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Scripting Guide • Three-Dimensional Scenes • Lighting and Normals • Lighting Models
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Lighting Models
Lighting models are specified with the Light Model command.
Light Model( argument, value,...,value )
Light models specify three attributes of lights.
•
The global ambient light intensity
•
Whether the viewpoint is local or is an infinite distance away
•
Whether lighting calculations should be performed differently for the front and back faces of objects.
Light Arguments and Default Values shows the three valid arguments for the Light Model command.
Light Model Arguments and Default Values 
Argument
Default Value
Meaning
LIGHT_MODEL_AMBIENT
(0.2, 0.2, 0.2, 1)
Ambient RGBA intensity of the entire scene
LIGHT_MODEL_LOCAL_VIEWER
0 (false)
how specular reflection angles are computed
LIGHT_MODEL_TWO_SIDE
0 (false)
nonzero values imply two-sided lighting