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the V-Ray tab

 when the render engine

is V-Ray GPU. From this rollout you can select the Secondary GI engine.

For additional information on the different GI engines and how they compare with each other, see

the Indirect Illumination

 page.

UI Path

: ||Render Setup window|| >

V-Ray

tab >

Global Illumination

rollout (Renderer set to V-Ray GPU)

 – Specifies the secondary engine. 

None – No secondary bounces are computed. Use this option to produce skylit images without indirect color bleeding.
Brute force – Causes V-Ray to use direct computation for secondary diffuse bounces.
Light cache – Sets Light Cache as the secondary GI engine.

GI depth – Controls the number of secondary bounces for indirect illumination when Brute Force is used.