bCompressLightmaps

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

Syntax

UPROPERTY (BlueprintReadWrite, EditAnywhere, Category=LightmassGeneral, AdvancedDisplay)  
uint8 bCompressLightmaps: 1  
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Remarks

Whether to compress lightmap textures. Disabling lightmap texture compression will reduce artifacts but increase memory and disk size by 4x. Use caution when disabling this.