Inputs

An optional mask that specifies areas to exclude from the motion calculation. You can use this input to prevent distortions at occlusions or to calculate motion for a background layer by ignoring all foreground elements.

Note that masks should exist in both views, and O_VectorGenerator treats the alpha values of 1 as foreground and blurs to the 0 value using nearby vectors to recreate object boundaries, rather than image data. When you create a mask using Roto or RotoPaint, you can use the feather control to extend the calculation. For example, the vector map may have a sharper transition at edges with a binary mask, but applying feather on the mask can help smooth the resulting image.