Fixed UE4.27 SkeletalMesh support

Author: gildor2

Unreal/UnrealMesh/UnMesh4.cpp

@@ -1677,6 +1677,7 @@ struct FStaticLODModel4
 	}
 
 	// UE4.24+ serializer for most of LOD data
+	// Reference: FSkeletalMeshLODRenderData::SerializeStreamedData
 	void SerializeStreamedData(FArchive& Ar)
 	{
 		guard(FStaticLODModel4::SerializeStreamedData);
@@ -1712,6 +1713,12 @@ struct FStaticLODModel4
 		FSkinWeightProfilesData SkinWeightProfilesData;
 		Ar << SkinWeightProfilesData;
 
+		if (Ar.Game >= GAME_UE4(27))
+		{
+			TArray<uint8> RayTracingData;
+			Ar << RayTracingData;
+		}
+
 		//todo: this is a copy-paste of SerializeRenderItem_Legacy code!
 		guard(BuildVertexData);