The point halfway up the axis; half the height lies above it along Z and half below
Full length along Z, in model units
The X and Y radii of the bottom end, in model units, as [x, y]
The X and Y radii of the top end, in model units, as [x, y]; [0, 0] closes it to a point
Number of flat sides around the cylinder; more makes it rounder
Feeds
shapes.cylinderElliptic: a cylinder standing along Z with an elliptical cross-section that can differ between its two ends, so it also makes cones and tapers.