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Cycles :

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* Use is_zero(a) rather than dot(a, a) == 0, saves some calculations.
This commit is contained in:
Thomas Dinges
2013-05-14 18:31:55 +00:00
parent 6fc51bf20e
commit 1f3bf34ccd
3 changed files with 4 additions and 3 deletions
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intern/cycles/kernel/kernel_light.h
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@@ -492,7 +492,7 @@ __device void curve_segment_light_sample(KernelGlobals *kg, int prim, int object
float r2 = P2.w;
float3 tg = (float4_to_float3(P2) - float4_to_float3(P1)) / l;
float3 xc = make_float3(tg.x * tg.z, tg.y * tg.z, -(tg.x * tg.x + tg.y * tg.y));
if (dot(xc, xc) == 0.0f)
if (is_zero(xc))
xc = make_float3(tg.x * tg.y, -(tg.x * tg.x + tg.z * tg.z), tg.z * tg.y);
xc = normalize(xc);
float3 yc = cross(tg, xc);