Just finished a macro that will generate a knurled cylinder (since you 
can't really knurl anything else, it's a lathe operation...).

Parameters are:
major_radius (radius to the middle of the knurl)
knurl_depth
edge_length (edge being the sides of the square for each point)
cylinder_height
flatten_percent (amount of the point flattened off)

Thanks to clipka for how to CSG with a mesh and have it preserve 
interior, I had never seen inside_vector before.

It was inspired by the impressive looking hockey puck by P Brewer, and 
since he said it was too hard to figure out the mesh, I took it as a 
math challenge. It is mainly a mesh2, fully optimized with no 
overlapping vertexes.
If there is any desire, I will clean it up and post an include file in 
p.b.sf, else I'll just be happy with my own work.

cshake

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