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...tions regarding the persp function from the graphics package: 1. In the documentation of the persp function, it is said, that the "col" argument will ignore transparent colors. However, this is not true, if you use strings as color code - at least it works with HEX-code (eg. : col="#bf000022" would produce a red-colored surface with transparency = 22). 2. It would be helpful if one could add a surface to an existing plot. I simply copied persp and deleted the "plot.new()" line, but I guess there are better ways... Cheers, Christoph [[alternative HTML version deleted]...