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14.0, 13.2, 13.1, 13.0, 12.2, 12.1, 12.0, 11.3, 11 or later
Linux, Mac, Windows
The gizmo works by using a convolution matrix to essentially do an angle specific edge detect. If wanted a ST-map based distortion can be applied that wraps the rim light more realistically around the plate detail.
It works best when you have a hard roto for the object that you want to apply the rim to and in general works well with clothing or high contrast plates.
Here's a link to the blog post for it where you can find a short overview video:
Some examples of how it can be used (white panel is the alpha out of the RimLight tool):