[R] Two surfaces in one plot with visibility

Michael Friendly friendly at yorku.ca
Tue Feb 14 15:19:46 CET 2012

On 2/13/2012 11:15 AM, Duncan Murdoch wrote:
> On 13/02/2012 9:24 AM, Sebastian Schubert wrote:
>> Hi,
>> I would like plot two surfaces which are each given by vectors x and y,
>> and a matrix m(x,y) representing the z coordinate. With persp() I can
>> plot both, using par(new=TRUE) I can put it in one plot. However, I
>> would like to have the visibility of the surfaces taken into account as
>> if they are solid thin surfaces, so that for example the order of the
>> plot commands does not matter.
>> Any idea how to do that?
> That's really hard in persp(). You'd have to plot the facets of the
> surfaces from back to front, and there's no easy way to do that.
> I'd recommend using rgl::persp3d, where your graphics hardware will do
> the computations of which surface is in front.
> Duncan Murdoch

In addition to using rgl, you might find it useful to use transparent 
colors for one or both surfaces.

Michael Friendly     Email: friendly AT yorku DOT ca
Professor, Psychology Dept.
York University      Voice: 416 736-5115 x66249 Fax: 416 736-5814
4700 Keele Street    Web:   http://www.datavis.ca
Toronto, ONT  M3J 1P3 CANADA

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