@openhps/core/src/three/nodes/functions/BSDF/F_Schlick.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");
const F_Schlick = /*@__PURE__*/(0, _TSLBase.Fn)(({
  f0,
  f90,
  dotVH
}) => {
  // Original approximation by Christophe Schlick '94
  // float fresnel = pow( 1.0 - dotVH, 5.0 );

  // Optimized variant (presented by Epic at SIGGRAPH '13)
  // https://cdn2.unrealengine.com/Resources/files/2013SiggraphPresentationsNotes-26915738.pdf
  const fresnel = dotVH.mul(-5.55473).sub(6.98316).mul(dotVH).exp2();
  return f0.mul(fresnel.oneMinus()).add(f90.mul(fresnel));
}); // validated
var _default = exports.default = F_Schlick;