Why does this loft fail?

øyvind_kaurstad

Can a 3d curve be used as the guide path for a loft? I can't get it to work. In the following model, I created a 3d curve from the intersection of two surfaces created from splines. Then I created two curve point planes at the ends of the curve, and sketched a (identical) profile on each, piercing one vertex to the intended guide curve (I also tried coincident constraint, but the result is the same). I also added vertices to match.

https://cad.onshape.com/documents/396c89a0c682d3c108fec0cd/w/d48a59923f2f1ddb56381661

Why doesn't this work? Onshape insists that this loft would create a self-intersecting body, but I don't understand why. My ultimate goal is to have more profiles along the guide curve to control twisting of the profile, but I thought I'd start with the simplest possible model, but quite clearly either I'm missing something, or this is currently not possible in Onshape.

michał_1

It insists because it would create a self-intersecting body. In your example guide would be applied only to a single edge, others would stay as a straight lines... you would need 4 guides to complete the task.
Look:

øyvind_kaurstad

I added a new part studio (copy of the first), and added a third profle along the curve, but the loft fails with the same error.

michał_1

It insists because it would create a self-intersecting body. In your example guide would be applied only to a single edge, others would stay as a straight lines... you would need 4 guides to complete the task.
Look:

øyvind_kaurstad

Aha. The guide just can't work as a rail that the complete profile is bound to follow like I thought (like a more controlled sweep). Well, that makes it quite a bit more laborious to achieve what I want. Oh, well. Thanks anyway!