contour labelling [was "Re: [R] image ()"]

There is Delaunay code in the R package tripack, and, implicitly, in
package akima which may well be helpful: if I understand Bill
correctly he wants to put a plane on each triangle to get a surface (which
is interpolation) and Akima was more sophisticated and used quintics
to achieve a smooth interpolated surface. We may be missing the crux
here: was it to have a means of displaying such surfaces?

Yes, bang on. I knew of the existence of the Delaunay code in the R
libraries. Yes I want to make a picture that places a planar facet on each
triangle. The resulting surface looks like the surface of a cut diamond
for example (assuming the cuts give triangular facets). So far as I know
there is no way to display such a 3D plot in R. persp uses rectangular
rather than triangular mesh.

From the description of the akima package, it sounded like it just did

some of the work required PRIOR to making the 3D plot. But that is useless
if I can't make the plot.

I think of it as the 3D version of the 2D  
connect-the-dots-with-line-segments plot. Now the points are connected by
planes rather than lines.

Bill

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