colour.geometry.MAPPING_PLANE_TO_AXIS

colour.geometry.MAPPING_PLANE_TO_AXIS = CanonicalMapping({'yz': ..., 'zy': ..., 'xz': ..., 'zx': ..., 'xy': ..., 'yx': ...})

Mapping from coordinate planes to their perpendicular axes.

Maps two-letter plane identifiers (e.g., ‘xy’, ‘yz’) to their corresponding perpendicular axis with sign indicating the direction following the right-hand rule convention.