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Dear All, This is my first post to this mailing list (and yes, I did read http://www.r-project.org/posting-guide.html ) so please forgive any faux pas. I'm trying to make a visualization that looks like this http://www.gradient-da.com/img/temperature%20surface%20plot%20470x406.JPG(found through google). The idea is to have a 3D surface plot overlapping a 2d representation of a surface. I can build arbitrary surfaces/polygon shapes (as in http://addictedtor.free.fr/graphiques/graphcode.php?graph=135 ) and I can make the respective 2D plot. What I don'...