Tracking Sky in Shake

[yarko]

Hi all, i am new on here and dont have really experience in fx.
im postproducer and motion graphics working on a tv producer in spain.

i have 1 question about how to make a good tracking of a sky in shake.

I have a shot with a blue chroma and 1 sky so…if i track the sky with the shot in first plane i will have the same movement in the sky and its not real…if i move a real camera the sky have less movement than the first plane so…with a blue chroma in background how can i make the track with this lost movement of the sky ???….

i use shake.

i hope u will understand the question, my english is not so good.

Thanks !!!!

[guillem ramisa]

If you track something inte the foreground it will have more movement than the background, this is how perspective works. So when you choose your tracking points you need to find something as close as possible to the thing you want to matchmove. Sometimes you can’t find a good track close enough and that is maybe your problem. You could try a little cheat to get around this and that is to scale down the tracked movement (you will have to edit the animation channel to do this) now the matchmoved plane will appear to have the correct movement. If this doesn’t work you can also use specialized software like boujou, pftrack or something similar to 3d track the shot but that is a whole other story. Good luck.

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