If you want to do collision detection in something like a game and you don't want to be constantly debugging collision issues, you have to be way way more aware of numerical precision issues than this article is.
For example, even a basic "point in sphere" test can return logically inconsistent results if the point is right on the surface of the sphere and you swap the x and z coordinates.
Ignoring issues like precision can result in players falling through the world or walking through walls.
For example, even a basic "point in sphere" test can return logically inconsistent results if the point is right on the surface of the sphere and you swap the x and z coordinates.
Ignoring issues like precision can result in players falling through the world or walking through walls.