Motion vector format info is located here:
http://www.revisionfx.com/support/faqs/motion_vector_FAQs/motion_vector_mat...
You first need to render out your motion vectors from the 3D program you are using. Info you need is here:
http://www.revisionfx.com/support/faqs/motion_vector_FAQs/motion_vectors/ Click on the blue bar for the application you are using. The various tutorials talk about ReelSmart Motion Blur, but the same information is to be used for Twixtor.
Then, with the displacement setting you use, assign Twixtor's motion vectors to that sequence. Depending on the application, you might need to flip the Y component by setting the Vec Scale Y value to -1. Then you'll need to set these vectors to the InputPrevVectors or InputNextVectors as appropriate (that is, whether the motion calculated to the prev frame or next frame by the 3D system).
note that you'll want to perform the retiming on each object individually, because as objects cross the motion vectors will cut the motion distinctly along the objects' silhouettes if you do this will all objects in the scene at the same time (your mileage may vary: retiming all objects at once can also look good depending on the scene composition).
Pete Litwinowicz
RE:Vision Effects, Inc.
