Models and Coordinate Frames

There are six entities you need to consider:

The Cube Model:

Defined on the unit points .

The Cube Model Frame:

For entering the initial coordinates of the Cube Model.

The Cube Model Gnomon:

A graphic representation of the Cube Model Frame.

The World Frame:

A coordinate system for describing the position and orientation of objects in the scene.

The World Frame Gnomon:

A graphic representation of the World Frame.

The Viewing Frame:

A coordinate system for representing a view of the scene relative to the eyepoint and window.