Accueil / npm / three@0.172.0 / src / nodes / functions / BSDF / V_GGX_SmithCorrelated.js
V_GGX_SmithCorrelated.js
import { div } from '../../math/OperatorNode.js';
import { EPSILON } from '../../math/MathNode.js';
import { Fn } from '../../tsl/TSLBase.js';
// Moving Frostbite to Physically Based Rendering 3.0 - page 12, listing 2
// https://seblagarde.files.wordpress.com/2015/07/course_notes_moving_frostbite_to_pbr_v32.pdf
const V_GGX_SmithCorrelated = /*@__PURE__*/ Fn( ( { alpha, dotNL, dotNV } ) => {
const a2 = alpha.pow2();
const gv = dotNL.mul( a2.add( a2.oneMinus().mul( dotNV.pow2() ) ).sqrt() );
const gl = dotNV.mul( a2.add( a2.oneMinus().mul( dotNL.pow2() ) ).sqrt() );
return div( 0.5, gv.add( gl ).max( EPSILON ) );
} ).setLayout( {
name: 'V_GGX_SmithCorrelated',
type: 'float',
inputs: [
{ name: 'alpha', type: 'float' },
{ name: 'dotNL', type: 'float' },
{ name: 'dotNV', type: 'float' }
]
} ); // validated
export default V_GGX_SmithCorrelated;