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API > API/Runtime > API/Runtime/Engine > API/Runtime/Engine/Materials > API/Runtime/Engine/Materials/UMaterialExpressionSubstrateSing-
Syntax
UPROPERTY ()
FExpressionInput WaterExtinction
Remarks
The rate at which light is absorbed or out-scattered by the medium. Mean Free Path = 1 / Extinction. (type = float3, unit = 1/cm, default = 0)