An infinite plane: an origin point, a normal vector, and a direction vector that fixes the
plane's rotation about its own normal. That third field is what lets an operation place 2D
geometry on the plane with a predictable orientation rather than an arbitrary one.
An infinite plane: an origin point, a normal vector, and a direction vector that fixes the plane's rotation about its own normal. That third field is what lets an operation place 2D geometry on the plane with a predictable orientation rather than an arbitrary one.