Fix T45232: Cycles bake artifacts with transparent textures

The issue was caused by uninitialized ray used for composite and AO evaluation.

Can;t really think of "proper" ray configuration here, it's all a bit arbitrary
but think initializing the ray in a way so we look at the surface in a negative
normal direction is much better alternative to uninitialized ray.

Open for alternative suggestions tho.

1 files changed, 7 insertions, 0 deletions

diff --git a/intern/cycles/kernel/kernel_bake.h b/intern/cycles/kernel/kernel_bake.h
index 2fca83c615f..2b305e5488d 100644
--- a/intern/cycles/kernel/kernel_bake.h
+++ b/intern/cycles/kernel/kernel_bake.h
@@ -31,6 +31,13 @@ ccl_device void compute_light_pass(KernelGlobals *kg, ShaderData *sd, PathRadian
 	float3 throughput = make_float3(1.0f, 1.0f, 1.0f);
 	bool is_sss_sample = is_sss;
 
+	ray.P = sd->P + sd->Ng;
+	ray.D = -sd->Ng;
+	ray.t = FLT_MAX;
+#ifdef __CAMERA_MOTION__
+	ray.time = TIME_INVALID;
+#endif
+
 	/* init radiance */
 	path_radiance_init(&L_sample, kernel_data.film.use_light_pass);