You can create a sweep solid by a profile face and a path curve.
To open sweep solid:
Click Sweep (Solid toolbar) or click Geometry, Solid, Sweep.
To create a sweep solid, select a face as profile, select a edge or wire as path curve. You can check "End Constraint" to make profile connected with path curve on one vertex. If the path curve is noisy, you can also check "Smooth Path" to make the path smooth.
a.using a triangle face as profile, a bspline curve as path curve, get a sweep solid |