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Treat specular less than 0.02 as occlusion

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This is a very common hack used in almost all PBR renderers to allow removing specular contribution in dielectric materials
This commit is contained in:
clayjohn 2022-07-28 11:01:46 -07:00
parent 674ccdb244
commit 0c65ed38a6
4 changed files with 11 additions and 5 deletions
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7
drivers/gles3/shaders/scene.glsl
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@ -686,7 +686,10 @@ void light_compute(vec3 N, vec3 L, vec3 V, float A, vec3 light_color, float atte
#endif // LIGHT_ANISOTROPY_USED
// F
float cLdotH5 = SchlickFresnel(cLdotH);
vec3 F = mix(vec3(cLdotH5), vec3(1.0), f0);
// Calculate Fresnel using cheap approximate specular occlusion term from Filament:
// https://google.github.io/filament/Filament.html#lighting/occlusion/specularocclusion
float f90 = clamp(50.0 * f0.g, 0.0, 1.0);
vec3 F = f0 + (f90 - f0) * cLdotH5;
vec3 specular_brdf_NL = cNdotL * D * F * G;
@ -1107,7 +1110,7 @@ void main() {
float a004 = min(r.x * r.x, exp2(-9.28 * ndotv)) * r.x + r.y;
vec2 env = vec2(-1.04, 1.04) * a004 + r.zw;
specular_light *= env.x * f0 + env.y;
specular_light *= env.x * f0 + env.y * clamp(50.0 * f0.g, 0.0, 1.0);
#endif
}