The first bounce that Russian Roulette path termination can disable. (Editor only).
Russian Roulette is a technique that decreases the bake time by stochastically terminating the light path. Use this setting to define the first bounce that Russian Roulette can disable. Note that shorter paths may increase lightmap noise.
The range is -1 to 4. The default value is 2. Set this to -1 or 0 to disable Russian Roulette. Set this to 2 to ensure at least 1 bounce, 3 to ensure at least 2 bounces, and so on.
This setting affects lightmaps generated by the Baked Global Illumination system. It applies only when using the Progressive Lightmapper.
When Unity serializes this LightingSettings object as a Lighting Settings Asset, this property corresponds to the Russian Roulette Start Bounce property in the Lighting Settings Asset Inspector.
See Also: Lighting Settings Asset.