[Bf-blender-cvs] [144f41b] soc-2016-cycles_denoising: Cycles: Fix potential divide by zero in the area light sampling code

[Lukas Stockner]

Commit: 144f41ba4e7b548ae9e344ff4a02523b5dd47148
Author: Lukas Stockner
Date:   Thu Aug 4 17:56:17 2016 +0200
Branches: soc-2016-cycles_denoising
https://developer.blender.org/rB144f41ba4e7b548ae9e344ff4a02523b5dd47148

Cycles: Fix potential divide by zero in the area light sampling code

===================================================================

M       intern/cycles/kernel/kernel_light.h

===================================================================

diff --git a/intern/cycles/kernel/kernel_light.h 
b/intern/cycles/kernel/kernel_light.h
index 93c4bd3..bb6c44a 100644
--- a/intern/cycles/kernel/kernel_light.h
+++ b/intern/cycles/kernel/kernel_light.h
@@ -102,7 +102,7 @@ ccl_device float area_light_sample(float3 P,
                float cu = 1.0f / sqrtf(fu * fu + b0sq) * (fu > 0.0f ? 1.0f : 
-1.0f);
                cu = clamp(cu, -1.0f, 1.0f);
                /* Compute xu. */
-               float xu = -(cu * z0) / sqrtf(1.0f - cu * cu);
+               float xu = -(cu * z0) / max(sqrtf(1.0f - cu * cu), 1e-7f);
                xu = clamp(xu, x0, x1);
                /* Compute yv. */
                float z0sq = z0 * z0;

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