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camera projection- can't explain alpha issue

PostPosted: Thu Mar 01, 2018 9:55 am
by Martin Raw
I'm trying to remove a reflector from the lower right of the sequence. The camera is handheld and moves backwards. I tracked the shot and tracked the area with the riders on again and managed with a little help to get the pointcloud to meshlab and finally get a mesh to project the clean plates onto. Far from perfect, but at least.
I painted two cleanplates one from the first, one from the last image and prepared the projection cams.
I took my camera from the track(now named Rendercam) and copied it two times. I removed the keys so I got a still cam for the first and last frame.

Projection for the end works fine. Skewed in the beginning, but that is expected, right?
Projection for the not. The first frame looks alright, but then a gap appears at the bottom.
I can't figure out where this comes from. When I disconnect the catcher, the geo is there. Why that gap?

any help appreciated. thanks