I am learning the basics of geometry shaders and I came across references to the "Z plane." It's pretty easy to visualize the X and Y planes, but where does the Z plane reside in Cartesian space? Wikipedia says
it can be thought of as a modified Cartesian plane
So how exactly am I going to visualize it? Looking at google images doesn't help either. I am not a math savvy person so can someone help me understand the Z plane better?