Hello all,

Essentially, I'm creating a surface of revolution by revolving a 2d profile
around the profile's vertical axis.  The problem I'm running into is this.
Let's say I define a sample profile as shown below:

   (0.0, 0.5), (0.8, 1), (1, 1), (0.2, 0.5), (0.2, 0.0)

The object should look roughly like a wine glass and when viewed from the
side, it does.  However, when I move the view platform to look at it from
overhead, it looks like the object has a flat and solid top instead of
inside faces.  Loosely speaking, it looks like there is a lid on top of it.

I've tried messing around with the crease angle, lighting, transparency, and
the number of increments around the vertical axis.  Nothing has helped so
far.  Anyone got any other ideas on what could be wrong?  Thanks.

best,
Brian M.

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