For 2D and 3D Best Fit alignments, you can specify a center of rotation in one of two ways:
Method 1: Select a feature from the Alignment features list in the Best Fit Alignment dialog box (Insert | Alignment | New | Best Fit button). Next, click the Set button. The theoretical and measured values are automatically entered into the appropriate boxes in the Rotate About area.
Method 2: If a specific coordinate is desired, manually provide the values by typing the XYZ coordinate into the Theoretical and Measured boxes in the Best Fit Alignment dialog box. The number values must be in an X,Y,Z comma-delimited format in order to be valid. The values must be entered in terms of part coordinates with regards to the active alignment trihedron.
If you do not specify a center of rotation, PC-DMIS uses the part coordinate system origin (0,0,0) as the rotation center.
For user-defined Best Fit alignments, you cannot specify the rotation center. In this case, the part coordinate system origin (0,0,0) is always used for degree-of-freedom combinations where a rotation center is relevant.