I've found a bug in the Round_Cone macros in shapes.inc. I'm not sure if this
counts as a 'proper' POV-ray bug, but I wanted to post an illustration too so
it can go here for now. Should I also post this to povray.bugreports?

Anyway, the problem is that for very shallow-angled cones (i.e.,
baseradius-topradius >> height), there is a small gap running around the larger
end, between the torus and the two bulk cones. It is quite clear in the image
below.

It may have an adverse effect on CSG as a union and on transparent cones as a
merge. The fix is quite simple, and involves simply filling the end torii with
cylinders. Just add this code to the body of the macro:

cylinder { PA, PA + 2*Axis*EdgeRadius, R1 }
cylinder { PB, PB - 2*Axis*EdgeRadius, R2 }

anywhere inside the union/merge and after R1 and R2 are defined.

Hope this helps

Bill

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