Spot Light

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Spot Light

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A Spotlight emits a cone of light of a certain color. The cone starts at a given position and the direction is given by the orientation. Only objects within the cone are illuminated.

Color

Ambient color: This is the main color of point light. For a spot light this option is turned off.
Diffuse color: This is color of point light when it shines on matt surfaces.
Specular color: This is color of point light when it is reflected in shiny surfaces.

Direction

You can select the shape of the light bundle.

Parallel: Select this option to make the light a parallel bundle (e.g. the sun light). For a spot light this option is turned off.
Spot Exponent [Wide-Narrow]: Select this option to make the light intensity equal in all directions (Wide) or more intensive in the center beam of the spot light (Narrow)
Spot Angle [0..90]: Select the angle of the cone from 0 degrees (very thin bundle) to 90 degrees (light in all directions).

Attenuation

Light attenuation defines how the intensity of the light weakens as it travels away from the source. The attenuation is computed based on the following formula:

Attenuation

where k0 is the constant attenuation, k1 is the linear attenuation, k2 is the quadratic attenuation and d is the distance from the light's position to an object.