Gobo

Gobo filter connected to a spot light. Logo texture is connected to slide_map.


The gobo filter can only be used with spot lights. In theatrical stage lighting, a gobo (or "cookie," slang for Cucoloris) is a thin sheet of metal with holes used to break up the light beam into an irregular, more natural pattern such as tree leaves, etc. In the computer graphics world, gobos are sometimes referred to as "slide projectors" (or sometimes "projector lights," but note that in Arnold the gobo is not a light source itself, but a filter applied to a spot light source). Any texture map or procedural shader can be projected through the light.

 


 

See the Light Filters page for more information on how to create and connect the Gobo filter.

 

The blending equation by which the gobo's slide map is combined with the lights output. 'Blend' creates a default gobo effect. 'Replace' multiplies the slide map over the spot light. 'Add' multiplies the spot light over the gobo. 'Sub' inverts the RGB values of the slide map. 'Mix' averages the results equally between the spotlight and the slide map.

Slide Map

The texture map used to create the gobo effect.


Controls the density of the gobo. Higher values will make the gobo more opaque, thereby letting less light through.

Offset

UV coordinate values used to offset the direction of the slide map.

Scales the size of the texture used for the slide map.

Below is an example of a Gobo connected to a spotlight with a slide map of a caustic pattern. In this case, both the Scale S and T have been set with the same values.

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Wrap S and T

Controls how the 2d texture slide map is wrapped around a surface using its S and T texture coordinates.

Periodic

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Mirror

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File

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Clamp

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Black

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Further examples

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