Brute force GI
Search Keywords: brute force, direct calculation, GI
This section is available only if you have chosen Brute force as either the primary or the secondary GI engine.
The brute force method for computing global illumination recomputes the GI values for every single shaded point separately and independently from other points. While very slow, this method is very accurate, especially if you have many small details in the scene.
To speed up brute force GI, you can use a faster method (the photon map or the light map) for approximating secondary GI bounces, while using the brute force method for the primary bounces.
Subdivs - this determines the number of samples used to approximate GI. Note that this is not the exact number of rays that V-Ray will trace. The number of rays is proportional to the square of this number, but also depends on the settings in the DMC sampler rollout.
Secondary bounces - this parameter is available only if brute force GI is selected as a secondary GI engine. It controls the number of light bounces that will be computed.