#### 7.2.143 ui-center-origin

`(ui-center-origin [origin|bbox-center])`
  Set the origin of the coordinate system of the `CENTER` object for user interface (i.e. mouse) controlled motions. The keyword `origin` means to use the origin of the coordinate system of the currently selected object, while `bbox-center` means to use the center of the bounding box of the current object. The keyword `bbox-center` makes no sense if the geometry is non-Euclidean. Using either `bbox-center` or `origin` does not make a difference if the center object is not a geometry, e.g. if it is a camera. Same holds if the World is the currently selected object.