85 lines
2.5 KiB
JavaScript
85 lines
2.5 KiB
JavaScript
import { addNodeMaterial } from './NodeMaterial.js';
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import { transformedNormalView } from '../accessors/NormalNode.js';
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import { positionViewDirection } from '../accessors/PositionNode.js';
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import PhysicalLightingModel from '../functions/PhysicalLightingModel.js';
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import MeshPhysicalNodeMaterial from './MeshPhysicalNodeMaterial.js';
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import { float, vec3 } from '../shadernode/ShaderNode.js';
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class SSSLightingModel extends PhysicalLightingModel {
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constructor( useClearcoat, useSheen, useIridescence, useSSS ) {
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super( useClearcoat, useSheen, useIridescence );
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this.useSSS = useSSS;
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}
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direct( { lightDirection, lightColor, reflectedLight }, stack, builder ) {
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if ( this.useSSS === true ) {
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const material = builder.material;
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const { thicknessColorNode, thicknessDistortionNode, thicknessAmbientNode, thicknessAttenuationNode, thicknessPowerNode, thicknessScaleNode } = material;
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const scatteringHalf = lightDirection.add( transformedNormalView.mul( thicknessDistortionNode ) ).normalize();
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const scatteringDot = float( positionViewDirection.dot( scatteringHalf.negate() ).saturate().pow( thicknessPowerNode ).mul( thicknessScaleNode ) );
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const scatteringIllu = vec3( scatteringDot.add( thicknessAmbientNode ).mul( thicknessColorNode ) );
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reflectedLight.directDiffuse.addAssign( scatteringIllu.mul( thicknessAttenuationNode.mul( lightColor ) ) );
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}
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super.direct( { lightDirection, lightColor, reflectedLight }, stack, builder );
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}
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}
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class MeshSSSNodeMaterial extends MeshPhysicalNodeMaterial {
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constructor( parameters ) {
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super( parameters );
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this.thicknessColorNode = null;
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this.thicknessDistortionNode = float( 0.1 );
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this.thicknessAmbientNode = float( 0.0 );
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this.thicknessAttenuationNode = float( .1 );
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this.thicknessPowerNode = float( 2.0 );
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this.thicknessScaleNode = float( 10.0 );
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}
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get useSSS() {
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return this.thicknessColorNode !== null;
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}
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setupLightingModel( /*builder*/ ) {
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return new SSSLightingModel( this.useClearcoat, this.useSheen, this.useIridescence, this.useSSS );
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}
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copy( source ) {
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this.thicknessColorNode = source.thicknessColorNode;
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this.thicknessDistortionNode = source.thicknessDistortionNode;
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this.thicknessAmbientNode = source.thicknessAmbientNode;
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this.thicknessAttenuationNode = source.thicknessAttenuationNode;
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this.thicknessPowerNode = source.thicknessPowerNode;
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this.thicknessScaleNode = source.thicknessScaleNode;
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return super.copy( source );
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}
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}
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export default MeshSSSNodeMaterial;
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addNodeMaterial( 'MeshSSSNodeMaterial', MeshSSSNodeMaterial );
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