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Scripting Guide > Three-Dimensional Scenes > Add Lighting, Materials, and Normal Vectors > Specify Lighting Models
Publication date: 05/05/2023

Specify Lighting Models

Lighting models are specified with the Light Model function.

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.

Table 13.4 shows the three valid arguments for the Light Model function.

Table 13.4 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
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