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> Unreal Engine API Reference > Plugins > MovieRenderPipelineRenderPasses > UMoviePipelineDeferredPassBase > bAccumulatorIncludesAlpha

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bAccumulatorIncludesAlpha

Should multiple temporal/spatial samples accumulate the alpha channel? This requires r.PostProcessing.PropagateAlpha to be set to 1 or 2 (see "Enable Alpha Channel Support in Post Processing" under Project Settings > Rendering).

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Syntax

[UPROPERTY](Programming/UnrealArchitecture/Reference/Properties)(EditAnywhere, BlueprintReadWrite, Category="Settings")
bool bAccumulatorIncludesAlpha

Remarks

Should multiple temporal/spatial samples accumulate the alpha channel? This requires r.PostProcessing.PropagateAlpha to be set to 1 or 2 (see "Enable Alpha Channel Support in Post Processing" under Project Settings > Rendering). This adds ~30% cost to the accumulation so you should not enable it unless necessary. You must delete both the sky and fog to ensure that they do not make all pixels opaque.

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