Fix T50698: Cycles baking artifacts with transparent surfaces.

2 files changed, 14 insertions, 1 deletions

diff --git a/intern/cycles/kernel/kernel_bake.h b/intern/cycles/kernel/kernel_bake.h
index 5bcc57cdcdf..f18d145f7cf 100644
--- a/intern/cycles/kernel/kernel_bake.h
+++ b/intern/cycles/kernel/kernel_bake.h
@@ -54,7 +54,8 @@ ccl_device_inline void compute_light_pass(KernelGlobals *kg,
 	float rbsdf = path_state_rng_1D(kg, &rng, &state, PRNG_BSDF);
 	shader_eval_surface(kg, sd, &rng, &state, rbsdf, state.flag, SHADER_CONTEXT_MAIN);
 
-	/* TODO, disable the closures we won't need */
+	/* TODO, disable more closures we don't need besides transparent */
+	shader_bsdf_disable_transparency(kg, sd);
 
 #ifdef __BRANCHED_PATH__
 	if(!kernel_data.integrator.branched) {
diff --git a/intern/cycles/kernel/kernel_shader.h b/intern/cycles/kernel/kernel_shader.h
index d0826e5e879..59c1331a63c 100644
--- a/intern/cycles/kernel/kernel_shader.h
+++ b/intern/cycles/kernel/kernel_shader.h
@@ -685,6 +685,18 @@ ccl_device float3 shader_bsdf_transparency(KernelGlobals *kg, ShaderData *sd)
 	return eval;
 }
 
+ccl_device void shader_bsdf_disable_transparency(KernelGlobals *kg, ShaderData *sd)
+{
+	for(int i = 0; i < ccl_fetch(sd, num_closure); i++) {
+		ShaderClosure *sc = ccl_fetch_array(sd, closure, i);
+
+		if(sc->type == CLOSURE_BSDF_TRANSPARENT_ID) {
+			sc->sample_weight = 0.0f;
+			sc->weight = make_float3(0.0f, 0.0f, 0.0f);
+		}
+	}
+}
+
 ccl_device float3 shader_bsdf_alpha(KernelGlobals *kg, ShaderData *sd)
 {
 	float3 alpha = make_float3(1.0f, 1.0f, 1.0f) - shader_bsdf_transparency(kg, sd);