Kujambula kwa 3D ndi AutoCAD - Gawo 8

MUTU XUMUMX: SURFACES

Monga tafotokozera mu gawo la 36.2.2, pali mitundu iwiri ya zinthu zakuthupi: njira zamakono ndi malo a NURBS. Zonsezi zikhoza kulengedwa ndi njira zomwezo, monga extrusion kapena kutuluka kuchokera mbiri. Komabe, aliyense ali ndi zizindikiro zomwe zimatsimikizira mtundu wa kusintha komwe tingathe kuchita nawo. Kuona kali NURBS akhoza losasinthika ndi mfundo kulamulira, amene amapereka ufulu yaikulu sculpted pamwamba, monga taonera pansipa, koma ali ndi mwayi kuti iwo Sangathe kulenga iwo limasonyeza associative ndi mbiri kuti kuwapatsa chiyambi kapena ndi magulu ena a malo.
Kumbali inayi, malo opangidwira angagwirizane ndi malemba omwe amachokera kapena ku gulu la malo ndikukonzedwanso ngati chinthu chimodzi. Maganizo omwe tinali nawo kale ndi polylines. Izi zili tionetsa zofunika: Mukhoza ajambule 2D chinthu, ndi polyline Mwachitsanzo, ndi kukaniza zosiyanasiyana parametric monga anaphunzira mutu 12, izo tikhoza pamwamba adamulowetsa associativity ndondomeko. Zikatero, mukhoza kusintha pamwamba pogwiritsa ntchito polyline yomwe ikugwiritsidwa ntchito, yomwe idzapitirizabe kuyika malamulo omwe mwakhala nawo. Monga mukukumbukira, ngakhale zovuta za polyline zingakhale ndi masamu magawo ochokera ku zinthu zina. Mwachitsanzo, chigawo chozungulira cha arc chingakhale kawiri kukula kwa m'mphepete, ndi zina zotero.
Chifukwa chake, kugwira ntchito ndi ndondomeko ndi chiyanjano kumafuna kukonzekera, koma kungakuthandizeni kupanga malo omwe mawonekedwe a mawonekedwe akuthandizidwa bwino mu deta yanu. Ngati mumagwiritsa ntchito mapangidwe azinthu, muyenera kudziletsa kuti mukonze malo omwewo pogwiritsa ntchito mapulogalamu kapena malo ena omwe akugwirizanako. Ngati akuphwanya lamulo limenelo, kugwirizana ndikutayika ndipo sikungayambitsenso.
Mwachiwonekere, mungathe kukhazikitsa malo opangira popanda kusonkhana ndi zinthu zina. Pazochitikazi mungathe kuzikonza mwazomwe mukuziwona, zomwe zimawoneka mu mfundo zawo zazikulu ndi / kapena mazenera awo.
Mfundo ina yofunika kukumbukira ndi yakuti mukhoza kusintha ndondomeko pamwamba pa malo a NURBS, koma simungathe kusandutsa malo a NURBS kukhala njira imodzi. Komabe, ngati ndi chikhalidwe zolimba, ie, popanda mabowo, ndiye angathe kutembenuza kuti pamwamba kapena NURBS kali mu 3D olimba ndi ndiye nawonso, zikhoza kusinthidwa kubwerera kudera la ndondomeko. Ngakhale ziri zoona kuti muyenera kuyesa kupanga mafano anu a 3D ndi zochepa kwambiri zotembenuzidwa, popeza zikhoza kuchitika kuti mutayika katundu m'matembenuzidwe awa.
Koma tiyeni tiwone vidiyo yomwe timafotokozera tanthauzo lomwe tapanga pano ponena za mitundu iwiri ya malo omwe alipo.

Njira za 38.1 zopanga malo

Kaya mtundu wa kali kuti adzalenga (procedural kapena NURBS), njira kwambiri kulenga iwo adzakhala bwino, kuyambira zimatenga chimodzimodzi monga ife ntchito, kapena kudzatunga zinthu 2D, kapena ena Zolimba kuchokera ku mbiri. Tiyeni tiwone mwamsanga aliyense wa iwo.

38.1.1 Flat surface

Pali njira ziwiri kujambula pamalo athyathyathya: kujambula ngodya ina ya rectangle, amene nthawi zonse udzakhazikitsidwe pa XY ndege ya SCP panopa, koma adzaukitsidwa pa olamulira Z. Yachiwiri njira ndi kusankha mbiri chatsekedwa (bwalo, ellipse kapena polyline), mosasamala kanthu za malo ake mu malo a 3D.

38.1.2 Extrusion

Monga mukukumbukira pa nkhani ya zolimba, kutulutsa chinthu, tinangochiwonetsera ndiyeno tikhoza kutenga mtengo wamtali, kapena timasonyeza chinthu china chomwe chimagwira ntchito. Ngati tigwiritsa ntchito mbiri yotsekedwa, zotsatira zake zikhoza kukhala zolimba kapena zapamwamba ngati tikuzifotokozera ndipo ngati zili zotseguka, nthawi zonse zidzakhala zapamwamba ndi tanthauzo. Pachifukwachi, tikhoza kuwonetseranso malingaliro, omwe amagwiritsidwa ntchito pokhapokha ngati zotsatira zake sizikukhudzana zokha, pomwepo pamwamba pake sizingalengedwe.

Tsamba la 38.1.3

Ifenso angalenge pamwamba kusesa mbiri, lotseguka kapena chatsekedwa, pa njira chimafotokozera wina chinthu 2D ndi monga zinachitikira zolimba, akhoza ntchito kupindika pa chindodo kapena lonse kusinthidwa mu mbiri ya kukula kwake koyamba mpaka kukula kwake kotsiriza.