OpenGL: What does glRotatef rotate? - Stack Overflow

glRotatef, like glMultMatrixf, is used to modify the currently selected transformation matrix. This has an effect on how things are drawn ... Lessthan10daystoRSVP!Virtuallyjoinusatourinauguralconference,everyoneiswelcome. Home Public Questions Tags Users Companies Collectives ExploreCollectives Teams StackOverflowforTeams –Startcollaboratingandsharingorganizationalknowledge. CreateafreeTeam WhyTeams? Teams CreatefreeTeam Collectives™onStackOverflow Findcentralized,trustedcontentandcollaboratearoundthetechnologiesyouusemost. LearnmoreaboutCollectives Teams Q&Aforwork Connectandshareknowledgewithinasinglelocationthatisstructuredandeasytosearch. LearnmoreaboutTeams OpenGL:WhatdoesglRotatefrotate? AskQuestion Asked 8years,1monthago Modified 8years,1monthago Viewed 13ktimes 8 3 WhenIcalltheglRotateflikethis: glRotatef(angle,0.0,1.0,0.0)//rotateabouty-axis Iknowitistorotatebyangledegreesabouttheyaxis. But,whatisbeingrotatedhere?Whichobjectexactly? Probablyasillyquestion,butI'mentirelynewtothis. Iwasabletorotatealineaboutit'sendpointusingtheanswerhere,butIdon'treallyunderstandhowitworksinternally. c++openglopengl-1.x Share Follow editedMay23,2017at12:10 CommunityBot 111silverbadge askedAug13,2014at18:19 sanjeevmksanjeevmk 4,23844goldbadges4040silverbadges6666bronzebadges Addacomment  |  2Answers 2 Sortedby: Resettodefault Highestscore(default) Trending(recentvotescountmore) Datemodified(newestfirst) Datecreated(oldestfirst) 8 Nothingisbeingrotated,becauseOpenGLdoesnot"store"objects. glRotatef,likeglMultMatrixf,isusedtomodifythecurrentlyselectedtransformationmatrix.Thishasaneffectonhowthingsaredrawnsubsequently.Onesetsthematrices(andotherstuff!)howonewants,andthenonedrawsone'sobjects. Formoreinformation,seetheOpenGLredbook,andgooglearoundforthedifferencebetween"retainedmode"and"immediatemode". Share Follow answeredAug13,2014at18:24 SneftelSneftel 38.7k1111goldbadges6969silverbadges103103bronzebadges 2 1 NotonlydoesOpenGLnotstoreobjects,itliterallyhasnonotionoftheconceptofobjects. – TomKnapen Aug13,2014at18:27 @sanjeevmkThetransformationmatrixisappliedtotheverticesyoupassinusingglVertex. – TomKnapen Aug13,2014at18:31 Addacomment  |  2 glRotatewillactonthecurrentmatrix,whichisbydefaultGL_MODELVIEW.Doingsowillaffectany3Dobjectthatyoudrawinthesequence.ThecurrentmatrixischangedwithglMatrixMode. Themodel-viewmatrixisthenappliedtoanygeometryrenderedwithglVertex,glDrawArrays,etc. OpenGL-sidematricesarenowdeprecated.IfyouusecoreOpenGL3+,thesefunctionsarenolongeravailable.IfyouarenewtoOpenGL,Isuggestthatyouskiplearningtheoldwaysandfocusonmodern,shader-orientedOpenGL.Youcancheckthefollowinglinksforsomegoodtutorials. open.gl opengl-tutorial.org ogldev Share Follow answeredAug13,2014at18:29 glampertglampert 4,27122goldbadges2222silverbadges4848bronzebadges Addacomment  |  YourAnswer ThanksforcontributingananswertoStackOverflow!Pleasebesuretoanswerthequestion.Providedetailsandshareyourresearch!Butavoid…Askingforhelp,clarification,orrespondingtootheranswers.Makingstatementsbasedonopinion;backthemupwithreferencesorpersonalexperience.Tolearnmore,seeourtipsonwritinggreatanswers. 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