The answer I have seen before on this list (but cannot find at the moment) was a suggestion to solve for one of the variables in terms of the other two and then plot with standard 3d plotting routines. I also seem to remember that some of the examples in an RGL vignette had examples of graphed "implicit functions". I call them parametric fucntions, but that term is used in so many other ways that prevent effective searching.

Searching on "rgl parametric function" produced this possibly relevant hit (among others):
http://finzi.psych.upenn.edu/R/library/misc3d/html/parametric3d.html

--
David Winsemius


On Dec 11, 2008, at 12:57 PM, YIHSU CHEN wrote:

Dear R users --

I think this question was asked before but there was no reply to it.
I would appreciate any suggestion any of you might have.  I am
interested in plotting several "implicit functions" (F(x,y,z)=0) on
the same fig.     Is there anyone who has an example code of how to do
this?

Thank you

Yihsu

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