hello,

30 minutes ago I started looking at the parametric object, and the result
was a bit strange (and slow). I used the piece of code from the help files
to make a sphere, and then changed it to make a half sphere and gave it a
"pigment{White}". I was expecting to see a white half sphere, but what I
saw, was a blackish/grey-ish kind of shape.
This puzzeled me. So I made added a half white hollow sphere to the scene,
to show you (the newsgroup) wat I was expecting, and what I was getting.
But then it even became more puzzling. There were now 2
half-white-hollow-spheres!

Does anyone know what is happening here?

The source will be posted in p.b.sf

Thanks in advance,

JWV

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