Version 7 SR34
(7.34.23267.11001, 2023-09-24)
Commercial
Example file: LoftBug.3dm (524.0 KB)
I have a loft shifting its seam during a history replay caused by a scale transformation. There are only two input crvs, their seams are not rotating, cp/deg is unchanged, and the directions aren’t flipping during the replay, yet the loft seam is being re-created randomly.
The natural seam on the input crvs:
The seam of the Loft after replay:
The history for this part is complicated, to say the least. One crvs and four 1x1 mm planar srfs control the whole thing.
But the steps to reproduce are simple. The geometry to reproduce this are on these layers:
Move either one of these groups and history replays correctly:
However if you sub-object select the curve and scale it, the Loft seam flips:
The smaller of the bezels uses Loft Natural. The larger uses Loft Automatic. This issue affects both.