OptionalcappedWhether to close both ends with a cap; defaults to true.
OptionaldepthExtent along Z; defaults to 1. The solid spans [-depth/2, depth/2].
The closed outline to extrude, in the XY plane. At least three points, in either winding — the builder normalizes to counter-clockwise. The last point is not repeated: the outline closes from the last back to the first.
Concave outlines are fine, capped or not, as of the §52 tessellation packet (2026-08-09). The outline must be simple — no edge crossing another — while the caps are on; see extrudeGeometry.
Options of extrudeGeometry.