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Weight sample in importance sampling

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This commit is contained in:
Vincent Lejeune 2014-12-07 18:26:51 +01:00
parent 7686628401
commit e491422bdc
1 changed files with 6 additions and 3 deletions
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9
data/shaders/importance_sampling_specular.frag
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@ -16,15 +16,18 @@ void main(void)
vec3 up = (RayDir.y < .99) ? vec3(0., 1., 0.) : vec3(0., 0., 1.); vec3 up = (RayDir.y < .99) ? vec3(0., 1., 0.) : vec3(0., 0., 1.);
vec3 Tangent = normalize(cross(up, RayDir)); vec3 Tangent = normalize(cross(up, RayDir));
vec3 Bitangent = cross(RayDir, Tangent); vec3 Bitangent = cross(RayDir, Tangent);
float weight = 0.;
for (int i = 0; i < 1024; i++) for (int i = 0; i < 1024; i++)
{ {
float Theta = samples[2 * i]; float Theta = samples[2 * i];
float Phi = samples[2 * i + 1]; float Phi = samples[2 * i + 1];
vec3 sampleDir = cos(Theta) * RayDir + sin(Theta) * cos(Phi) * Tangent + sin(Theta) * sin(Phi) * Bitangent; vec3 L = cos(Theta) * RayDir + sin(Theta) * cos(Phi) * Tangent + sin(Theta) * sin(Phi) * Bitangent;
FinalColor += textureLod(tex, sampleDir, 0.); float NdotL = clamp(dot(RayDir, L), 0., 1.);
FinalColor += textureLod(tex, L, 0.) * NdotL;
weight += NdotL;
} }
FragColor = FinalColor / 1024.; FragColor = FinalColor / weight;
} }