openscad/openscad — pull request #97 by brianolson (2012-03-03 22:27:34+00:00)
Title: add cylinder() optional args ir= ir1= ir2= which specify an inner-radius

add cylinder() optional args ir= ir1= ir2= which specify an inner-radius
which the facets of the cylinder will be tangent to (alternative to the
usual vertex-radius which causes a polygon inscribed within some radius).