(Open) [HOU-3689] Matte shadow discrepancy between CPU and GPU renders

V-Ray V-Ray for Houdini Issues
1

Hello.

I’m having a different behaviour between GPU and CPU when rendering matteshadow objects with shadows in alpha
In CPU renders ok but in GPU is like is including the shadow of the objects and the shading of the matte object.

I include a small scene to illustrate the problem.

CPU.jpg
CPU.jpg2555×1365 343 KB
GPU.jpg
GPU.jpg2559×1368 361 KB

MatteShadow_GPUproblem.zip (59 KB)

2

Hey @gagui ,

It appears the Shadow Bias value of the Rect light is causing this - nudging it slightly up will resolve the problem on my end.
I’ll log it for the developers to take a look.

Best regards!

3

Ok, thanks Gosho!