[Jordan Quackenbush]

Here’s a trick I did. And I registered for this forum solely because of this thread 🙂 I spent probably an hour or two trying to figure this one out, searching CreativeCow and the recesses of Google, when I came up with a workaround myself.

I have a shield that was to have a star loop around it and reveal a part of the shield, as a camera rotated around the whole thing. An issue was that the shield was made in C4D, so I was working with a 2D QT. Behind the star were three instances of CC Particle World, following it. In order for the particles to be masked by the shield, I key’d the birthrate to go to 0 the frame the star went behind the shield, and then key’d back to my chosen birthrate when the star re-emerged. You’ll have to adjust a bit if you have velocity and such so that the particles don’t float “into” the area, but the trick seems to be the best I’ve found.

Cheers,
Jordan