Unreal Engine 4.26 Documentation

Unreal Engine 4.27 Documentation

Unreal Engine 5.0 Documentation

Unreal Engine 5.1 Documentation

Unreal Engine 5.2 Documentation

Unreal Engine 5.3 Documentation

> Unreal Engine API Reference > Plugins > GPULightmass > UGPULightmassSettings > bUseFirstBounceRayGuiding

Light Theme

Dark Theme

bUseFirstBounceRayGuiding

If Irradiance Caching is enabled, First Bounce Ray Guiding will search the hemisphere over each first bounce sample to find the brightest directions to weigh the rest of the samples towards.

Windows

MacOS

Linux

Syntax

[UPROPERTY](Programming/UnrealArchitecture/Reference/Properties)(EditAnywhere, BlueprintReadWrite, Category=GlobalIllumination,
Meta=(EditCondition="bUseIrradianceCaching"))
bool bUseFirstBounceRayGuiding

Remarks

If Irradiance Caching is enabled, First Bounce Ray Guiding will search the hemisphere over each first bounce sample to find the brightest directions to weigh the rest of the samples towards. This improves results for interior scenes with specific sources of light like a window. The quality of this pass is controlled with the Trial Samples setting.

Help shape the future of Unreal Engine documentation! Tell us how we're doing so we can serve you better.

Take our survey

Dismiss