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Cycles: ambient occlusion now takes per-BSDF normals into account.

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This commit is contained in:
Brecht Van Lommel
2012-11-15 15:37:58 +00:00
parent 1c410ab6e7
commit 613cf7ae37
2 changed files with 34 additions and 21 deletions
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35
intern/cycles/kernel/kernel_path.h
View File

@@ -331,12 +331,15 @@ __device float4 kernel_path_progressive(KernelGlobals *kg, RNG *rng, int sample,
float bsdf_u = path_rng(kg, rng, sample, rng_offset + PRNG_BSDF_U);
float bsdf_v = path_rng(kg, rng, sample, rng_offset + PRNG_BSDF_V);
float ao_factor = kernel_data.background.ao_factor;
float3 ao_N;
float3 ao_bsdf = shader_bsdf_ao(kg, &sd, ao_factor, &ao_N);
float3 ao_D;
float ao_pdf;
sample_cos_hemisphere(sd.N, bsdf_u, bsdf_v, &ao_D, &ao_pdf);
sample_cos_hemisphere(ao_N, bsdf_u, bsdf_v, &ao_D, &ao_pdf);
if(dot(sd.Ng, ao_D) > 0.0f && ao_pdf != 0.0f) {
if(dot(sd.Ng, ao_D) > 0.0f && ao_pdf != 0.0f && average(ao_bsdf) != 0.0f) {
Ray light_ray;
float3 ao_shadow;
@@ -347,11 +350,8 @@ __device float4 kernel_path_progressive(KernelGlobals *kg, RNG *rng, int sample,
light_ray.time = sd.time;
#endif
if(!shadow_blocked(kg, &state, &light_ray, &ao_shadow)) {
float3 ao_bsdf = shader_bsdf_diffuse(kg, &sd)*kernel_data.background.ao_factor;
ao_bsdf += shader_bsdf_ao(kg, &sd);
if(!shadow_blocked(kg, &state, &light_ray, &ao_shadow))
path_radiance_accum_ao(&L, throughput, ao_bsdf, ao_shadow, state.bounce);
}
}
}
#endif
@@ -509,12 +509,15 @@ __device void kernel_path_indirect(KernelGlobals *kg, RNG *rng, int sample, Ray
float bsdf_u = path_rng(kg, rng, sample, rng_offset + PRNG_BSDF_U);
float bsdf_v = path_rng(kg, rng, sample, rng_offset + PRNG_BSDF_V);
float ao_factor = kernel_data.background.ao_factor;
float3 ao_N;
float3 ao_bsdf = shader_bsdf_ao(kg, &sd, ao_factor, &ao_N);
float3 ao_D;
float ao_pdf;
sample_cos_hemisphere(sd.N, bsdf_u, bsdf_v, &ao_D, &ao_pdf);
sample_cos_hemisphere(ao_N, bsdf_u, bsdf_v, &ao_D, &ao_pdf);
if(dot(sd.Ng, ao_D) > 0.0f && ao_pdf != 0.0f) {
if(dot(sd.Ng, ao_D) > 0.0f && ao_pdf != 0.0f && average(ao_bsdf) != 0.0f) {
Ray light_ray;
float3 ao_shadow;
@@ -525,11 +528,8 @@ __device void kernel_path_indirect(KernelGlobals *kg, RNG *rng, int sample, Ray
light_ray.time = sd.time;
#endif
if(!shadow_blocked(kg, &state, &light_ray, &ao_shadow)) {
float3 ao_bsdf = shader_bsdf_diffuse(kg, &sd)*kernel_data.background.ao_factor;
ao_bsdf += shader_bsdf_ao(kg, &sd);
if(!shadow_blocked(kg, &state, &light_ray, &ao_shadow))
path_radiance_accum_ao(L, throughput, ao_bsdf, ao_shadow, state.bounce);
}
}
}
#endif
@@ -712,6 +712,8 @@ __device float4 kernel_path_non_progressive(KernelGlobals *kg, RNG *rng, int sam
int num_samples = kernel_data.integrator.ao_samples;
float num_samples_inv = 1.0f/num_samples;
float ao_factor = kernel_data.background.ao_factor;
float3 ao_N;
float3 ao_bsdf = shader_bsdf_ao(kg, &sd, ao_factor, &ao_N);
for(int j = 0; j < num_samples; j++) {
/* todo: solve correlation */
@@ -721,9 +723,9 @@ __device float4 kernel_path_non_progressive(KernelGlobals *kg, RNG *rng, int sam
float3 ao_D;
float ao_pdf;
sample_cos_hemisphere(sd.N, bsdf_u, bsdf_v, &ao_D, &ao_pdf);
sample_cos_hemisphere(ao_N, bsdf_u, bsdf_v, &ao_D, &ao_pdf);
if(dot(sd.Ng, ao_D) > 0.0f && ao_pdf != 0.0f) {
if(dot(sd.Ng, ao_D) > 0.0f && ao_pdf != 0.0f && average(ao_bsdf) != 0.0f) {
Ray light_ray;
float3 ao_shadow;
@@ -734,11 +736,8 @@ __device float4 kernel_path_non_progressive(KernelGlobals *kg, RNG *rng, int sam
light_ray.time = sd.time;
#endif
if(!shadow_blocked(kg, &state, &light_ray, &ao_shadow)) {
float3 ao_bsdf = shader_bsdf_diffuse(kg, &sd)*ao_factor;
ao_bsdf += shader_bsdf_ao(kg, &sd);
if(!shadow_blocked(kg, &state, &light_ray, &ao_shadow))
path_radiance_accum_ao(&L, throughput*num_samples_inv, ao_bsdf, ao_shadow, state.bounce);
}
}
}
}

20
intern/cycles/kernel/kernel_shader.h
View File

@@ -599,21 +599,35 @@ __device float3 shader_bsdf_transmission(KernelGlobals *kg, ShaderData *sd)
#endif
}
__device float3 shader_bsdf_ao(KernelGlobals *kg, ShaderData *sd)
__device float3 shader_bsdf_ao(KernelGlobals *kg, ShaderData *sd, float ao_factor, float3 *N)
{
#ifdef __MULTI_CLOSURE__
float3 eval = make_float3(0.0f, 0.0f, 0.0f);
*N = make_float3(0.0f, 0.0f, 0.0f);
for(int i = 0; i< sd->num_closure; i++) {
ShaderClosure *sc = &sd->closure[i];
if(CLOSURE_IS_AMBIENT_OCCLUSION(sc->type))
if(CLOSURE_IS_BSDF_DIFFUSE(sc->type)) {
eval += sc->weight*ao_factor;
*N += sc->N*average(sc->weight);
}
if(CLOSURE_IS_AMBIENT_OCCLUSION(sc->type)) {
eval += sc->weight;
*N += sd->N*average(sc->weight);
}
}
*N = normalize(*N);
return eval;
#else
if(CLOSURE_IS_AMBIENT_OCCLUSION(sd->closure.type))
*N = sd->N;
if(CLOSURE_IS_DIFFUSE(sd->closure.type))
return sd->closure.weight*ao_factor;
else if(CLOSURE_IS_AMBIENT_OCCLUSION(sd->closure.type))
return sd->closure.weight;
else
return make_float3(0.0f, 0.0f, 0.0f);