Where am I?

Most people who write 3D programs think in terms of a 3D coordinate system with three axes.

A specific point or location in that coordinate system is specified by three coordinate values.

The axes are typically thought of as:

• A horizontal axis
• A vertical axis
• An axis that is perpendicular to a plane that goes through the horizontal and vertical axes.

Typically those axes are thought of as being represented symbolically by:

• X (horizontal)
• Y (vertical)
• Z (perpendicular to X and Y)