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50 lines
2.8 KiB
50 lines
2.8 KiB
2 years ago
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( function () {
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/**
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* ------------------------------------------------------------------------------------------
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* Subsurface Scattering shader
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* Based on GDC 2011 – Approximating Translucency for a Fast, Cheap and Convincing Subsurface Scattering Look
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* https://colinbarrebrisebois.com/2011/03/07/gdc-2011-approximating-translucency-for-a-fast-cheap-and-convincing-subsurface-scattering-look/
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*------------------------------------------------------------------------------------------
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*/
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function replaceAll( string, find, replace ) {
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return string.split( find ).join( replace );
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}
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const meshphong_frag_head = THREE.ShaderChunk[ 'meshphong_frag' ].slice( 0, THREE.ShaderChunk[ 'meshphong_frag' ].indexOf( 'void main() {' ) );
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const meshphong_frag_body = THREE.ShaderChunk[ 'meshphong_frag' ].slice( THREE.ShaderChunk[ 'meshphong_frag' ].indexOf( 'void main() {' ) );
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const SubsurfaceScatteringShader = {
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uniforms: THREE.UniformsUtils.merge( [ THREE.ShaderLib[ 'phong' ].uniforms, {
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'thicknessMap': {
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value: null
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},
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'thicknessColor': {
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value: new THREE.Color( 0xffffff )
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},
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'thicknessDistortion': {
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value: 0.1
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},
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'thicknessAmbient': {
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value: 0.0
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},
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'thicknessAttenuation': {
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value: 0.1
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},
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'thicknessPower': {
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value: 2.0
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},
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'thicknessScale': {
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value: 10.0
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}
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} ] ),
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vertexShader: [ '#define USE_UV', THREE.ShaderChunk[ 'meshphong_vert' ] ].join( '\n' ),
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fragmentShader: [ '#define USE_UV', '#define SUBSURFACE', meshphong_frag_head, 'uniform sampler2D thicknessMap;', 'uniform float thicknessPower;', 'uniform float thicknessScale;', 'uniform float thicknessDistortion;', 'uniform float thicknessAmbient;', 'uniform float thicknessAttenuation;', 'uniform vec3 thicknessColor;', 'void RE_Direct_Scattering(const in IncidentLight directLight, const in vec2 uv, const in GeometricContext geometry, inout ReflectedLight reflectedLight) {', ' vec3 thickness = thicknessColor * texture2D(thicknessMap, uv).r;', ' vec3 scatteringHalf = normalize(directLight.direction + (geometry.normal * thicknessDistortion));', ' float scatteringDot = pow(saturate(dot(geometry.viewDir, -scatteringHalf)), thicknessPower) * thicknessScale;', ' vec3 scatteringIllu = (scatteringDot + thicknessAmbient) * thickness;', ' reflectedLight.directDiffuse += scatteringIllu * thicknessAttenuation * directLight.color;', '}', meshphong_frag_body.replace( '#include <lights_fragment_begin>', replaceAll( THREE.ShaderChunk[ 'lights_fragment_begin' ], 'RE_Direct( directLight, geometry, material, reflectedLight );', [ 'RE_Direct( directLight, geometry, material, reflectedLight );', '#if defined( SUBSURFACE ) && defined( USE_UV )', ' RE_Direct_Scattering(directLight, vUv, geometry, reflectedLight);', '#endif' ].join( '\n' ) ) ) ].join( '\n' )
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};
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THREE.SubsurfaceScatteringShader = SubsurfaceScatteringShader;
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} )();
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