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Unreal Engine C++ API Reference > Runtime > Engine > Materials > UMaterialExpressionVolumetricAdvancedMaterialOutput
Syntax
bool bRayMarchVolumeShadow
Remarks
Disable this to use the cloud shadow map instead of secondary raymarching. This is usually enough for clouds viewed from the ground and it result in a performance boost. Shadow now have infinite length but also becomes less accurate and gray scale.