[R] What does persp() return?

Paul Murrell p.murrell at auckland.ac.nz
Thu Aug 1 22:36:47 CEST 2002


David Brahm wrote:
> I want to plot some 3D points on top of the grid produced by persp().
> On 2/22/01, Paul Murrell <paul at stat.auckland.ac.nz> wrote in R-help:
> > In S-Plus, persp() returns a value that can be used to transform 3D
> > locations to 2D, but this sort of thing is not (yet) available in R.

Sorry, that is out of date.

> But persp() does return something (in R-1.5.1): a 4x4 matrix which in the C
> code is called the "viewing transformation matrix", VT.  Can VT be used to plot
> additional points?  If not, is such a thing in the works?

Yes.  Try searching Chen Huashan's R-help archives
(http://www.baidao.net/r/archives/forum_show.cgi) for the subject
"persp(): add second plane"

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