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This page provides information on the GI tab of V-Ray's Render Settings.

 


Overview

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Global Illumination (or GI) is the illumination in a scene that effectively comes from reflected (or bounced) light as opposed to coming directly from a light source. This enables more naturalistic and accurate lighting solutions.

The indirect illumination controls in V-Ray are divided into two large sections: primary diffuse bounces and secondary diffuse bounces.

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  • A primary diffuse bounce occurs when a shaded point is directly visible by the camera, or through specular reflective or refractive surfaces.
  • A secondary bounce occurs when a shaded point is used in GI calculations.


UI Path: ||Properties Editor|| > Render > GI tab

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||Properties Editor|| > Render > GI tab

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Rollouts

The GI tab includes the following rollouts:

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Global Illumination

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On – Enables/disables indirect illumination.

Engine – Specifies the method to be used for the secondary diffuse bounces. This option determines the contents of the next rollout. Follow the link for each GI Engine, to see its options.

None – No secondary bounces will be computed. Use this option to produce skylit images without indirect color bleeding.
Brute force – Selects the brute force method (direct computation) for secondary diffuse bounces. See the  Brute Force Engine section for more information.
Light cache – Selects the light cache method as the secondary GI engine. See the Light Cache Engine section for more information.

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Caustics

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Caustics is an effect that is produced when light rays are reflected or refracted by materials, producing visible light patterns. See its options on the Caustics Rollout page.

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  • Global Illumination - Controls GI settings and sets the primary and secondary GI engines. Determines which additional rollout(s) are exposed.
  • Primary engine rollouts - Irradiance map, Brute Force or Light Cache.
    • Secondary engine rollouts - Brute Force or Light Cache.