[pstricks] Solid mathematical surfaces with pst-3dplot

[Paul Smith]

Dear All

Sometime ago, I asked here whether it was possible with PSTricks to
draw a graph like the one attached. At that time, pst-3dplot could
approximately do that. I say 'approximately' as it could not draw the
surface without any grid. I am now asking whether pst-3dplot has
meanwhile got the ability to draw solid (without any grid)
mathematical surfaces.

Thanks in advance,

Paul
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