Thanks for the answers Matt. But there are still some things unclear.
1) If I draw a closed B-Spline and add a point, the shape of the spline changes (Somehow the point next to the added one are redestributed). I have checked i a few moments ago.
2) I managed to find some tutorials at commotionpro.com due to some extensive google search. I have found these:
http://commotionpro.com/commotion_trial.html
There seems to be no direct link to them. I tried out the rotoscoping tutorial this afternoon and after animating a spline around the hat of the girl for about 10 frames I rendered it to a new clip and applied this new clip to the rotoscoped layer as a track matte. Although the splines masked out the hat and the head very good, the rendered mask/track matte does'nt fit. In some frames (these frames have keyframes for the rotospline) the Track-Matte just lies 2-3 Pixels next to my rotoscoped area. In the Frame before or the next frame the Track Matte/ Mask fits perfect. How can this happen?
3) How do you render your rotosplines? To a new clip, to the alpha or to disk. Since you mentioned that you feather your mask in AE with the Composit Wizard Matte Feather PlugIn and since that PlugIn only works with Alphas I assume, that you render the Splines to the alpha of that clip?
Thanks
Mirko Echghi
