A flat plane in space, with an origin, a normal and axes of its own. Where a Solid is taken, a Plane counts as the half-space behind it.
A Plane also fits an input that takes a Frame, a Solid or a Number.
The half-space on the side opposite the normal, as a Solid.
The plane's coordinate frame: an origin plus orthonormal X, Y and Z axes.
The point on the plane closest to the world origin.
The plane's unit normal.
Signed distance to the plane, dot(p, normal) − offset; use it to drive a Range Map or to clip.
The affine map from the plane's local frame to world coordinates.
The opposite half-space: this plane with its normal flipped.
Items that are each a Plane. One Plane wired where a list is taken counts as a list of one. A list wired where one Plane is taken runs the block once per item.