hi there,
i'm stuck with a problem that really drives me nuts: i have a fairly complex 3d scene. my aim is to take a snapshot of a part of this scene via pix_snap2tex, render this texture on a rectangle that covers exactly the same area where the snapshot has been taken and do this over and over again to create trails of objects moving over this part of the scene. now, no matter what i do, the positions of the moving objects and their representations in the snapshots are always slightly off. as a result, the trails are not what they are supposed to be - they tend to vanish in the middle of the snapshot, instead of representing the motion of the moving objects. everything is perfectly fine when doing the same thing with just a single [rectangle 5.33333 4] filling the whole screen, so it works in principle. but i do need to have other parts of the scene visible as well ...
i guess that OpenGL's perspective calculations are kicking in here - is there any way of preventing this? i extensively played around to get this straight: among other things, i tried [ortho], another attempt was to make the single rectangle partly transparent with [alpha], but none of these ideas worked.
i greatly appreciate any help -
thank you, thoralf.
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