Commit: a201b99c5aaa7945bd0702c42987a60e3d70ee46
Author: Sergey Sharybin
Date: Mon Mar 20 14:48:37 2017 +0100
Branches: master
https://developer.blender.org/rBa201b99c5aaa7945bd0702c42987a60e3d70ee46
Fix T50975: Cycles: Light sampling threshold inadvertently clamps negative lamps
===================================================================
M intern/cycles/kernel/kernel_emission.h
===================================================================
diff --git a/intern/cycles/kernel/kernel_emission.h
b/intern/cycles/kernel/kernel_emission.h
index bc2d960412..cf14a159e4 100644
--- a/intern/cycles/kernel/kernel_emission.h
+++ b/intern/cycles/kernel/kernel_emission.h
@@ -157,7 +157,7 @@ ccl_device_noinline bool direct_emission(KernelGlobals *kg,
return false;
if(kernel_data.integrator.light_inv_rr_threshold > 0.0f) {
- float probability = max3(bsdf_eval_sum(eval)) *
kernel_data.integrator.light_inv_rr_threshold;
+ float probability = max3(fabs(bsdf_eval_sum(eval))) *
kernel_data.integrator.light_inv_rr_threshold;
if(probability < 1.0f) {
if(rand_terminate >= probability) {
return false;
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