How do I make a shadow catcher?
I want to place some text in a scene, put a light behind it and have it cast a shadow on the ground in a video, where I'll place a plane at the same angle as the ground so it looks correct.
I can do this with a light and casting the shadow onto the plane OK, but I want just the shadow, so it'll look like it's on the video's ground and not the plane itself. Various blend modes for the plane don't work and a Set Matte using the plane as a source seems overkill, so I'm stumped.
Probably something simple I'm missing, anyone care to point out what that is?