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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;
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