FVector ComputeDifference ( const [FPlacedMesh](API\Plugins\ProxyLODMeshReduction\IVoxelBasedCSG\FPlacedMesh) & PlacedMeshA, const [FPlacedMesh](API\Plugins\ProxyLODMeshReduction\IVoxelBasedCSG\FPlacedMesh) & PlacedMeshB, [FMeshDescription](API\Runtime\MeshDescription\FMeshDescription) & ResultMesh, double Adaptivity, double IsoSurface ) const