Im testing with Deep shadow maps for hold outs, After editing my ROP interface to include the vm_background and dsm_filename aswell as the vm_backgroundmatte i still cant get my shadow map to be recognized by mantra as a hold out.

If i apply the shadow map as a camera background image it works but these parameters are built into the ROP's and im confused as to why they aren't behaving as i'd expect, especially when it has a click box for “use background image as matte”

are there any obvious steps im missing?

Cheers
-Nick