diff options
author | Brecht Van Lommel <brechtvanlommel@gmail.com> | 2014-02-07 18:08:50 +0400 |
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committer | Brecht Van Lommel <brechtvanlommel@gmail.com> | 2014-02-07 18:09:34 +0400 |
commit | 9c83ed774bbc7b74242df0628f1de07df8f04df7 (patch) | |
tree | f78b5a057fe169d6fa70aa400cb3885091ccf451 /intern/cycles/kernel/kernel_light.h | |
parent | 52bae9691b08d24c63e5fa43af644bc5654afb11 (diff) |
Fix T36979: wrong render of textured mesh lights with multiple importance sampling.
Diffstat (limited to 'intern/cycles/kernel/kernel_light.h')
-rw-r--r-- | intern/cycles/kernel/kernel_light.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/intern/cycles/kernel/kernel_light.h b/intern/cycles/kernel/kernel_light.h index 9915cd2495f..c32f0395744 100644 --- a/intern/cycles/kernel/kernel_light.h +++ b/intern/cycles/kernel/kernel_light.h @@ -23,6 +23,7 @@ typedef struct LightSample { float3 Ng; /* normal on light */ float3 D; /* direction from shading point to light */ float t; /* distance to light (FLT_MAX for distant light) */ + float u, v; /* parametric coordinate on primitive */ float pdf; /* light sampling probability density function */ float eval_fac; /* intensity multiplier */ int object; /* object id for triangle/curve lights */ @@ -219,6 +220,8 @@ ccl_device void lamp_light_sample(KernelGlobals *kg, int lamp, ls->object = ~0; ls->prim = ~0; ls->lamp = lamp; + ls->u = randu; + ls->v = randv; if(type == LIGHT_DISTANT) { /* distant light */ @@ -309,6 +312,9 @@ ccl_device bool lamp_light_eval(KernelGlobals *kg, int lamp, float3 P, float3 D, ls->object = ~0; ls->prim = ~0; ls->lamp = lamp; + /* todo: missing texture coordinates */ + ls->u = 0.0f; + ls->v = 0.0f; if(!(ls->shader & SHADER_USE_MIS)) return false; @@ -443,14 +449,24 @@ ccl_device void object_transform_light_sample(KernelGlobals *kg, LightSample *ls ccl_device void triangle_light_sample(KernelGlobals *kg, int prim, int object, float randu, float randv, float time, LightSample *ls) { + float u, v; + + /* compute random point in triangle */ + randu = sqrtf(randu); + + u = 1.0f - randu; + v = randv*randu; + /* triangle, so get position, normal, shader */ - ls->P = triangle_sample_MT(kg, prim, randu, randv); + ls->P = triangle_point_MT(kg, prim, u, v); ls->Ng = triangle_normal_MT(kg, prim, &ls->shader); ls->object = object; ls->prim = prim; ls->lamp = ~0; ls->shader |= SHADER_USE_MIS; ls->t = 0.0f; + ls->u = u; + ls->v = v; ls->type = LIGHT_TRIANGLE; ls->eval_fac = 1.0f; @@ -504,6 +520,8 @@ ccl_device void curve_segment_light_sample(KernelGlobals *kg, int prim, int obje ls->prim = prim; ls->lamp = ~0; ls->t = 0.0f; + ls->u = randu; + ls->v = randv; ls->type = LIGHT_STRAND; ls->eval_fac = 1.0f; ls->shader = __float_as_int(v00.z) | SHADER_USE_MIS; |