2024 Tus sau: Leah Sherlock | [email protected]. Kawg hloov kho: 2023-12-17 05:37
Cov txheej txheem ntawm kev kos lub vase yog ib theem ntawm kev qhia kev kos duab hauv tsev kawm kos duab. Cov menyuam kawm ntawv ntawm cov tsev kawm ntawv no feem ntau pleev xim rau marble lossis plaster. Yog tias koj yog tus neeg nyiam ua yeeb yam, xaiv lub vase zoo tshaj plaws.
Nyob rau hauv rooj plaub no, nws yog qhov zoo dua los kos rau ntawm daim ntawv tso rau hauv vertically. Txawm li cas los xij, yog tias koj muaj lub vase uas tsis tshua muaj, cov nplooj tuaj yeem muab tso rau hauv kab rov tav.
Thaum thawj theem, pib ua haujlwm ntawm yuav ua li cas kos lub vase, peb txiav txim siab qhov axis ntawm peb daim duab. Txhawm rau ua qhov no, kos ib txoj kab ntsug hauv nruab nrab ntawm daim ntawv thiab, kos ib qho perpendicular rau nws nyob ze ntawm ntug hauv qab ntawm daim ntawv, teeb tsa txoj hauj lwm hauv qab ntawm lub vase. Los ntawm qhov taw tes mus rau ntawm txoj kab ntsug, peb txiav txim siab qhov siab ntawm lub vase. Nyob rau tib lub sijhawm, kab mus rau sab saum toj ntawm daim ntawv yuav tsum muaj chaw rau paj.
Yuav kom nkag siab yuav ua li cas kos lub vase, koj yuav tsum paub seb nws muaj qhov twg. Nws tuaj yeem muaj qhov convex, lub caj dab, qee cov ntsiab lus. Hauv peb qhov piv txwv, qhov no yog ib qho convex kheej kheej thiab lub caj dab cylindrical. Nws yuav tsum tau txiav txim siab ntawm qhov siab li cas pib thiablub caj dab xaus, qhov twg feem ntau convex feem nyob, thiab kos lub teeb kab rov tav los ntawm cov ntsiab lus no. Cov no yog cov pab pawg, thiab nws yog qhov zoo dua los kos lawv nrog cov cwj mem nyuaj yam tsis muaj qhov siab.
Tom ntej no, koj yuav tsum paub qhov sib piv ntawm qhov dav ntawm lub vase thiab nws qhov siab ntawm qhov sib txawv, nrog rau nws tus kheej qhov chaw hauv thickness rau ib leeg. Kos rau ntawm kab kab rov tav ntu kwv yees li qhov sib npaug ntawm lub caj dab, qhov convex. Tam sim no koj yuav tsum txuas cov ntsiab lus kawg ntawm cov ntu no nrog cov kab nyias, saib qhov sib luag ntawm sab xis thiab sab laug ntawm cov khoom.
Peb xam pom qhov contours ntawm lub nkoj. Tam sim no peb yuav tsum xav txog yuav ua li cas kos lub vase kom nws zoo li qhov tseeb. Hauv qab, caj dab ntawm cov khoom thiab qhov sib txuas ntawm cylindrical ib feem nrog lub kheej kheej, raws li txoj cai ntawm kev xav, feem ntau yog kos rau hauv daim ntawv ntawm ib lub ellipse. Tshem tawm cov kab ntxiv uas koj tau siv los tsim nrog lub lwv thiab voj voog koj daim duab raws li tus qauv.
Yuav ua li cas kos lub vase kom pom qhov ntim ntawm cov khoom? Cov yam ntxwv ntawm cov duab ntawm cov khoom yog xa los ntawm lub teeb chiaroscuro. Ib txwm, thaum thov cov duab ntxoov ntxoo hauv daim duab, thawj zaug txiav txim siab los ntawm sab twg lub teeb poob rau koj. Qhov chaw nyob deb ntawm lub teeb pom kev tsaus, thiab vice versa. Tib yam tuaj yeem hais txog qhov chaw concave thiab convex ntawm lub vase. Thaum hatching, sim ua raws li cov contours ntawm cov khoom nrog cov kab, txawm hais tias ncaj qha hatching nyob rau hauv ntau cov lus qhia kuj ua tau. Ua ntej, kos qhov feem ntau concave thiab feem ntau convex ntawm lub nkoj nrog chiaroscuro thiab tsuas yog tom qab ntawd pib nthuav dav.
Ua tib zoo saib xyuas caj dab. Ntawm no koj yuav tsum tau muab cov duab ntxoov ntxoo kom pom tias koj tuaj yeem tso paj rau hauv lub vase. Txij li thaum muaj lub teeb me me los rau hauv, ua ib qho ntxoov ntxoo tsaus rau hauv qhov chaw no.
Thiab thaum kawg, ua tiav qhov no ntawm daim duab, koj tuaj yeem xav txog yuav ua li cas kos lub vase ntawm paj. Qhov no tsis yog qhov nyuaj heev yog tias koj piav qhia txhua lub paj nyob rau hauv daim ntawv ntawm lub voj voog, hauv qhov contour uas lub paj yuav nyob.
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