[pstricks] drawing level curves with pst-3dplot

Herbert Voss LaTeX at zedat.fu-berlin.de
Fri Feb 16 19:23:08 CET 2007

In-Sung Cho schrieb:
> I am looking for a trick to draw level curves on the graph of a
> function and its projection onto the plane, for example, with the
> funciton $z=\sqrt{xy}$ or any other function.
> Specifically, I want to draw the level curve $1=\sqrt{xy}$ on the xy
> plane and the same thing up on the graph itself.
only possible as a colored contour plot:


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