Stepsinmakingamultivieworthographicprojection
Inthefigurebelow,theupper-rightquadrantshowsantrimetricprojectionofourobject.Theotherquadrantsshowthe
orthographicprojections,Front,TopandRight,allthreecompriseaMultiviewSketchordrawing.Howdowegetthem
andhowaretheygraphicallyrelated?Thereisspecificscaleforthissketch,howeveryoudoneedtogettheproportions
right(aswediscussedinLecture2):theratiosbetweenHeight,WidthandDepthmustbecorrect.
W
Top
H
Front
Right
D
First,decideonwhichwillbetheFront,theTopandRightviews.Thiscanbeachievedfollowingtheguidelines
presentedinlecture3.
Next,putaborderandtitleblockin,andthenfigureouthowtodivideupthespaceforthe3views.Asafirst
approximation,dividetheinnerareainto“quarters”asshownabove,butadjusttopandbottompairsaccordingtothe
relativesizesofHeightandDepth.SinceHeightisclearlylargerthanDepth,startbymakingthebottomportionabit
largerthanthetop.SinceDepthandWidthareaboutthesame,makeleftandrightportionsaboutequal.Lateronyou
maydecidetoskipthisprocess.
Rememberthe“glassbox”modelofputtingtheobjectinsideaboxandprojectingout.Thinkofthedividinglines(redin
thefollowingfigures)asthe“foldinglines”orEdgeswherefacesoftheglassboxmeet.Usetheseasthefoldinglinesof
yourmultiviewsketch.
TITLEOFDRAWING
NameStudentIDLabSectionDate
Next,puttheFrontboundingboxinthelowerleftarea.ThekeyratioisHeighttoWidthsincetheFrontviewshows
onlythose2dimensions.Howbig?Asbigaspossible,butleavelotsofroomforallnecessarydimensions.Putitmoreor
lessinthemiddle:
TITLEOFDRAWING
NameStudentIDLabSectionDate
Next,placetheboundingboxforthetopview.TheratiowillofcoursebeWidthtoDepth(itistheTopview,afterall!).
First,putverticalprojectionlinesupfromtheverticesoftheFrontboundingbox:
TITLEOFDRAWING
NameStudentIDLabSectionDate
Next,sketchaboundingboxfortheTop.Theleftandrightsideswillofcoursebeontheprojectorsyoujustdrew(why?)
soallyouhavetodoisfigureouthowhightomakeit,andwheretoputthelowerboundary.Howhigh?TheDtoW
ratiospecifiesthat.Where?Highenoughtoleaveroomfordimensions(andnotes,etc.).
2
1
1
TITLEOFDRAWING
NameStudentIDLabSectionDate
NowsizeandplacetheboundingboxfortheRview.Butyou’vealreadydonealmostalloftheworkforthis!First,
projectthetopandbottomoftheFviewovertotherightviewarea(“1”).Second,decidewheretheleftsideoftheR
viewwillgoandputaverticallinethere,projectingitupintothetoprightarea,abovethebottomoftheTview(“2”).
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3
P
2
1
1
TITLEOFDRAWING
NameStudentIDLabSectionDate
You’realmostdone!First,sketchaprojectionline”3”fromthebottomoftheTviewovertotherightuntilitintersects
theverticalprojection“2”,andthensketchthe“Miter”line“4”fromtheintersectionpoint“P”upandtotheright.
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6
1
BB-R
1
TITLEOFDRAWING
NameStudentIDLabSectionDate
Almostthere.Now,drawprojector“5”horizontallyfromthetopofTtothemiterlineandthenfromthatintersection,
verticallydown“6”tointersectprojectorlines“1”.That’sit!JustfillintheboundingboxforR,“BB-R”.
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TITLEOFDRAWING
NameStudentIDLabSectionDate
Next,dothenextleveldownofboundingboxes,aswedidinLecture2,beingcarefultomakesuretoprojectbetween
viewssothesizesandlinesandplanescorrespondastheyshould.Hereweaddline“8”and“9”forthe‘back’ofthe
bracket,“10”forthebottom,anddarkentheappropriatelines(“7”)tomakethem‘visible’.
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TITLEOFDRAWING
NameStudentIDLabSectionDate
Next,putthe“notch”intotheFviewandprojectituptoT(“11”),andrighttoR(“12”)togetthelocationofthehidden
linerepresentingthenotchinR.PutinthecorrespondingvisibleandhiddenlinesinTandRviews.
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TITLEOFDRAWING
NameStudentIDLabSectionDate
Addthehole,firstinTwhereit’sseenintrueshape,thenprojectdowntoFtogetthehiddenlinesoftheedgeofthe
hole,andthenovertothemiterlinefromT,thendowntoRtogetthesideviewofthehole,hiddenlinesofcourse.
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TITLEOFDRAWING
NameStudentIDLabSectionDate
Thelaststepsaretoaddthelinesforthecut-offcornerofthebottomofthebracket,andaddcenterlinesforthehole.
Theprojectorlinesorthisarenotlabelledintheaboveillustration.