Right, I hope I explain this well.
For a current project I am trying to use a projector to display my animation on a wall. I've never really tried this before so I'm getting a little confused and hope someone can help. My animation will consist of a number of small digital screens within it, and I want the space around these 'digital screens' to be transparent to the projector. So, essentially, I want to mask around these 'digital screens'.
I hope the image show what I'm trying to achieve a little clearer. The red rectangles are the 'digital screens' that I want projected. The grey around it, I want completely masked out so, when projected, you just see the red rectangles.
Does anyone know if this is achievable? Would I need special software to mask video being outputted by a projector?