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API > API/Runtime > API/Runtime/Engine > API/Runtime/Engine/Materials > API/Runtime/Engine/Materials/UMaterialExpressionSubstrateSlab-
Syntax
UPROPERTY ()
FExpressionInput SSSMFP
Remarks
Chromatic mean free path . Only used when there is not any sub-surface profile provided. (type = float3, unit = centimeters, default = 0)