Mechanical Design Technology (Free-form Surface) April 28, /12
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1 Mechacal Desg echolog Free-form Srface Prof. amos Mrakam Assgme #: Free-form Srface Geerao Make a program ha geeraes a bcbc eer srface from 4 4 defg polgo e pos ad dsplas he srface graphcall a a ha allos he hree-dmesoal feares of he srface o appear comprehesvel Yo ll eed approprae hreedmesoal rasformao ad proeco Sppose he 4 4 defg polgo e pos are specfed as ] 4; Accordg o he defo of a eer srface a po o he srface P ] for he parameers s calclaed dvdg he parameer rage ] o 6 ervals 7 7 pos ] /6 /6 5/6 ad o he srface are calclaed; coecg he calclaed pos h les ad makg a lace a mesh o appromae he eer srface s obaed he program o re ll eed o be able o ed he shape of he srface b chagg he 4 4 defg polgo e pos ecase of he coordae ssem of a NC mllg mache ad he ork se sbseqel sed hs corse se he rgh-had coordae ssem ad he oreao ad vale rage for he parameers ad shold be as follos ad o corol he horoal rage of he srface: ; : 75 o corol he cove/cocave shape of he srface: Mechacal Desg echolog Free-form Srface Aprl 8 4 /
2 Sbmsso Wha s Epeced Oe pred cop of he graphcs scree dsplag he eer srface ad defg polgo e Do o sbm he sorce code of or program a hs me he program s sed for Assgme # so do o delee afer o fsh Assgme # Deadle e 4 a he ed of he lecre Room 8- eer Crve Defo Defg polgo pos: ] Crve parameer: eer/erse bass fco bledg fco: A po o he eer crve: P ] P ] ]!!! Mechacal Desg echolog Free-form Srface Aprl 8 4 /
3 Aprl 8 4 Mechacal Desg echolog Free-form Srface / Eample: Cbc eer crve P s defed as a eghed sm of here a egh for s Some properes of he eer crve he crve geerall follos he shape of he defg polgo Ol he frs ad las pos of he defg polgo ad he crve are cocde he degree of he polomal defg he crve s oe less ha he mber of defg polgo pos he crve s vara der a affe rasformao ] P
4 Rogers ad Adams 99] Mechacal Desg echolog Free-form Srface Aprl 8 4 4/
5 Rogers ad Adams 99] Mechacal Desg echolog Free-form Srface Aprl 8 4 5/
6 Aprl 8 4 Mechacal Desg echolog Free-form Srface 6/ eer srface Eeso of a eer crve o he srface Defo Defg polgo e pos: ] Srface parameers: eer/erse bass fcos bledg fcos: K m A po o he eer srface: P ] Eample: cbc eer srface m ] m m m m m K K P ] K K K K P
7 ] ] Some properes of he eer srface he srface geerall follos he shape of he defg polgo e Ol he corer pos of he defg polgo e ad he srface are cocde he degree of he srface each paramerc dreco s oe less ha he mber of defg polgo e pos ha dreco he srface s vara der a affe rasformao Mechacal Desg echolog Free-form Srface Aprl 8 4 7/
8 Rogers ad Adams 99] Mechacal Desg echolog Free-form Srface Aprl 8 4 8/
9 Rogers ad Adams 99] Mechacal Desg echolog Free-form Srface Aprl 8 4 9/
10 Rogers ad Adams 99] Mechacal Desg echolog Free-form Srface Aprl 8 4 /
11 Aprl 8 4 Mechacal Desg echolog Free-form Srface / hree dmesoal rasformao Ordar coordaes: ] Homogeeos coordaes: ] 4 4 rasformao mar: ] Composo of rasformaos Mar mlplcao Scalg Roao abo as Roao abo as Roao abo as raslao Referece Rogers D.F. ad Adams.A. Mahemacal Elemes for Comper Graphcs d ed. McGra-Hll 99. ] ] ] ' ' ' cos s s cos ] ] S S S ] cos s s cos ] cos s s cos ] ] ] ] Λ ] ] ' ' '
12 Implemeao H pblc class bcbc_beer_srface { prvae doble bass_fco doble { } } prvae vecord srface_popo_lace polgo_e doble doble { /* Loop for ad */ polgo_e.ge_po ; bass_fco ; bass_fco ; } pblc vod dragraphcsd g po_lace polgo_e doble]] mar { /* Loop for ad */ srface_popolgo_e.rasformmar; } Mechacal Desg echolog Free-form Srface Aprl 8 4 /
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