There are many ways to use this tool, depending on if you use it with a polyhedral or nurbs object, or on a group. Grouped objects: the circle represents the surface you are distorting. You can increase or decrease it by pressing the + and - keys.
Polyhedral object: the + and - keys increase or decrease the number of faces under control.
The MetaNurbs tool works on a control box around the object. This tool works only with polyhedral objects, but you manipulate it like nurbs. This is very powerful!
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