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取自 WebGlLights.js r168

setup

for ( let i = 0, l = lights.length; i < l; i ++ ) {const light = lights[ i ];const color = light.color;
const intensity = light.intensity;
const distance = light.distance;const shadowMap = ( light.shadow && light.shadow.map ) ? light.shadow.map.texture : null;if ( light.isAmbientLight ) {r += color.r * intensity;g += color.g * intensity;b += color.b * intensity;} else if ( light.isLightProbe ) {for ( let j = 0; j < 9; j ++ ) {state.probe[ j ].addScaledVector( light.sh.coefficients[ j ], intensity );}numLightProbes ++;} else if ( light.isDirectionalLight ) {const uniforms = cache.get( light );uniforms.color.copy( light.color ).multiplyScalar( light.intensity );if ( light.castShadow ) {const shadow = light.shadow;const shadowUniforms = shadowCache.get( light );shadowUniforms.shadowIntensity = shadow.intensity;shadowUniforms.shadowBias = shadow.bias;shadowUniforms.shadowNormalBias = shadow.normalBias;shadowUniforms.shadowRadius = shadow.radius;shadowUniforms.shadowMapSize = shadow.mapSize;state.directionalShadow[ directionalLength ] = shadowUniforms;state.directionalShadowMap[ directionalLength ] = shadowMap;state.directionalShadowMatrix[ directionalLength ] = light.shadow.matrix;numDirectionalShadows ++;}state.directional[ directionalLength ] = uniforms;directionalLength ++;} else if ( light.isSpotLight ) {const uniforms = cache.get( light );uniforms.position.setFromMatrixPosition( light.matrixWorld );uniforms.color.copy( color ).multiplyScalar( intensity );uniforms.distance = distance;uniforms.coneCos = Math.cos( light.angle );uniforms.penumbraCos = Math.cos( light.angle * ( 1 - light.penumbra ) );uniforms.decay = light.decay;state.spot[ spotLength ] = uniforms;const shadow = light.shadow;if ( light.map ) {state.spotLightMap[ numSpotMaps ] = light.map;numSpotMaps ++;// make sure the lightMatrix is up to date// TODO : do it if required onlyshadow.updateMatrices( light );if ( light.castShadow ) numSpotShadowsWithMaps ++;}state.spotLightMatrix[ spotLength ] = shadow.matrix;if ( light.castShadow ) {const shadowUniforms = shadowCache.get( light );shadowUniforms.shadowIntensity = shadow.intensity;shadowUniforms.shadowBias = shadow.bias;shadowUniforms.shadowNormalBias = shadow.normalBias;shadowUniforms.shadowRadius = shadow.radius;shadowUniforms.shadowMapSize = shadow.mapSize;state.spotShadow[ spotLength ] = shadowUniforms;state.spotShadowMap[ spotLength ] = shadowMap;numSpotShadows ++;}spotLength ++;} else if ( light.isRectAreaLight ) {const uniforms = cache.get( light );uniforms.color.copy( color ).multiplyScalar( intensity );uniforms.halfWidth.set( light.width * 0.5, 0.0, 0.0 );uniforms.halfHeight.set( 0.0, light.height * 0.5, 0.0 );state.rectArea[ rectAreaLength ] = uniforms;rectAreaLength ++;} else if ( light.isPointLight ) {const uniforms = cache.get( light );uniforms.color.copy( light.color ).multiplyScalar( light.intensity );uniforms.distance = light.distance;uniforms.decay = light.decay;if ( light.castShadow ) {const shadow = light.shadow;const shadowUniforms = shadowCache.get( light );shadowUniforms.shadowIntensity = shadow.intensity;shadowUniforms.shadowBias = shadow.bias;shadowUniforms.shadowNormalBias = shadow.normalBias;shadowUniforms.shadowRadius = shadow.radius;shadowUniforms.shadowMapSize = shadow.mapSize;shadowUniforms.shadowCameraNear = shadow.camera.near;shadowUniforms.shadowCameraFar = shadow.camera.far;state.pointShadow[ pointLength ] = shadowUniforms;state.pointShadowMap[ pointLength ] = shadowMap;state.pointShadowMatrix[ pointLength ] = light.shadow.matrix;numPointShadows ++;}state.point[ pointLength ] = uniforms;pointLength ++;} else if ( light.isHemisphereLight ) {const uniforms = cache.get( light );uniforms.skyColor.copy( light.color ).multiplyScalar( intensity );uniforms.groundColor.copy( light.groundColor ).multiplyScalar( intensity );state.hemi[ hemiLength ] = uniforms;hemiLength ++;}

setupView （每次渲染scene都会执行） * viewMatrix

function setupView( lights, camera ) {let directionalLength = 0;let pointLength = 0;let spotLength = 0;let rectAreaLength = 0;let hemiLength = 0;const viewMatrix = camera.matrixWorldInverse;for ( let i = 0, l = lights.length; i < l; i ++ ) {const light = lights[ i ];if ( light.isDirectionalLight ) {const uniforms = state.directional[ directionalLength ];uniforms.direction.setFromMatrixPosition( light.matrixWorld );vector3.setFromMatrixPosition( light.target.matrixWorld );uniforms.direction.sub( vector3 );uniforms.direction.transformDirection( viewMatrix );directionalLength ++;} else if ( light.isSpotLight ) {const uniforms = state.spot[ spotLength ];uniforms.position.setFromMatrixPosition( light.matrixWorld );uniforms.position.applyMatrix4( viewMatrix );uniforms.direction.setFromMatrixPosition( light.matrixWorld );vector3.setFromMatrixPosition( light.target.matrixWorld );uniforms.direction.sub( vector3 );uniforms.direction.transformDirection( viewMatrix );spotLength ++;} else if ( light.isRectAreaLight ) {const uniforms = state.rectArea[ rectAreaLength ];uniforms.position.setFromMatrixPosition( light.matrixWorld );uniforms.position.applyMatrix4( viewMatrix );// extract local rotation of light to derive width/height half vectorsmatrix42.identity();matrix4.copy( light.matrixWorld );matrix4.premultiply( viewMatrix );matrix42.extractRotation( matrix4 );uniforms.halfWidth.set( light.width * 0.5, 0.0, 0.0 );uniforms.halfHeight.set( 0.0, light.height * 0.5, 0.0 );uniforms.halfWidth.applyMatrix4( matrix42 );uniforms.halfHeight.applyMatrix4( matrix42 );rectAreaLength ++;} else if ( light.isPointLight ) {const uniforms = state.point[ pointLength ];uniforms.position.setFromMatrixPosition( light.matrixWorld );uniforms.position.applyMatrix4( viewMatrix );pointLength ++;} else if ( light.isHemisphereLight ) {const uniforms = state.hemi[ hemiLength ];uniforms.direction.setFromMatrixPosition( light.matrixWorld );uniforms.direction.transformDirection( viewMatrix );hemiLength ++;}}}