This is an easy to use 3D surface plotter. Use the Customizer to change the function plotted and the range.

To use in your own code, call `graphFunction3D(function,minX,minY,maxX,maxY)` where the function is a string such as "exp(-x^2-y^2)" (for more details, see here). By default a surface of smallish thickness is drawn. Here are some options:

• `surfaceThickness=dz`: change the thickness of the surface
• `flatMinimumThickness=dz`: does a flat-bottomed graph; dz specifies the minimum thickness (set to 0 for an automatic smallish thickness)
• `bottomFunction=f`: specifies a function for the bottom of the graph

There are also `makePointList()` and `makeFaceList()` functions that generate the arguments for a `polyhedron()`.

This demonstrates and uses my function parser. The standalone version bundles the parser.

Update: May 17, 2017: Rewrote to generate whole polyhedron at once and to use my own code. :-) Update: May 15, 2023: Rewrote (see graph-new.scad) to use function literals now that they are supported in OpenSCAD (but, alas, they're not supported in the customizer).