[Brian Sites]

I haven’t experienced your exact problem, but I have run into strange behavior moving cameras in 3D environments. One trick I found (I think from this forum) was to attach (I think parent?) the camera to a null object and move the null object, not the camera (though the camera follows the null object). For reasons I don’t understand that resolved various strange camera behavior and artifacts between key frames. I’m just a novice, but perhaps this is helpful.

[Brian Sites]

Thanks for your response, and for linking the video tutorial. I remember that I saw them do some other method that involved almost no frame by frame masking (and it was in CS3 or CS4), but maybe I’m just remembering it wrong. I’ll go look a fourth time to try to find the old tutorial that I saw, maybe it’s still on YouTube somewhere and I just didn’t find it the first several times looking. Thanks again for your advice!

[Brian Sites]

Thanks for your reply. I’ll try to explain more clearly what I’m looking for.

Boiled down to its basic details, I’m looking for a way to convert video of things moving around into a sort of black and white video that displays things based on movement. In other words, the black and white video is an interpretation of the original video and looks very little like it – it’s just a visual representation of where there was movement in the original shot. In the tutorial I saw long ago there was a person sitting at a desk facing the camera moving only his hands back and forth. When he did this trick, whatever it is, all you could see was (I think) black lines that would increase or decrease in intensity around the location of the moving hands. There was no longer a person in the background, he was converted to white plain background since he wasn’t moving. Where his hands were you saw instead black shapes resembling hands that increased and decreased in intensity as they moved.

How do you do that? Thanks!