Is it possible in blender to for example have a large visible block and a small invisible block in front of the large visible block in which the invisible block blocks the camera from seeing the large block so there’s just alpha there?
Here’s a picture of what I mean:
The reason I’d like this is so I can video record for example my desk, make a 3D mesh of the top, make the top invisible, and make flames come off the mesh and the flames are invisible when behind the invisible mesh so I can just render it and put the render on top of the video so the final product will look like my desk is on fire realistically. Cause the flames will look like they’re on the objects on my desk as well as behind and around them.
Can anyone help?