I just released a script for 3D Studio Max which lets you straiten edge loops while using geometry constraints. The default loop tools one doesn't work with constraints, and none of the scripts I've seen support all of them either. You can grab it here: https://gumroad.com/products/VCuog/ or watch a video about it here:…
Hi Greg, In the Edit Geometry rollout, further down you'll see; | Make Planar || X | Y | Z |. Certain aspects of what you did in the video can be/are solved by the Z planar handling from that Z button (or X/Y respective to working space type). The Loop Tools ribbon-subpanel works as intended IMO; 'Straightening Curves'…