Ok, one thing I've been working on for the last day or so is a new "Tangent preserving sweep" mechanism.

This is a special mode for sweep which can kick in if you have all planar profiles, and all profiles share a common tangent direction. In this case the sweep is done in a different way such that the resulting surface maintains the common tangent direction of the profiles.

In a normal sweep the profiles get disturbed due to their rotation as they slide along the rails, if the rails are not symmetrical mirror images of one another.

Here is an image to show the results - these are half surfaces mirrored over with the center edge hidden. The standard sweep is on the left, the new Tangent preserving sweep on the right.



Surface quality seems amazingly good, except for a small subtle bump right near the pole, I'm going to see if I can do something about that.

I was also thinking of calling this a "mouse buttocks removal" sweep... :)

- Michael