Light Source Independent Models

Depth Shading

Color or intensity determined solely by "depth" of polygon.

Darker colors or intensities at lower elevations.

Effective in modeling terrain or surface data

Avoids complex calculations of lighting dependent models

Simulates realism

Reduce intensity of pixel as the distance from the observer increases

Simulates reduction in clarity as distances from the observer increases

Image fades in the distance

Often used in medical imaging