lesson-2-GC-Lesson 2

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1、GenerativeComponents101Lesson2:CreatingaGlobalVariableYikes,whatisaglobalvariable?LetsstartwithanewScriptFile.GotoFile>NewScriptFileorusetheNewScriptFiletool.TheCreatingnewscriptfiledialogtellsusthatallfeatureswillbedeletedfromthecurrentgraph.Thisisok!Don’tworryabouttickinganyextrab

2、oxesatthisstage.Clickok.Glossary:GlobalVariable.GlobalVariablesworkinahierarchicalsituation.AGlobalVariablewillcontrolallelementsorconstructionsthatreferencetoit.WhenyouchangetheGlobalVariableallreferencestothatvariablewillchangealongwithit.LiketheGlobalVariablecalledboss–whenbosssa

3、ysyouallhavetoworktill9pmalltheworkersobey!Inthisexercisewearegoingtocreateapyramidthatusesaglobalvariablefortheheight.LetscreatethisGlobalvariablefirst!IntheGCdialoggotoGraph>ManageGlobalVariables.YourGCdialoghasswitchedfromtheScriptfiletabtotheVariablesTab.ClickonAddtocreateanewva

4、riableandgivethevariablethenamePyramidHeight.ChangetheValuefromNullto5forexample.AtthebottomofthedialogyouwillseeLowlimitandHighlimitvalueboxes.Letssetyourlowestlimitto1andyourhighestlimitto10.Noticeourvalueof5sitsbetweenthesetwolimits.Onceyourhaveplacedyourlimitsyouwillnoticeaslide

5、rappearunderAnalogvalue.MovethissliderbartochangeyourvaluedowntoyourLowlimitoruptoyourHighlimit.Ok,nowweneedtodrawthepyramid!Istartwith3points?Exactly.Place3pointsonyourscreen.Nowjoinupyourpointswith3lines.RememberyouarecreatingthefeatureLine>ByPoints.Sofarourscreenlookslikethis:Now

6、weneedtodefinethemiddleofourtriangleandplaceapointinit.TodothiswecanplacethefeaturePoint>CentroidOfSet.Weneedtoinputallthepointsinourinputdialog.HolddowntheCTRLkeyandhoveroveryourfirstpoint,dataorreturntoacceptthentypeacoma,holddowntheCTRLkeyandhoveroveryoursecondpoint,thenplaceanot

7、hercoma,lastlyyourthirdpoint.Nowbecausewecreatedasetweneedtoplacesomecurlybrackets{}ateitherendofyoursetbeforeweentertoconfirmtheselection.Don’tforgettohitapplytoseeyourpointappear.Glossary:{}.Curlybracketsareusedtodefinesetseg{point1,point2,point3}.Scriptfile:transactionmodelBased"

8、PlaceCentroidPoint"