NumIndirectLightingBounces

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Unreal Engine C++ API Reference > Runtime > Engine > GameFramework > FLightmassWorldInfoSettings

Syntax

UPROPERTY (BlueprintReadWrite, EditAnywhere, Category=LightmassGeneral,  
          Meta=(UIMin="1.0", UIMax="10.0"))  
int32 NumIndirectLightingBounces  
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Remarks

Number of light bounces to simulate for point / spot / directional lights, starting from the light source. 0 is direct lighting only, 1 is one bounce, etc. Bounce 1 takes the most time to calculate and contributes the most to visual quality, followed by bounce 2. Successive bounces don't really affect build times, but have a much lower visual impact, unless the material diffuse colors are close to 1.