What are Motion and Disparity planes?

Hey!

What are these?

Backward.Motion
Forward.Motion
DisparityLeft.Disparity
DisparityRight.Disparity

I’ve tried to find some information about all the image planes in Natron, but I couldn’t find anything.
Could you help me out?

Selection_999(532)

AFAIK disparity maps are used for making stereo images
Not quite sure about the other. You can Google it…

I think the motion passes are related to motion vectors.