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Re: 3D plot with range restricted to non-rectangular region
The DrawGraphics package contains commands that allow you to mask parts of a plot, making it look like you have only plotted in the region you choose. There is documentation in the DrawGraphics help that shows how to do this for the 2D and 3D cases. Look here for a complete example where I used that technique to plot the minimum of two linear programming problems (2D contour plots): http://chris.chiasson.name/Engineering_Optimization/ch04.html or http://chris.chiasson.name/Engineering_Optimization/ch04.xhtml The only catch is, the DrawGraphics package is commercial; it's current price is listed on David Park's site: http://home.earthlink.net/~djmp/Mathematica.html Maybe it would be a good idea for Mr. Park to put an html version of the help pages up - you know, to show what can be done?