I'm using two dome lights in my shot, one is for lighting and another one I'm using as a background for my scene, sky with clouds etc... Figured it was most straight forward to have all around sky.
That one have all contributions off sand render light as geometry on so no lighting contribution no shadows only background image all around the scene.
But I would like to have alpha of taht light to be 0. Which I'm strugling to find.
Any idea if that is possible.. or suggestion for another approach to use and image as background like an hdr but no lighting.. that I can control alpha as well?
Thanks

EDIT: went the old fashion way with sphere as background, polar UV projection and added puzzle mate attribute as custom AOV on it so basically created mask for that alone that will use instead of alpha