
I used the Bresenham Circle Algorithm, so it's amazingly fast. The solid dirt cylinder (length 100, radius 5) in the middle took about 2 seconds, while the outer glass hollow cylinder (length 100, radius 10) took less than a second. It's the //hollowcylinder and //cylinder commands, and both are documented in the README.
Additionally, the WorldEdit API has the added worldedit.hollow_cylinder and worldedit.cylinder functions, so anyone can use these routines in their own mods!
Spheres coming soon!

