I have an overhead shot of a person swimming across a pool. I then have text on top of the water, but it isn't interacting with the shot - until - the swimmer hits the text. Then I want the letters to move away as if the water and swimmer are pushing them away in a random motion. What would be the best way to start? I've experimented with grabbing one of the presets, however the ones that give me the motion I like are very complex and I can't quite figure out how to go from no movement to the random movement.
I see multiple layers of the swimmer footage, used in multiple ways. One would be as a displacement map for the text so it looks like the text is floating on it. Another would be with rotobrush to isolate the swimmer's passing cross the text. Then there may be some animated mesh warp on the text to simulate the swimmer's wake pushing the text around in the water.
You'll probably want to precomp the text to make it easier to do all this.
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA