R help - Oct 2010 - how to find a function for plotting polygon surfaces: polgon3d(xc, yc, obs)

I have  set of n coordinates xc, yc (but not a grid!) and n observations obs
 at these points.
Where to find a simple plot function (3D perspective) that plots a polygon
(alternative: just segmented points over a map, as eg in library maps).
rgl.surface(xc,yc,obs) is not working.

Thanks
W.Polasek

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