Duplicate Volume references become null

[joebain]

Ok, I think I've managed to solve this. It wasn't the duplication that was the cause, but actually a similar problem to a previous thread I posted. I was waiting one frame to allow Curvy to populate its internal refs and get initialized which had worked, but now I have more volumes in my scene it seems to be taking longer. I'm checking now during update and retrying until I get the volumes, and it seems to take 3-4 frames to get all 6 that I need.