
AutoCAD2011ProductivityStudy
12 ©2010DavidS.Cohn
• InAutoCAD2008,thewallsandroofsofthepavilioncanbecreatedbyloftingtocreatesurfaces.
However,sincethereisnoassociativitybetweenthesurfacesandtheguidecurves,whentheguide
curvesaremodified,ifthechangesareminor,itispossibletoalsoselectandmodify
thesurfaces,but
inmostinstances,thefastestwaytoupdatethemodelistodeletetheprevioussurfacesandthen
createnewsurfacesbyloftingagainbetweenthemodifiedcurves.Inordertocreatetheskylight
opening,youhavetoprojectaplanviewofthelowerroofand
thenuseitsboundariestocreatea
solidthatcanbesubtractedfromtheupperroof.Whenadditionalchangesaresubsequentlymadein
thefifthdesigniteration,thisprocessmustberepeatedagain.
• InAutoCAD2011,thewallsofthepavilioncanbecreatedbylofting(asin2008)and
theroofscreated
aseithernetworkorpatchsurfaces.Thankstotheassociativitybetweenthesurfacesandtheguide
curves,whentheguidecurvesaremodifiedtocreatethesubsequentdesigniterations,thesurfaces
immediatelyupdatetoreflectthosechanges.Theskylightcanbecreatedbyprojectingcurvesonto
the
roofsurfaceandthenthosecurvescanbeusedtotrimtheopening.Whenfurtherchangesare
madeinthefifthdesigniteration,theassociativityagaincausesthesurfacestoimmediatelyreflect
thechangestotheunderlyingcurves.
Thisdrawingtook34minutestocompleteusingAutoCAD2008.Thesamedrawing
tookonly17minutesto
completeusingAutoCAD2011,animprovementof50percent.
Task#5:3Dconceptualdesignstudy
AutoCAD2011was50percentmoreefficientinthecreationofthetask#5drawing.Themostsignificant
improvementwastheimprovedworkflow.Insteadofhavingtodeleteandre‐createsurfaceseachtimethe
shapeofthepavilionwasmodified,curveassociativityinAutoCAD2011enabledthesurfacestoimmediately
updatetoreflectthosechanges.
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AutoCAD2011 AutoCAD2008
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