lygia/v1.2.0/lighting/common/gtaoMultiBounce)Returns a color ambient occlusion based on a pre-computed visibility term. The albedo term is meant to be the diffuse color or f0 for the diffuse and specular terms respectively.
Use:
<vec3> gtaoMultiBounce(<float> visibility, <vec3> albedo)
#ifndef FNC_GTAOMULTIBOUNCE
#define FNC_GTAOMULTIBOUNCE
vec3 gtaoMultiBounce(const in float visibility, const in vec3 albedo) {
// Jimenez et al. 2016, "Practical Realtime Strategies for Accurate Indirect Occlusion"
vec3 a = 2.0404 * albedo - 0.3324;
vec3 b = -4.7951 * albedo + 0.6417;
vec3 c = 2.7552 * albedo + 0.6903;
return max(vec3(visibility), ((visibility * a + b) * visibility + c) * visibility);
}
#endif
Use:
<float3> gtaoMultiBounce(<float> visibility, <float3> albedo)
#ifndef FNC_GTAOMULTIBOUNCE
#define FNC_GTAOMULTIBOUNCE
float3 gtaoMultiBounce(float visibility, const float3 albedo) {
// Jimenez et al. 2016, "Practical Realtime Strategies for Accurate Indirect Occlusion"
float3 a = 2.0404 * albedo - 0.3324;
float3 b = -4.7951 * albedo + 0.6417;
float3 c = 2.7552 * albedo + 0.6903;
return max(float3(visibility, visibility, visibility), ((visibility * a + b) * visibility + c) * visibility);
}
#endif
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