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The following parameters are added to the list of visible settings available from the Global Switches rollout when set to the Advanced Render UI Mode.

 

 

Force back face culling – Enables or disables (default) back face culling for camera and shadow rays. When this option is enabled, the surfaces of objects which are turned away from the camera (or the light source, when tracing shadows) appear fully transparent. This enables a camera outside a closed object to see inside it.

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Adaptive lights – Uses information from the Light cache to determine which lights to sample. If a Light cache is not used, uniform sampling is used. Depending on the scene, it can be faster than the Full lights evaluation mode.
Full lights evaluation – V-Ray goes through each scene light and evaluates it at each shading point. In scenes with many lights and lots of GI bounces, this leads to a lot of shadow rays being traced and rendering can become extremely slow.  
Light tree 1 – V-Ray randomly selects a variable number of suitable finite light sources based on proximity and evaluates only those. This mode may speed up the Light Cache and Brute Force calculations for scenes with lots of lights. It can also reduce flickering due to missed light sources. 

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