surf2solid.py

A quick and dirty sketch of a python clone of http://www.thingiverse.com/thing:6955
Takes a function of x,y,r, and t (theta, in radians), plots it, returns it as a solid which it spits to stdout, or writes to a .scad or .stl file, depending on usage. Arguments are set toward the top of the scrip. The function is specified as a string. This script requires numpy. Comments need improvement.
Python seems popular, so I'm hoping this will be stolen and modified.
There are probably still bugs in the mesh generation, I haven't even tried slicing the test object. If you spot a fix, tell me (or post a fix as your own thing).
update : fixed generation of base polygons
update : fixed normal orientation for .scad and .stl output
update : fixed scaling issues, now scales part to the intended dimensions
update : fixed some command line argument parsing
update : OpenSCAD doesn't like the .stl output, but the .scad script output seems ok. Probably some problem with specifying the normals.



Instructions
( for mac / linux, I don't know how python works on Windows )
I call it like so : python surf2solid.py > test.stl
you can now also call it like :python surf2solid.py test.stl
python surf2solid.py test.scad
if you changed permissions to executable ( chmod 777 surf2solid.py ) you can also : ./surf2solid.py output.stl
or if you rename to surf2solid and move it to /usr/bin ( or something else on your path : surf2solid output.stl