Does anyone have a a good process as to how to properly render and composite pyroFX elements into live action footage.

1. I have pyroFX footage that I've cached and now ready to render
2. I have collision objects in the footage that I'd like to mask out as they were placeholders and would lke to composite them out, but still make it look like the objects in the live action footage were aflame.
3. I tried placing 3d objects and using a shadow matte (much like the useBackground shader in Maya). I thought this would be the best aproach.
4. Problem: I've tried a few renders hoping that the collision geometry would mask out parts of the pyrofx I don't want visible but it causes luminosity issues during the compositing stage.

Some tips would be greatly appreciated.

try go to collision object render tab and select matte shading on. It might solve ur issue.

It certainly did. Thanks for this. It worked!