# OpenGL Coodinates ## Synopsis OpenGL uses a coordinate system that can be customized, but by default: 1. The origin (0,0,0) is at the center of the viewport. 2. The x-axis goes from left (-1) to right (+1). 3. The y-axis goes from bottom (-1) to top (+1). 4. The z-axis goes from near (-1) to far (+1), with negative z going into the screen. 5. This creates a cube-shaped "clip space" from (-1,-1,-1) to (1,1,1).