Can Rhino draw an oblique cone?
Thanks
How about using _Loft between circle and a point ? (Point option in Loft)
-j
Another option would be to use _RailRevolve: Draw the base circle, position the point where you want the vertex to be, use rail revolve with ScaleHeight=YES. This will produce a surface and you can then use _Cap (Cap Planar Holes) to close the solid.