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ParamtricPlot3D


when displaying s sphere with

ParametricPlot3D[{Sin[u]*Cos[v],Cos[u]*Cos[v],Sin[v]},{u,-Pi,Pi},{v,-Pi,Pi}]

the resultig display does NOT have a convex surface.

and so does
ParametricPlot3D[{Sin[u]*Sin[v],Cos[u]*Sin[v],Cos[v]},{u,-Pi,Pi},{v,-Pi,Pi}]

in the second case, in the horizontal crosscuts
ther points go "in and out", one is close, ons is farther next is closer
...
to the center.

since i want to create 3d objects in other programs,
this is not good.

setting PlotPoints higher 
does not completely solve the problem.
is there an easy solution?

--
Erich Neuwirth, Computer Supported Didactics Working Group
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