From a201b99c5aaa7945bd0702c42987a60e3d70ee46 Mon Sep 17 00:00:00 2001 From: Sergey Sharybin Date: Mon, 20 Mar 2017 14:48:37 +0100 Subject: [PATCH] Fix T50975: Cycles: Light sampling threshold inadvertently clamps negative lamps --- intern/cycles/kernel/kernel_emission.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/intern/cycles/kernel/kernel_emission.h b/intern/cycles/kernel/kernel_emission.h index bc2d9604122..cf14a159e47 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;