Patrick Traile

tamte
here is an example
1. added transmission_bg_mask AOV using LPE: CT.*B
2. combined it with Alpha in a slapcomp over custom BG

display slapcomp in the viewport to see the result

Thanks so much for this @tamte!!!

tamte
I assume you should be able to use background B event in LPE
You obviously not get the refraction information but you should get the background contribution for the chosen lightpaths

Hello @tamte, Thanks for this but don't quite understand how to set this up.

I've added two images here, the one with black shows what I get If I just render the object with nothing in the background and the one with the white bg and white showing in transparent areas is me putting a grid object behind it it the render.

But I want to be able to render with nothing behind it and get the transparent areas instead of black to use this image on a website.

I've also added a hip file if you have the time to show how to set this up.

Thanks much!

how to render an object with transmissive materials and get the alpha to respect the transparency in karma XPU?

by default the transmissive areas just renders black!