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This sctipt fills a void that I've been longing to have filled in Maya, and that's to make a selection of components into a prefect circle.
-What it does: Creates a GUI and tries to make polygonal components circular along X,Y,Z, or Normal Average of the selection Need to select at least 3 verts, 2 edges or 1 face (face selection is for Maya 2015 and newer only)
-Explanation of what the buttons do: [ Average ] = Creates a circle from the selected components oriented to the normal average of the coinciding verts. [ X ] [ Y ] [ Z ] = Creates a circle aligned to the corresponding planar axis.
Simply make a selection of contiguous edges or a group of adjoining faces and run the tool.
-Notes and Known Bugs/ Limitations in functionality: Currently makes the cirle at the bounding box centre of the selection. Only works to create whole complete circles, not arches. (Using this on border edges between mirrored geo is a good example of what won't work)