Ukucoca ityhubhu yoxinzelelo oluphezulu eyenziwe kuthi isetyenziswa ngokubanzi kumacandelo okucoca udonga lwangaphakathi, imibhobho yokucoca udonga lwangaphakathi kunye namanye amasimi. Phakathi kwabo, ukucoca udonga lwangaphakathi lwesikhongozeli yeyona nto inzima. Ngenxa yomahluko kububanzi bodonga lwangaphakathi lwesikhongozeli ekufuneka lucociwe, siyile kwaye saphuhlisa ngokweedayimitha ezahlukeneyo. Uthotho lweemilomo yokucoca itanki lunokukhawulelana neemfuno zesicelo.

Imilomo yokucoca itanki yahlulwe yaziindlela ezintathu zokucoca. Iyokuqala ngumlomo wokucoca ohleliweyo. Umbhobho awunazinto zihambayo emzimbeni wonke. Zonke zilungisiwe. Umzimba wonke wombhobho ugcwaliswe ngombhobho ogcweleyo, onokutshiza kwisikwere ngasinye. Ukuze kuhlangatyezwane neemfuno zokucoca ngokubanzi kudonga lwangaphakathi lwesikhongozeli.

Uhlobo lwesibini yi-axis enye ejikelezayo yokucoca umlomo. Intloko yayo yokutshiza inokujikeleza kuphela kwindawo yokuluka yomsonto wombhobho, ke ulwalathiso lwayo lokutshiza luqhele ukubonakala njenge fan, kuba inokugubungela ngokupheleleyo umphezulu wangaphakathi wesikhongozeli.

Uhlobo lwesithathu ngumbhobho ojikelezayo we-3D, ongahambisi kuphela ujikeleze umsonto wokuluka, kodwa ujikeleze i-axis yombhobho ojikelezayo, ukuze nokuba uphehle inqaku, unokucocwa ngokupheleleyo emva kwexesha elithile ujikelezo. Kudonga lwangaphakathi lomgqomo, amandla efuthe lale mibhobho mikhulu kakhulu, ke kufanelekile ukuba kucocwe udonga lwangaphakathi lwezikhongozeli ezinobubanzi obukhulu.