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public/sdk/three/jsm/nodes/functions/PhongLightingModel.js

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+import LightingModel from '../core/LightingModel.js';
+import F_Schlick from './BSDF/F_Schlick.js';
+import BRDF_Lambert from './BSDF/BRDF_Lambert.js';
+import { diffuseColor } from '../core/PropertyNode.js';
+import { transformedNormalView } from '../accessors/NormalNode.js';
+import { materialSpecularStrength } from '../accessors/MaterialNode.js';
+import { shininess, specularColor } from '../core/PropertyNode.js';
+import { positionViewDirection } from '../accessors/PositionNode.js';
+import { tslFn, float } from '../shadernode/ShaderNode.js';
+
+const G_BlinnPhong_Implicit = () => float( 0.25 );
+
+const D_BlinnPhong = tslFn( ( { dotNH } ) => {
+
+	return shininess.mul( float( 0.5 ) ).add( 1.0 ).mul( float( 1 / Math.PI ) ).mul( dotNH.pow( shininess ) );
+
+} );
+
+const BRDF_BlinnPhong = tslFn( ( { lightDirection } ) => {
+
+	const halfDir = lightDirection.add( positionViewDirection ).normalize();
+
+	const dotNH = transformedNormalView.dot( halfDir ).clamp();
+	const dotVH = positionViewDirection.dot( halfDir ).clamp();
+
+	const F = F_Schlick( { f0: specularColor, f90: 1.0, dotVH } );
+	const G = G_BlinnPhong_Implicit();
+	const D = D_BlinnPhong( { dotNH } );
+
+	return F.mul( G ).mul( D );
+
+} );
+
+class PhongLightingModel extends LightingModel {
+
+	constructor( specular = true ) {
+
+		super();
+
+		this.specular = specular;
+
+	}
+
+	direct( { lightDirection, lightColor, reflectedLight } ) {
+
+		const dotNL = transformedNormalView.dot( lightDirection ).clamp();
+		const irradiance = dotNL.mul( lightColor );
+
+		reflectedLight.directDiffuse.addAssign( irradiance.mul( BRDF_Lambert( { diffuseColor: diffuseColor.rgb } ) ) );
+
+		if ( this.specular === true ) {
+
+			reflectedLight.directSpecular.addAssign( irradiance.mul( BRDF_BlinnPhong( { lightDirection } ) ).mul( materialSpecularStrength ) );
+
+		}
+
+	}
+
+	indirectDiffuse( { irradiance, reflectedLight } ) {
+
+		reflectedLight.indirectDiffuse.addAssign( irradiance.mul( BRDF_Lambert( { diffuseColor } ) ) );
+
+	}
+
+}
+
+export default PhongLightingModel;