PTC Geomagic online help document
 

http://www.geomagic.com/en/techpubl...ouse_Action.htm

Best Fit Alignment

Tools > Alignment > Best Fit Alignment (does not apply to point objects) changes the coordinates of one object to match the other using a best-fit algorithm.

This function operates in two phases:

• <LI class=p-Bulleted1 style="MARGIN-LEFT: -20px">the initial gross alignmentphase, in which the objects are aligned only roughly using a lower number of points of comparison. Initial gross align&shy;ment can be bypassed if the user know the objects are already in rough alignment.
  
• the fine adjustmentphase, in which alignment is optimized using a higher number of points of comparison.