I'm not too sure if this is possible with Projector, or it's a 'write only' Effect.
Is it possible to look at what Projector projects onto a polygon as a flat texture, so I can save it as an image? I'd then want to be able to reapply it as a normal polygon instead of the original plane that it was projected on.
So, as in Simon's example here, I'd want to be able to save the plane with the grass projection on, extend the grass to fill the whole plane by cloning it in 2D outside Hitfilm, then putting that plane back in the scene and turning off Projector, to allow for more sideways movement without running out of grass.
That's not actually what I want to use it for, but it's the simplest explanation I can think of for what I want to be able to do.