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Fix T45447: Area light importance sampling improvement

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Turning on importance sampling on area lights increases noise on diffuse
surfaces. This was caused by PDF calculated for an intersected point on
light instead of original light position.

Patch by Stefan with some own modifications.
This commit is contained in:
Stefan Werner 2015-07-16 08:31:02 +02:00 committed by Sergey Sharybin
parent b00c49838a
commit 51385f6fe8
1 changed files with 3 additions and 3 deletions
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6
intern/cycles/kernel/kernel_light.h
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@ -728,15 +728,15 @@ ccl_device bool lamp_light_eval(KernelGlobals *kg, int lamp, float3 P, float3 D,
if(dot(D, Ng) >= 0.0f)
return false;
ls->P = make_float3(data0.y, data0.z, data0.w);
float3 light_P = make_float3(data0.y, data0.z, data0.w);
if(!ray_quad_intersect(P, D, t,
ls->P, axisu, axisv, &ls->P, &ls->t))
light_P, axisu, axisv, &ls->P, &ls->t))
return false;
ls->D = D;
ls->Ng = Ng;
ls->pdf = area_light_sample(P, &ls->P, axisu, axisv, 0, 0, false);
ls->pdf = area_light_sample(P, &light_P, axisu, axisv, 0, 0, false);
ls->eval_fac = 0.25f*invarea;
}
else