okay just a quick question, lets say i have an actor that needs to jump off of something and hit the ground, i have a mat on the ground for the fall, but how do you get the mat out of the shot and make it look like he hit the ground in the same shot? I've seen this in so many behind the scenes videos but never know how they get the mat out of the shot. I was thinking taking a clean plate and masking but that wouldn't work for a shot with movement, so how would you go about this? Thanks for any help!