Image Space vs Object Space
Nyob rau hauv 3D lub computer animation dluab yuav tsum tau muab cia rau hauv thav duab tsis converting ob seem arrays rau hauv peb cov ntaub ntawv. Qhov kev hloov dua siab tshiab no tshwm sim tom qab ntau qhov kev suav xws li kev tshem tawm qhov chaw zais, duab ntxoov ntxoo thiab Z buffering. Cov kev suav no tuaj yeem ua tiav hauv Image Space lossis Object Space. Cov algorithms siv nyob rau hauv cov duab qhov chaw rau nkaum qhov chaw tshem tawm yog ntau npaum li cas ntau npaum li cas qhov chaw algorithms. Tab sis cov khoom siv qhov chaw algorithms rau kev tshem tawm qhov chaw zais yog ua haujlwm ntau dua li cov duab qhov chaw algorithms rau tib yam. Kev sib xyaw ua ke ntawm ob lub algorithms no muab cov txiaj ntsig zoo tshaj plaws.
Image Space
Tus sawv cev ntawm cov duab hauv daim ntawv ntawm Raster lossis duab plaub pixels tau dhau los ua neeg nyiam heev. Raster zaub yog hloov tau yooj yim vim lawv tseem ua rau lub vijtsam tshiab los ntawm kev noj cov txiaj ntsig khaws cia hauv thav duab tsis zoo. Duab qhov chaw algorithms yog qhov yooj yim thiab ua tau zoo vim lawv cov ntaub ntawv qauv zoo ib yam li cov ncej tsis. Qhov feem ntau siv duab qhov chaw algorithm yog Z buffer algorithm uas yog siv los txheeb xyuas qhov tseem ceeb ntawm z ua haujlwm ntawm qhov khoom.
Object Space
Space object algorithms muaj qhov zoo ntawm kev khaws cov ntaub ntawv cuam tshuam thiab vim tias muaj peev xwm no kev sib cuam tshuam ntawm algorithm nrog cov khoom ua tau yooj yim dua. Kev suav ua rau cov xim yog ua tiav ib zaug. Object space algorithms kuj tso cai rau cov duab ntxoov ntxoo kom nce qhov tob ntawm 3 qhov khoom ntawm qhov screen. Kev koom ua ke ntawm cov algorithms no tau ua tiav hauv software thiab nws nyuaj rau kev siv lawv hauv kev kho vajtse.
Dab tsi yog qhov txawv ntawm Duab Chaw thiab Qhov Chaw Khoom
• Duab chaw algorithms muaj txiaj ntsig ntau dua li qhov khoom siv qhov chaw algorithms
• Object space algorithms ua haujlwm ntau dua li duab qhov chaw algorithms
• Xim xam hauv cov khoom qhov chaw algorithms tsuas yog ua tiav ib zaug thiab khaws cia los ntawm nws tab sis hauv cov duab qhov chaw algorithm kev suav ib zaug ua tiav yog sau tom qab.
