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:)

I found a tutorial here on Youtube that shows how to make a painting animation with Dynamic Paint. It works, but I can't figure out why the roller stops rotating after a while. You can download the file here on OneDrive

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You can make the stick movement control the rotation of the roller:

  • Create your object, parent the roller to the stick:

enter image description here

  • Give your roller a Transformation constraint with this kind of setup: Stick as Target, Extrapolation on, Target and Owner > Local Space, Map From > Location with the stick local movement orientation as axis (choose for example -1 and 1 as value, anyway it will be extrapolated), Map To > Rotation with the roller rotation movement axis as destination axis, don't forget to select the target location axis as Source (and choose the rotation value that will match):

enter image description here

Move the stick, the roller should rotate according to the stick speed:

enter image description here

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