VRay Light Disc Behind Glass Pane Renders as Black Disc

[Joelaff]

The only thing in v-ray that could produce NaNs of this kind would be negative component filters, like Lanczos, in rendering.
It's normally a pixel-sized ring around bright objects, however (it's only the negative component, after all), so the center is highly suspicious to me.
A scene would be great, indeed.

We just got inf pixels caused by gamma on a falloff map in a Fog color slot. Clamping said map with an Output node fixed it. Not sure I have seen any nan recently.

nan pixels bring back nightmares of Mental Ray black squares.

[Joelaff]

Glad you solved it, and it was something simple!

[yavor.rubenov]

I found it what the issue was - somehow - the curves filter in the VFB was smashing out high values to black.

Can you get me a vrimg file and the layer preset that causes issues ?

[JD3D_CGI]

Are you not able to access the Archive bundle I sent through to tech support?

[yavor.rubenov]

I got the scene from the ticket. Here's the curve i see:



If you zoom out you can see that for values bigger than about 34 the curve goes below zero. The values of pixels of the sphere lights are about 1000 -> so the curve converts those values to values below zero.