OptionalcapRings per hemispherical cap; defaults to 8. A finite integer ≥ 1.
OptionalheightLength of the cylindrical section only, so the total extent along Y is
height + 2 · radius. Defaults to 1.
That is the same measurement @fourjs/physics' capsule collider takes (§24),
which is the whole point: a capsule body and the capsule drawn for it are
built from the same two numbers and cannot disagree.
OptionalradialSegments around the axis; defaults to 32. A finite integer ≥ 3.
OptionalradiusRadius of the cylindrical middle and of both hemispherical caps; 0.5.
Options of capsuleGeometry.