Another useful representation is as a point in spherical coordinates. The polar+azimuth angles encode the normal, and the radius encodes the distance from the origin.
This is handy because it puts similar planes nearby in space. For example, it allows you to efficiently cluster objects by coplanarity using a spatial index.
This is handy because it puts similar planes nearby in space. For example, it allows you to efficiently cluster objects by coplanarity using a spatial index.