12.5 SHADED POLYGONS

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This method is identical to the previous method, except a polygon will be filled with pixels of varying color, which makes the object appear more real.

A Light Source(s) is defined for a picture. The light has a specific color, direction, distance, etc.

Ambient light (background, non-direct) also plays a part.

The color of a pixel will change with the angle of the polygon to the light, the distance from the light, the color of the light, etc.

Advantages,

- the solid begins to look like cartoons, or paintings

- still simple to understand and implement

Disadvantages,

- can be slow

- requires shaded image display capabilities

Many Shading methods can be used to give different approximations of light,

- Goroud shading

- Phong shading