@openhps/core/src/three/nodes/functions/BSDF/D_GGX.js

Open Hybrid Positioning System - Core component

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _TSLBase = require("../../tsl/TSLBase.js");
// Microfacet Models for Refraction through Rough Surfaces - equation (33)
// http://graphicrants.blogspot.com/2013/08/specular-brdf-reference.html
// alpha is "roughness squared" in Disney’s reparameterization
const D_GGX = /*@__PURE__*/(0, _TSLBase.Fn)(({
  alpha,
  dotNH
}) => {
  const a2 = alpha.pow2();
  const denom = dotNH.pow2().mul(a2.oneMinus()).oneMinus(); // avoid alpha = 0 with dotNH = 1

  return a2.div(denom.pow2()).mul(1 / Math.PI);
}).setLayout({
  name: 'D_GGX',
  type: 'float',
  inputs: [{
    name: 'alpha',
    type: 'float'
  }, {
    name: 'dotNH',
    type: 'float'
  }]
}); // validated
var _default = exports.default = D_GGX;