Need to cast light through an object using an alpha? Try using Nuke's Transmission node.
Nuke's Transmission node is one of the nodes that not a lot of users know about, if they do know about it, they may not know how it works.
This video quickly goes through the use and setup of Nuke's Transmission node.
Here is a link to a sample script for this video:
https://drive.google.com/file/d/1yRdeXZqC3tD57FoD2wtdrgW4oGPnpOJa/view?usp=sharing
