this.map = {};

  }

  StructuredUniform.prototype.setValue = function ( gl, value, textures ) {

  	const seq = this.seq;

  	for ( let i = 0, n = seq.length; i !== n; ++ i ) {

  		const u = seq[ i ];
  		u.setValue( gl, value[ u.id ], textures );

  	}

  };

  // --- Top-level ---

  // Parser - builds up the property tree from the path strings

  const RePathPart = /([\w\d_]+)(\])?(\[|\.)?/g;

  // extracts
  // 	- the identifier (member name or array index)
  //  - followed by an optional right bracket (found when array index)
  //  - followed by an optional left bracket or dot (type of subscript)
  //
  // Note: These portions can be read in a non-overlapping fashion and
  // allow straightforward parsing of the hierarchy that WebGL encodes
  // in the uniform names.

  function addUniform( container, uniformObject ) {

  	container.seq.push( uniformObject );
  	container.map[ uniformObject.id ] = uniformObject;

  }

  function parseUniform( activeInfo, addr, container ) {

  	const path = activeInfo.name,
  		pathLength = path.length;

  	// reset RegExp object, because of the early exit of a previous run
  	RePathPart.lastIndex = 0;

  	while ( true ) {

  		const match = RePathPart.exec( path ),
  			matchEnd = RePathPart.lastIndex;

  		let id = match[ 1 ],
  			idIsIndex = match[ 2 ] === ']',
  			subscript = match[ 3 ];

  		if ( idIsIndex ) id = id | 0; // convert to integer

  		if ( subscript === undefined || subscript === '[' && matchEnd + 2 === pathLength ) {

  			// bare name or "pure" bottom-level array "[0]" suffix

  			addUniform( container, subscript === undefined ?
  				new SingleUniform( id, activeInfo, addr ) :
  				new PureArrayUniform( id, activeInfo, addr ) );

  			break;

  		} else {

  			// step into inner node / create it in case it doesn't exist

  			const map = container.map;
  			let next = map[ id ];

  			if ( next === undefined ) {

  				next = new StructuredUniform( id );
  				addUniform( container, next );

  			}

  			container = next;

  		}

  	}

  }

  // Root Container

  function WebGLUniforms( gl, program ) {

  	this.seq = [];
  	this.map = {};

  	const n = gl.getProgramParameter( program, 35718 );

  	for ( let i = 0; i < n; ++ i ) {

  		const info = gl.getActiveUniform( program, i ),
  			addr = gl.getUniformLocation( program, info.name );

  		parseUniform( info, addr, this );

  	}

  }

  WebGLUniforms.prototype.setValue = function ( gl, name, value, textures ) {

  	const u = this.map[ name ];

  	if ( u !== undefined ) u.setValue( gl, value, textures );

  };

  WebGLUniforms.prototype.setOptional = function ( gl, object, name ) {

  	const v = object[ name ];

  	if ( v !== undefined ) this.setValue( gl, name, v );

  };


  // Static interface

  WebGLUniforms.upload = function ( gl, seq, values, textures ) {

  	for ( let i = 0, n = seq.length; i !== n; ++ i ) {

  		const u = seq[ i ],
  			v = values[ u.id ];

  		if ( v.needsUpdate !== false ) {

  			// note: always updating when .needsUpdate is undefined
  			u.setValue( gl, v.value, textures );

  		}

  	}

  };

  WebGLUniforms.seqWithValue = function ( seq, values ) {

  	const r = [];

  	for ( let i = 0, n = seq.length; i !== n; ++ i ) {

  		const u = seq[ i ];
  		if ( u.id in values ) r.push( u );

  	}

  	return r;

  };

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  function WebGLShader( gl, type, string ) {

  	const shader = gl.createShader( type );

  	gl.shaderSource( shader, string );
  	gl.compileShader( shader );

  	return shader;

  }

  /**
   * @author mrdoob / http://mrdoob.com/
   */

  let programIdCount = 0;

  function addLineNumbers( string ) {

  	const lines = string.split( '\n' );

  	for ( let i = 0; i < lines.length; i ++ ) {

  		lines[ i ] = ( i + 1 ) + ': ' + lines[ i ];

  	}

  	return lines.join( '\n' );

  }

  function getEncodingComponents( encoding ) {

  	switch ( encoding ) {

  		case LinearEncoding:
  			return [ 'Linear', '( value )' ];
  		case sRGBEncoding:
  			return [ 'sRGB', '( value )' ];
  		case RGBEEncoding:
  			return [ 'RGBE', '( value )' ];
  		case RGBM7Encoding:
  			return [ 'RGBM', '( value, 7.0 )' ];
  		case RGBM16Encoding:
  			return [ 'RGBM', '( value, 16.0 )' ];
  		case RGBDEncoding:
  			return [ 'RGBD', '( value, 256.0 )' ];
  		case GammaEncoding:
  			return [ 'Gamma', '( value, float( GAMMA_FACTOR ) )' ];
  		case LogLuvEncoding:
  			return [ 'LogLuv', '( value )' ];
  		default:
  			console.warn( 'THREE.WebGLProgram: Unsupported encoding:', encoding );
  			return [ 'Linear', '( value )' ];

  	}

  }

  function getShaderErrors( gl, shader, type ) {

  	const status = gl.getShaderParameter( shader, 35713 );
  	const log = gl.getShaderInfoLog( shader ).trim();

  	if ( status && log === '' ) return '';

  	// --enable-privileged-webgl-extension
  	// console.log( '**' + type + '**', gl.getExtension( 'WEBGL_debug_shaders' ).getTranslatedShaderSource( shader ) );

  	const source = gl.getShaderSource( shader );

  	return 'THREE.WebGLShader: gl.getShaderInfoLog() ' + type + '\n' + log + addLineNumbers( source );

  }

  function getTexelDecodingFunction( functionName, encoding ) {

  	const components = getEncodingComponents( encoding );
  	return 'vec4 ' + functionName + '( vec4 value ) { return ' + components[ 0 ] + 'ToLinear' + components[ 1 ] + '; }';

  }

  function getTexelEncodingFunction( functionName, encoding ) {

  	const components = getEncodingComponents( encoding );
  	return 'vec4 ' + functionName + '( vec4 value ) { return LinearTo' + components[ 0 ] + components[ 1 ] + '; }';

  }

  function getToneMappingFunction( functionName, toneMapping ) {

  	let toneMappingName;

  	switch ( toneMapping ) {

  		case LinearToneMapping:
  			toneMappingName = 'Linear';
  			break;

  		case ReinhardToneMapping:
  			toneMappingName = 'Reinhard';
  			break;

  		case CineonToneMapping:
  			toneMappingName = 'OptimizedCineon';
  			break;

  		case ACESFilmicToneMapping:
  			toneMappingName = 'ACESFilmic';
  			break;

  		case CustomToneMapping:
  			toneMappingName = 'Custom';
  			break;

  		default:
  			console.warn( 'THREE.WebGLProgram: Unsupported toneMapping:', toneMapping );
  			toneMappingName = 'Linear';

  	}

  	return 'vec3 ' + functionName + '( vec3 color ) { return ' + toneMappingName + 'ToneMapping( color ); }';

  }

  function generateExtensions( parameters ) {

  	const chunks = [
  		( parameters.extensionDerivatives || parameters.envMapCubeUV || parameters.bumpMap || parameters.tangentSpaceNormalMap || parameters.clearcoatNormalMap || parameters.flatShading || parameters.shaderID === 'physical' ) ? '#extension GL_OES_standard_derivatives : enable' : '',
  		( parameters.extensionFragDepth || parameters.logarithmicDepthBuffer ) && parameters.rendererExtensionFragDepth ? '#extension GL_EXT_frag_depth : enable' : '',
  		( parameters.extensionDrawBuffers && parameters.rendererExtensionDrawBuffers ) ? '#extension GL_EXT_draw_buffers : require' : '',
  		( parameters.extensionShaderTextureLOD || parameters.envMap ) && parameters.rendererExtensionShaderTextureLod ? '#extension GL_EXT_shader_texture_lod : enable' : ''
  	];

  	return chunks.filter( filterEmptyLine ).join( '\n' );

  }

  function generateDefines( defines ) {

  	const chunks = [];

  	for ( const name in defines ) {

  		const value = defines[ name ];

  		if ( value === false ) continue;

  		chunks.push( '#define ' + name + ' ' + value );

  	}

  	return chunks.join( '\n' );

  }

  function fetchAttributeLocations( gl, program ) {

  	const attributes = {};

  	const n = gl.getProgramParameter( program, 35721 );

  	for ( let i = 0; i < n; i ++ ) {

  		const info = gl.getActiveAttrib( program, i );
  		const name = info.name;

  		// console.log( 'THREE.WebGLProgram: ACTIVE VERTEX ATTRIBUTE:', name, i );

  		attributes[ name ] = gl.getAttribLocation( program, name );

  	}

  	return attributes;

  }

  function filterEmptyLine( string ) {

  	return string !== '';

  }

  function replaceLightNums( string, parameters ) {

  	return string
  		.replace( /NUM_DIR_LIGHTS/g, parameters.numDirLights )
  		.replace( /NUM_SPOT_LIGHTS/g, parameters.numSpotLights )
  		.replace( /NUM_RECT_AREA_LIGHTS/g, parameters.numRectAreaLights )
  		.replace( /NUM_POINT_LIGHTS/g, parameters.numPointLights )
  		.replace( /NUM_HEMI_LIGHTS/g, parameters.numHemiLights )
  		.replace( /NUM_DIR_LIGHT_SHADOWS/g, parameters.numDirLightShadows )
  		.replace( /NUM_SPOT_LIGHT_SHADOWS/g, parameters.numSpotLightShadows )
  		.replace( /NUM_POINT_LIGHT_SHADOWS/g, parameters.numPointLightShadows );

  }

  function replaceClippingPlaneNums( string, parameters ) {

  	return string
  		.replace( /NUM_CLIPPING_PLANES/g, parameters.numClippingPlanes )
  		.replace( /UNION_CLIPPING_PLANES/g, ( parameters.numClippingPlanes - parameters.numClipIntersection ) );

  }

  // Resolve Includes

  const includePattern = /^[ \t]*#include +<([\w\d./]+)>/gm;

  function resolveIncludes( string ) {

  	return string.replace( includePattern, includeReplacer );

  }

  function includeReplacer( match, include ) {

  	const string = ShaderChunk[ include ];

  	if ( string === undefined ) {

  		throw new Error( 'Can not resolve #include <' + include + '>' );

  	}

  	return resolveIncludes( string );

  }

  // Unroll Loops

  const deprecatedUnrollLoopPattern = /#pragma unroll_loop[\s]+?for \( int i \= (\d+)\; i < (\d+)\; i \+\+ \) \{([\s\S]+?)(?=\})\}/g;
  const unrollLoopPattern = /#pragma unroll_loop_start[\s]+?for \( int i \= (\d+)\; i < (\d+)\; i \+\+ \) \{([\s\S]+?)(?=\})\}[\s]+?#pragma unroll_loop_end/g;

  function unrollLoops( string ) {

  	return string
  		.replace( unrollLoopPattern, loopReplacer )
  		.replace( deprecatedUnrollLoopPattern, deprecatedLoopReplacer );

  }

  function deprecatedLoopReplacer( match, start, end, snippet ) {

  	console.warn( 'WebGLProgram: #pragma unroll_loop shader syntax is deprecated. Please use #pragma unroll_loop_start syntax instead.' );
  	return loopReplacer( match, start, end, snippet );

  }

  function loopReplacer( match, start, end, snippet ) {

  	let string = '';

  	for ( let i = parseInt( start ); i < parseInt( end ); i ++ ) {

  		string += snippet
  			.replace( /\[ i \]/g, '[ ' + i + ' ]' )
  			.replace( /UNROLLED_LOOP_INDEX/g, i );

  	}

  	return string;

  }

  //

  function generatePrecision( parameters ) {

  	let precisionstring = "precision " + parameters.precision + " float;\nprecision " + parameters.precision + " int;";

  	if ( parameters.precision === "highp" ) {

  		precisionstring += "\n#define HIGH_PRECISION";

  	} else if ( parameters.precision === "mediump" ) {

  		precisionstring += "\n#define MEDIUM_PRECISION";

  	} else if ( parameters.precision === "lowp" ) {

  		precisionstring += "\n#define LOW_PRECISION";

  	}

  	return precisionstring;

  }

  function generateShadowMapTypeDefine( parameters ) {

  	let shadowMapTypeDefine = 'SHADOWMAP_TYPE_BASIC';

  	if ( parameters.shadowMapType === PCFShadowMap ) {

  		shadowMapTypeDefine = 'SHADOWMAP_TYPE_PCF';

  	} else if ( parameters.shadowMapType === PCFSoftShadowMap ) {

  		shadowMapTypeDefine = 'SHADOWMAP_TYPE_PCF_SOFT';

  	} else if ( parameters.shadowMapType === VSMShadowMap ) {

  		shadowMapTypeDefine = 'SHADOWMAP_TYPE_VSM';

  	}

  	return shadowMapTypeDefine;

  }

  function generateEnvMapTypeDefine( parameters ) {

  	let envMapTypeDefine = 'ENVMAP_TYPE_CUBE';

  	if ( parameters.envMap ) {

  		switch ( parameters.envMapMode ) {

  			case CubeReflectionMapping:
  			case CubeRefractionMapping:
  				envMapTypeDefine = 'ENVMAP_TYPE_CUBE';
  				break;

  			case CubeUVReflectionMapping:
  			case CubeUVRefractionMapping:
  				envMapTypeDefine = 'ENVMAP_TYPE_CUBE_UV';
  				break;

  			case EquirectangularReflectionMapping:
  			case EquirectangularRefractionMapping:
  				envMapTypeDefine = 'ENVMAP_TYPE_EQUIREC';
  				break;

  		}

  	}

  	return envMapTypeDefine;

  }

  function generateEnvMapModeDefine( parameters ) {

  	let envMapModeDefine = 'ENVMAP_MODE_REFLECTION';

  	if ( parameters.envMap ) {

  		switch ( parameters.envMapMode ) {

  			case CubeRefractionMapping:
  			case EquirectangularRefractionMapping:
  				envMapModeDefine = 'ENVMAP_MODE_REFRACTION';
  				break;

  		}

  	}

  	return envMapModeDefine;

  }

  function generateEnvMapBlendingDefine( parameters ) {

  	let envMapBlendingDefine = 'ENVMAP_BLENDING_NONE';

  	if ( parameters.envMap ) {

  		switch ( parameters.combine ) {

  			case MultiplyOperation:
  				envMapBlendingDefine = 'ENVMAP_BLENDING_MULTIPLY';
  				break;

  			case MixOperation:
  				envMapBlendingDefine = 'ENVMAP_BLENDING_MIX';
  				break;

  			case AddOperation:
  				envMapBlendingDefine = 'ENVMAP_BLENDING_ADD';
  				break;

  		}

  	}

  	return envMapBlendingDefine;

  }

  function WebGLProgram( renderer, cacheKey, parameters, bindingStates ) {

  	const gl = renderer.getContext();

  	const defines = parameters.defines;

  	let vertexShader = parameters.vertexShader;
  	let fragmentShader = parameters.fragmentShader;

  	const shadowMapTypeDefine = generateShadowMapTypeDefine( parameters );
  	const envMapTypeDefine = generateEnvMapTypeDefine( parameters );
  	const envMapModeDefine = generateEnvMapModeDefine( parameters );
  	const envMapBlendingDefine = generateEnvMapBlendingDefine( parameters );


  	const gammaFactorDefine = ( renderer.gammaFactor > 0 ) ? renderer.gammaFactor : 1.0;

  	const customExtensions = parameters.isWebGL2 ? '' : generateExtensions( parameters );

  	const customDefines = generateDefines( defines );

  	const program = gl.createProgram();

  	let prefixVertex, prefixFragment;

  	if ( parameters.isRawShaderMaterial ) {

  		prefixVertex = [

  			customDefines

  		].filter( filterEmptyLine ).join( '\n' );

  		if ( prefixVertex.length > 0 ) {

  			prefixVertex += '\n';

  		}

  		prefixFragment = [

  			customExtensions,
  			customDefines

  		].filter( filterEmptyLine ).join( '\n' );

  		if ( prefixFragment.length > 0 ) {

  			prefixFragment += '\n';

  		}

  	} else {

  		prefixVertex = [

  			generatePrecision( parameters ),

  			'#define SHADER_NAME ' + parameters.shaderName,

  			customDefines,

  			parameters.instancing ? '#define USE_INSTANCING' : '',
  			parameters.supportsVertexTextures ? '#define VERTEX_TEXTURES' : '',

  			'#define GAMMA_FACTOR ' + gammaFactorDefine,

  			'#define MAX_BONES ' + parameters.maxBones,
  			( parameters.useFog && parameters.fog ) ? '#define USE_FOG' : '',
  			( parameters.useFog && parameters.fogExp2 ) ? '#define FOG_EXP2' : '',

  			parameters.map ? '#define USE_MAP' : '',
  			parameters.envMap ? '#define USE_ENVMAP' : '',
  			parameters.envMap ? '#define ' + envMapModeDefine : '',
  			parameters.lightMap ? '#define USE_LIGHTMAP' : '',
  			parameters.aoMap ? '#define USE_AOMAP' : '',
  			parameters.emissiveMap ? '#define USE_EMISSIVEMAP' : '',
  			parameters.bumpMap ? '#define USE_BUMPMAP' : '',
  			parameters.normalMap ? '#define USE_NORMALMAP' : '',
  			( parameters.normalMap && parameters.objectSpaceNormalMap ) ? '#define OBJECTSPACE_NORMALMAP' : '',
  			( parameters.normalMap && parameters.tangentSpaceNormalMap ) ? '#define TANGENTSPACE_NORMALMAP' : '',

  			parameters.clearcoatMap ? '#define USE_CLEARCOATMAP' : '',
  			parameters.clearcoatRoughnessMap ? '#define USE_CLEARCOAT_ROUGHNESSMAP' : '',
  			parameters.clearcoatNormalMap ? '#define USE_CLEARCOAT_NORMALMAP' : '',
  			parameters.displacementMap && parameters.supportsVertexTextures ? '#define USE_DISPLACEMENTMAP' : '',
  			parameters.specularMap ? '#define USE_SPECULARMAP' : '',
  			parameters.roughnessMap ? '#define USE_ROUGHNESSMAP' : '',
  			parameters.metalnessMap ? '#define USE_METALNESSMAP' : '',
  			parameters.alphaMap ? '#define USE_ALPHAMAP' : '',

  			parameters.vertexTangents ? '#define USE_TANGENT' : '',
  			parameters.vertexColors ? '#define USE_COLOR' : '',
  			parameters.vertexUvs ? '#define USE_UV' : '',
  			parameters.uvsVertexOnly ? '#define UVS_VERTEX_ONLY' : '',

  			parameters.flatShading ? '#define FLAT_SHADED' : '',

  			parameters.skinning ? '#define USE_SKINNING' : '',
  			parameters.useVertexTexture ? '#define BONE_TEXTURE' : '',

  			parameters.morphTargets ? '#define USE_MORPHTARGETS' : '',
  			parameters.morphNormals && parameters.flatShading === false ? '#define USE_MORPHNORMALS' : '',
  			parameters.doubleSided ? '#define DOUBLE_SIDED' : '',
  			parameters.flipSided ? '#define FLIP_SIDED' : '',

  			parameters.shadowMapEnabled ? '#define USE_SHADOWMAP' : '',
  			parameters.shadowMapEnabled ? '#define ' + shadowMapTypeDefine : '',

  			parameters.sizeAttenuation ? '#define USE_SIZEATTENUATION' : '',

  			parameters.logarithmicDepthBuffer ? '#define USE_LOGDEPTHBUF' : '',
  			( parameters.logarithmicDepthBuffer && parameters.rendererExtensionFragDepth ) ? '#define USE_LOGDEPTHBUF_EXT' : '',

  			'uniform mat4 modelMatrix;',
  			'uniform mat4 modelViewMatrix;',
  			'uniform mat4 projectionMatrix;',
  			'uniform mat4 viewMatrix;',
  			'uniform mat3 normalMatrix;',
  			'uniform vec3 cameraPosition;',
  			'uniform bool isOrthographic;',

  			'#ifdef USE_INSTANCING',

  			' attribute mat4 instanceMatrix;',

  			'#endif',

  			'attribute vec3 position;',
  			'attribute vec3 normal;',
  			'attribute vec2 uv;',

  			'#ifdef USE_TANGENT',

  			'	attribute vec4 tangent;',

  			'#endif',

  			'#ifdef USE_COLOR',

  			'	attribute vec3 color;',

  			'#endif',

  			'#ifdef USE_MORPHTARGETS',

  			'	attribute vec3 morphTarget0;',
  			'	attribute vec3 morphTarget1;',
  			'	attribute vec3 morphTarget2;',
  			'	attribute vec3 morphTarget3;',

  			'	#ifdef USE_MORPHNORMALS',

  			'		attribute vec3 morphNormal0;',
  			'		attribute vec3 morphNormal1;',
  			'		attribute vec3 morphNormal2;',
  			'		attribute vec3 morphNormal3;',

  			'	#else',

  			'		attribute vec3 morphTarget4;',
  			'		attribute vec3 morphTarget5;',
  			'		attribute vec3 morphTarget6;',
  			'		attribute vec3 morphTarget7;',

  			'	#endif',

  			'#endif',

  			'#ifdef USE_SKINNING',

  			'	attribute vec4 skinIndex;',
  			'	attribute vec4 skinWeight;',

  			'#endif',

  			'\n'

  		].filter( filterEmptyLine ).join( '\n' );

  		prefixFragment = [

  			customExtensions,

  			generatePrecision( parameters ),

  			'#define SHADER_NAME ' + parameters.shaderName,

  			customDefines,

  			parameters.alphaTest ? '#define ALPHATEST ' + parameters.alphaTest + ( parameters.alphaTest % 1 ? '' : '.0' ) : '', // add '.0' if integer

  			'#define GAMMA_FACTOR ' + gammaFactorDefine,

  			( parameters.useFog && parameters.fog ) ? '#define USE_FOG' : '',
  			( parameters.useFog && parameters.fogExp2 ) ? '#define FOG_EXP2' : '',

  			parameters.map ? '#define USE_MAP' : '',
  			parameters.matcap ? '#define USE_MATCAP' : '',
  			parameters.envMap ? '#define USE_ENVMAP' : '',
  			parameters.envMap ? '#define ' + envMapTypeDefine : '',
  			parameters.envMap ? '#define ' + envMapModeDefine : '',
  			parameters.envMap ? '#define ' + envMapBlendingDefine : '',
  			parameters.lightMap ? '#define USE_LIGHTMAP' : '',
  			parameters.aoMap ? '#define USE_AOMAP' : '',
  			parameters.emissiveMap ? '#define USE_EMISSIVEMAP' : '',
  			parameters.bumpMap ? '#define USE_BUMPMAP' : '',
  			parameters.normalMap ? '#define USE_NORMALMAP' : '',
  			( parameters.normalMap && parameters.objectSpaceNormalMap ) ? '#define OBJECTSPACE_NORMALMAP' : '',
  			( parameters.normalMap && parameters.tangentSpaceNormalMap ) ? '#define TANGENTSPACE_NORMALMAP' : '',
  			parameters.clearcoatMap ? '#define USE_CLEARCOATMAP' : '',
  			parameters.clearcoatRoughnessMap ? '#define USE_CLEARCOAT_ROUGHNESSMAP' : '',
  			parameters.clearcoatNormalMap ? '#define USE_CLEARCOAT_NORMALMAP' : '',
  			parameters.specularMap ? '#define USE_SPECULARMAP' : '',
  			parameters.roughnessMap ? '#define USE_ROUGHNESSMAP' : '',
  			parameters.metalnessMap ? '#define USE_METALNESSMAP' : '',
  			parameters.alphaMap ? '#define USE_ALPHAMAP' : '',

  			parameters.sheen ? '#define USE_SHEEN' : '',

  			parameters.vertexTangents ? '#define USE_TANGENT' : '',
  			parameters.vertexColors ? '#define USE_COLOR' : '',
  			parameters.vertexUvs ? '#define USE_UV' : '',
  			parameters.uvsVertexOnly ? '#define UVS_VERTEX_ONLY' : '',

  			parameters.gradientMap ? '#define USE_GRADIENTMAP' : '',

  			parameters.flatShading ? '#define FLAT_SHADED' : '',

  			parameters.doubleSided ? '#define DOUBLE_SIDED' : '',
  			parameters.flipSided ? '#define FLIP_SIDED' : '',

  			parameters.shadowMapEnabled ? '#define USE_SHADOWMAP' : '',
  			parameters.shadowMapEnabled ? '#define ' + shadowMapTypeDefine : '',

  			parameters.premultipliedAlpha ? '#define PREMULTIPLIED_ALPHA' : '',

  			parameters.physicallyCorrectLights ? '#define PHYSICALLY_CORRECT_LIGHTS' : '',