I Pick ~oint < 1 JUstification:
MO TRlIONG VE 3D
9.1. H¢ TOA vI) NGliOI DUNG V A cAcH NH~P fJlEM 3D 9.1.1. H~ tQa do ngulri dung UCS
Bim ve AutoCAD dUQ'c d~t trong h~ tr\lC tQa d~ chuan co d!nh WCS. Ban ve 2 chien (2D) chi -llh~p t<;>a d<> x, cho nen dung h¢ tI1,lc nay Ia duo NhllI1g vo; ban ve 3 chieu, (3D) thuang phai cho cae diem trong khOng gian b&tg c3. 3 tQa d(J x,y.z. do do ACAD cho phep b~n til t<:t0 Ca cae h~ tru.c rieng ella b~, gQi 13. h~ 1I¥c nguai dung ues de chuyen sang ve 2D (xem chuang I, tit't 1.2). Ole phuong pMp djnh nghI. h¢ tnlc UCS hOi l~nh UCS nhu sau:
L~NHUCS
'" each gQi ,1¢nh tir menu:
,---~,
Screen menu> ues Menu bar> Setting> ues '" Go l~nh tu ban phim:
Command: ues
Origin/ZAxis/3pointiEntityiYiew/XIYIZIPrev/Restore/Savei Del/?I<World>: Ok h,ta chQn co y nghia nhu sau:
_ Dar 0: tjoh tien goc (Origin) h¢ trl:1C ues den di~m kh<ic, hlIang cae tn,lc x, y, z kh6ng d6i.
_ ZA: chuy~n ues len phia tren thee chieu dlIong trl,lc z:
. + Origin point<O,O,O>: <chQn di~m lam g6c mai>
+ Point on positive portionof Z-axis< ... >: <chQn I diem a phan duang cua trl,lc z>
~ 3: chuytn UCS toi g6c mai, hlIOng x,y moi dl,ta trl!n 3 diem cho:
+ Origin point<O,O,o>: <chQn diem g6c mai > + Point on positive portionor X-axis< ... >: <chQn I di~m a phan duong
clla tn~c x>
+ Point on positive -Y portion of the UCS XV plane < ... >: <chQn diem b phin Y dlIang trong m~t ph~ng XV>
_ E: xac d!nh UCS mai bang each chi vao mQt nguy~n tM nao da: co (trtt 3Dpline, mesh hay b Viewport).
_ V: thiet l~p UCS mai co m~t ph~ng XY song song vai m~m hlnh cua bl;ln, g6c kh6ng thay dOi.
_ X/Y (Z: quay M UCS hi¢n tl;li quanh tf\lc x, ho~c y, ho~c z. _ P: tay ll;li ues tmac do. ACAD co hru ll;li 10 h¢ UCS sau cung. _ P: tay ll;li ues tmac do. ACAD co hru ll;li 10 h¢ UCS sau cung. _ R: gQi ra UCS da: llID.
_ S: llID UCS voi ten bl;ln tt! di;it (t~n UCS co th~ dili 31 ky U!). D: xoa d.c UCS dfi llID.
= W: dua h~ UCS ve trimg vai h¢ tQa dQ chuan WCS. U):NH UCSICON
~ b;;m de hlnh dung h¢ tryc tQa dQ, ACAD dua ra cac bi~u tuqng (icon) tren man hlnh. Tuy lo~i h~ tf\lc WCS, UCS hay tuy mOi Viewport rna bieu tuqng co dl;lng khac nhau. B'.ln thay d6i hi¢n, tat, dua icon tai goc tQa d¢ ... bang l~nh UCSICON:
* Cach gQi l¢nh ttt menu:
Menu bar> Setting-> UCS> icon * Go l¢nh ttr bim phim:
Command: UCSlcon
ON!OFF! ALLINoorigin! ORigini<. .. >1: _ Dap ON/OFF: hien th! hay tat icon. _ ALL: cac thay dOi dugc gan vai tat cii cac Viewport.
_ N: hi¢n icon b goc duai-trai.
_ OR: hi~n icon tl;li goc h¢ tfl;lc.
Vi d~: Cho hlnh nem (hlnh 9·11. vo
duemg th~ng di qua die diem giiia E, F cua BC, AD r6i ve duang tron nam trong m~t phfing ABeD, co tilm Ul di~m giiia EF, ban k(nh 40mm.
Command: UCS
c
Hinh 9-1
Origin!ZAxis!3pointiEntity!ViewIXlY!ZlPreviRestoreiSaveiDeli?!<World>: 3 Origin -point<O,O~O>: <chQn dit'!m A b~g Osnap modes! END>
Point on positive portionof X-axis< ... >: <chQn D> Point on positive -Y portion of the UCS XY plane < ... >: '<chQn B>
Command: line
From point: <dung Osnap modes/ MID chi v~o do~n AD> To point: < dung Osnap modes/ MID chi vila do*n Be>
To point: .J
Command: circ1e
3P!2P{lTR/<Center point>: <dung Osnap modes/MlD va chi vila EF> Diameter/<Radius>: 40 .J
eM thich: huang tryc z trong hi) ues duqc xac djnh theo quy h1c ban tay phai; tuc Iii. &.it ngon cii theo chit"u ducmg x, ngon tro thea chi6u ducmg y va g~p ngon giG'a vuClng g6c vai long ban tay thl n6 chi chi~u· uuong tryc z.
9.1.2; Cac each nh.i> dii!m 3D
• Ta co cac phuC1ng phap nhtJ.p diim 3D nhu sau - Cho t9a d~ tuy~t d6i: x,y,z
- Cho tQa d(> tucmg d6i: @x,y,z so vai diem truoc do xl,yl,zl.
- Cho' tQa d(> tn,l WOllg d6i: @p<<p, z trong do: p Ii khoang each til diem vi! tai diem truoe do, cp lit gee tir trl,lc.x tai di~m ve (trong XV), con z 13. tQa d(> thee tfl,lC z.
- Cho tQa d(> cAu wong d6i: @p«p<cr trong do p 13 khoang each tir diem vi! loi diem trube do, <p HI goc lit diem ve so voi tf\lc x (trong XV), a Ii goc tit m~t phing (XY) toi diem vo (xem hinh 9·3).
- Dung phim pick chu¢t.