I am a bit confused? if I have a principle shader and a variable I want to output to an extra image plane….
How do I mix them?

Basically how to I say to mantra to check for this variable aswell?

The second image is what i do ussually in a material builder node… but I was wondering if it is possible to do it outside the material builder?

really no way to achieve this? outside the material builder?

Ive been trying to figure out at way to make this work but it seems you have to export your custom attribute from within the shader/material builder. I might be wrong though.

-b