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Ace

What's the difference between a half-space test and a half-plane test? I'm a little confused on how this process works.

meranara

I am also confused about the half-plane and half-space stuff. Could this be re-explained?

Max

The half-space test is just an extension of the half-plane test to 3D.

In 2D ax+by=c defines a line, so taking ax+by<=c gives us half the 2D plane. Similarly, in 3D ax+by+cz=d defines a plane, so taking ax+by+cz<=d gives us half of 3D space.