Hey there,

I'm using the Background Plate Node in Solaris with Karma to get AOVs for Shadows and Bounce Light from my render objects.
However I noticed that all the influence from my shadow catcher on the render object disappears as soon as I turn it into a Background Plate.

Imagine a blue rubbertoy in a pink alley. The rubbertoy casts shadows and blue bounce light onto the alley. The alley gives pink bounce light to the rubbertoy. But when I turn the alley into a background plate, the pink bounce light on the rubbertoy disappears.

How can I fix this? I can split it into two streams and work with regular indirect AOVs but ideally I want to render everything at once.

Thanks!

Only way I know how to improve it, is to jump into the shader inside the Background Plate Node and tweak.

You need to be an a fairly new build of 20.5 for this to work because there was a bug that put down the wrong shaders (not MTLX). On 20.5.410 this should work (it did not in 20.5.370).