#### 7.2.143 ui-center-origin

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