How can I define the rotation center for a grouped object?
When group a series of objects, the program will ask you to define the pivot (rotation center) for the new group. If you choose “Center of all subgroups’ mesh bounding”, the center of the new group bounding box will be set as the rotation center; if you choose “Center of all subgroups’ pivot”, the center of all subgroups’ centers will be set as the rotation center; and if you choose “Keep the same pivot as the parent”, the center of the new group’s parent group will set as the rotation center.
