topic Revit CAD Link eccentric loft display issue in Revit Architecture Forum

Revit CAD Link eccentric loft display issue

CADuser47 — Tue, 06 Apr 2021 23:33:27 GMT

Having an issue with AutoCAD lofted eccentric circles not display properly when linked into Revit. Lofted concentric circles display fine but any deviation away from an aligned axis and Revit has an issue displaying them. Is this a common issue? Running "Revit 2021" and "AutoCAD 2021".

AutoCAD lofted solids:

CAD linked into Revit:

This issue seems to resolve if you set AutoCAD "LOFTNORMALS" to 2 or above but i require a smooth fit (1).

Re: Revit CAD Link eccentric loft display issue

lucdoucet_msdl — Wed, 07 Apr 2021 02:19:16 GMT

@CADuser47

Try lofting a 2 point polyline rather than a circle for the base and top. I think revit has a hard time lining up the where a "circle" starts and stops.

In autocad, trim your circle in half then create a polyline from the resulting arc and close it. This will create a circular path through two points. Repeat for the top path.

This will create seams in the resulting import but smooth solids and surfaces.

-luc

Circle paths on the left and closed circular polylines on the right.

Re: Revit CAD Link eccentric loft display issue

CADuser47 — Wed, 07 Apr 2021 04:19:54 GMT

Thanks @lucdoucet_msdl for confirming the issue and offering a work around.