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. - 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.
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