Blackmagic Forum

Hello, I have a 3D shape and with the Catcher Node that I captures a specific projection for that Shape. However, I also want to additionally crop this 3D shape with a mask.

That doesn't seem to work, right? I thought, in my youthful naivety, maybe I'd put a Merge Node behind it or a Matte Control and then mask those. But that doesn't work because we're in 3D.

Does anyone have an idea how it could still work?

Depending on your setup, most of the time you need to do your masking before feeding it into the 3D system. So give that a try first. I am still not 100% sure how the Catcher Node works, so I could be wrong.

So, I've tried out several thoughts.

It doesn't work to insert the CatcherNode along with the mask into the Shape3D.

It doesn't work to put the mask and CatcherNode in a line before the Shape3D either.

The only option is to mask the projection itself. The clip feeding the projector is trimmed in such a way that the 3D shape is cropped by the projection. For this, you need to set up a separate projector with its own ID for the shapes in the composition that need to be cropped. This makes the process cumbersome, but theoretically, it's possible.