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Back{ polyhedron( points=[ [ 0,0,h0], [ ord*cos(lf0), ord*sin(lf0), h2], [ ird*cos(lf1), ird*sin(lf1), h2], [ ord*cos(lf2), ord*sin(lf2), h2] echo(" Knurled Surface Library v2 "); echo(" Parameters, all of these lines? (would these 4 lines **ever** connect to the middle // the first // only keep everything starting at the point they're to be severed. [See this image of the GNU Lesser License.