Hscript Expression

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1、HSCRIPTEXPRESSIONSAnimationandvisualeffectsarecreativefieldsbuiltonahighlytechnicalfoundationanditisimportanttobalanceyourartisticaspirationswithtechnicalknow-how.Houdini’snode-basedworkflowisdesignedtomakeCGtechnologymoreartist-friendlywhileprovidingyouwiththeflexibilitytoshapethingsanyw

2、ayyouwant.Expressionsofferanotherwaytoenhancethecreativeprocessbygivingyoucompletecontroloveryourscenedata.Tohelpyoulearnhowexpressionscanhelpyouinyourwork,SideEffectshaspostedan18lessonvideotutorialseriesalongwiththisdocument.Thismaterialcoversavarietyofsimpleyetessentialexpressionbuildin

3、gblocksincludingGlobal,StandardandCustomVariablesaswellasMathandStringModificationfunctions.UnderstandinghowexpressionscanbeusedeffectivelyinHoudiniiskeytogivingyourselfthecreativeedgeandallowingyoutounleashyourimagination!INTRODUCTIONATTRIBUTES,VARIABLESANDHSCRIPTEXPRESSIONSINHOUDINIATTRI

4、BUTES,WhenyoutypeavalueintoaparameterfieldinHoudini,youassignthisvaluetothatparameterVARIABLESANDandtheassociatednodereactsaccordingly.Ifyoutypethevalue“5”intotheTranslateXfieldofHSCRIPTanobject,thenitwillmove5unitsintheviewport,anditwillstaythereuntilyoutypeinanotherEXPRESSIONSnumber.Thes

5、evaluesmayalsobekeyedeachframe,andthusallowtheusertochangethevalues.overtimetoachievetheirdesiredanimation.Expressionsletyougobeyondthesesimpleconceptstoopenupanewworldofpossibilities.Throughoutthistutorialseries,youwilllearnhowdatacanbepassedtoparameterstoautomateavarietyofeffectswhilemai

6、ntainingtheabilitytogobackandmakechangeslater.ANATOmyOfANEXPRESSIONAnexpression,istypicallyanyvaluethatisnoteitherasimplestring(textsuchasafilepath)ornumber.Thiscanbesomethingassimpleasavariable,amathequationoranexpressionfunction.Inthisseries,wewillbelookingatHScriptExpressionFunctions(as

7、opposedtoPython)whicharenativetoHoudini.HScriptcanbeaveryfastandconcisewaytoretrieveandmanipulateinformation.Variablesareessentiallyaliases,shortcodewordswhichcallupinformationthathasbeenstoredsomewhereinyourfile(oreveninyouroperatingsystem).Theymaybeaccessedb