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# Inputs

O_VectorGenerator has the following inputs:

Source | A stereo pair of images.
Mask | 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.
The left view. | A mask to select the dancers in the left view.

To see a table listing the nodes or channels each Ocula node requires in its inputs, see Node Dependencies.