Umbhobho wombhobho luhlobo loxinzelelo, kwaye ulwelo kufuneka lube phantsi koxinzelelo lokusebenza ngokwesiqhelo. Olu hlobo lokuncamathisela lunokuvelisa ikona ebanzi ye-cone yokutshiza nge-engile yokutshiza malunga ne-60 ° -90 °. Esi sixhobo sixhasa ulwenziwo, nceda unxibelelane nathi.