Fix PDF calculation

yozhijk · yozhijk · commit e664537e4c20 · 2016-11-25T12:26:55.000+01:00
diff --git a/App/CL/integrator_pt.cl b/App/CL/integrator_pt.cl
@@ -397,7 +397,7 @@ __kernel void ShadeSurface(
                     float2 extra = Ray_GetExtra(&rays[hitidx]);
                     float ld = isect.uvwt.w;
                     float denom = extra.y * diffgeo.area;
-                    float bxdflightpdf = denom > 0.f ? (ld * ld / denom) : 0.f;
+                    float bxdflightpdf = denom > 0.f ? (ld * ld / denom / numemissives) : 0.f;
                     weight = BalanceHeuristic(1, extra.x, 1, bxdflightpdf);
                 }
                 

Original file line number	Diff line number	Diff line change
`@@ -397,7 +397,7 @@ __kernel void ShadeSurface(`
`397`	`397`	`float2 extra = Ray_GetExtra(&rays[hitidx]);`
`398`	`398`	`float ld = isect.uvwt.w;`
`399`	`399`	`float denom = extra.y * diffgeo.area;`
`400`		`- float bxdflightpdf = denom > 0.f ? (ld * ld / denom) : 0.f;`
	`400`	`+ float bxdflightpdf = denom > 0.f ? (ld * ld / denom / numemissives) : 0.f;`
`401`	`401`	`weight = BalanceHeuristic(1, extra.x, 1, bxdflightpdf);`
`402`	`402`	`}`
`403`	`403`