[occt.git] / src / Shaders / PBRGeometry.glsl

//! Calculates geometry factor for Cook-Torrance BRDF.
float occPBRGeometry (in float theCosV,
                      in float theCosL,
                      in float theRoughness)
{
  float k = theRoughness + 1.0;
  k *= 0.125 * k;
  float g1 = 1.0;
  g1 /= theCosV * (1.0 - k) + k;
  float g2 = 1.0;
  g2 /= theCosL * (1.0 - k) + k;
  return g1 * g2;
}
Commit	Line	Data
67312b79	1	//! Calculates geometry factor for Cook-Torrance BRDF.
	2	float occPBRGeometry (in float theCosV,
	3	in float theCosL,
	4	in float theRoughness)
	5	{
	6	float k = theRoughness + 1.0;
	7	k = 0.125 k;
	8	float g1 = 1.0;
	9	g1 /= theCosV * (1.0 - k) + k;
	10	float g2 = 1.0;
	11	g2 /= theCosL * (1.0 - k) + k;
	12	return g1 * g2;
	13	}