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From: kevjon
There seems to be a bad bug in using this technique in the latest Nov 12 beta.
When you go to pull points around after extrude->setpath, it adds edges to the surface which crease when points are pulled.
Edit
Did some further testing, it only happens when using polylines. Still works Ok when using curves.
From: Michael Gibson
Hi kev, that's not a bug, it's normal for the surface created in this way to inherit the exact same nature of the curves that are input into it.
If you input a polyline, then the generated surface will behave like a polyline in that direction too, and when you pull around points of a polyline it makes sharp corners, so the surface created in that way will have sharp creases in it in the same way. When a surface is edited in such a way that it develops a sharp crease in it, it gets divided into separate pieces at the crease area, that's where those edges come from.
If you want it to deform smoothly, you'll need to give it input curves that would deform smoothly themselves, that's why the original instructions mentions using Draw curve / Control points specifically.
- Michael
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