Sometime during the Rhino 6 development, we added a new method to extrude a curve a distance along an axis with draft angle. This new method, Brep.CreateFromTaperedExtrudeWithRef, produces
better different results than Brep.CreateFromTaperedExtrude method which as been in RhinoCommon for a while.
Anyway, since this flew under the radar, I thought I’d point this out. Here is a Grasshopper deal that shows the differences in output.
test_extrude_curve_tapered.gh (13.6 KB)