how does glDepthRange work? - Stack Overflow

glDepthRange specifies a linear mapping of the normalized depth coordinates in this range to window depth coordinates. Regardless of the actual ... 2022DeveloperSurveyisopen!Takesurvey. Home Public Questions Tags Users Companies Collectives ExploreCollectives Teams StackOverflowforTeams –Startcollaboratingandsharingorganizationalknowledge. CreateafreeTeam WhyTeams? Teams CreatefreeTeam Collectives™onStackOverflow Findcentralized,trustedcontentandcollaboratearoundthetechnologiesyouusemost. Learnmore Teams Q&Aforwork Connectandshareknowledgewithinasinglelocationthatisstructuredandeasytosearch. Learnmore howdoesglDepthRangework? AskQuestion Asked 9years,4monthsago Modified 9years,4monthsago Viewed 7ktimes 5 0 Myvertexcordsare: GLfloatvertices[]= { 0.5f,0.5f,0.5f, -0.5f,0.5f,0.5f, -0.5f,-0.5f,0.5f, 0.5f,-0.5f,0.5f,//face1 0.5f,-0.5f,-0.5f, -0.5f,-0.5f,-0.5f, -0.5f,0.5f,-0.5f, 0.5f,0.5f,-0.5f,//face2 0.5f,0.5f,0.5f, 0.5f,-0.5f,0.5f, 0.5f,-0.5f,-0.5f, 0.5f,0.5f,-0.5f,//face3 -0.5f,0.5f,0.5f, -0.5f,0.5f,-0.5f, -0.5f,-0.5f,-0.5f, -0.5f,-0.5f,0.5f,//face4 0.5f,0.5f,0.5f, 0.5f,0.5f,-0.5f, -0.5f,0.5f,-0.5f, -0.5f,0.5f,0.5f,//face5 -0.5f,-0.5f,0.5f, -0.5f,-0.5f,-0.5f, 0.5f,-0.5f,-0.5f, 0.5f,-0.5f,0.5f//face6 }; now,iamchangingzcordsby: for(inti=0;i<24;i++) vertices[i*3+2]*=10 glDepthRange(0,10.0); Now,iamexpectingthatzcordswillbemappedto-0.5to0.5rangeduetoglDepthRangecallandicanseeapropercube,butitgiveso/pasthatofwhenicommentglDepthRangecallabovewithdistortedgeometry. opengldepthdepth-bufferdepth-testing Share Improvethisquestion Follow askedJan7,2013at12:22 debonairdebonair 2,39544goldbadges2525silverbadges6060bronzebadges Addacomment  |  1Answer 1 Sortedby: Resettodefault Highestscore(default) Datemodified(newestfirst) Datecreated(oldestfirst) 6 Letmeciteyouthemanpages: Afterclippinganddivisionbyw,depthcoordinatesrangefrom-1to1,correspondingtothenearandfarclippingplanes.glDepthRangespecifiesalinearmappingofthenormalizeddepthcoordinatesinthisrangetowindowdepthcoordinates.Regardlessoftheactualdepthbufferimplementation,windowcoordinatedepthvaluesaretreatedasthoughtheyrangefrom0through1(likecolorcomponents).Thus,thevaluesacceptedbyglDepthRangearebothclampedtothisrangebeforetheyareaccepted. highlightsmine Inotherwords,youcan'treallyusedepthvaluesgreaterthan1;youhavetocalculatethemproperlybyyourself,instead.ItessentiallyconcludestosettingappropriatenearandfarvaluesinyourProjectionMatrixandtranslatingZcoordinateinyourModelviewMatrix,sothatallfinalZsarebetweentheaforementioned. Pleaseleaveacommentifyouneedmoredetailedexplanation. Share Improvethisanswer Follow editedJan7,2013at12:31 answeredJan7,2013at12:25 BartekBanachewiczBartekBanachewicz 37.6k77goldbadges8989silverbadges133133bronzebadges 2 Thanksforyourreply.Igotyourexplanationaboutthematrix.Butstillididnotget"glDepthRangespecifiesalinearmappingofthenormalizeddepthcoordinatesinthisrangetowindowdepthcoordinates"whatdoesitmean?canyougiveasmallexampleshowinghowglDepthRangeworks. – debonair Jan7,2013at12:44 It'sacomplicatedwaytosaythatyourcompressedrange(setbyglDepthRange)isstretchedinto(0,1):)(lookagainattheman-windowdepthvaluesarealwaystreatedastheyare(0,1))Iguessyoumightfinditquitenon-useful,butyoushouldn'tactuallyworryaboutit. – BartekBanachewicz Jan7,2013at12:54 Addacomment  |  YourAnswer ThanksforcontributingananswertoStackOverflow!Pleasebesuretoanswerthequestion.Providedetailsandshareyourresearch!Butavoid…Askingforhelp,clarification,orrespondingtootheranswers.Makingstatementsbasedonopinion;backthemupwithreferencesorpersonalexperience.Tolearnmore,seeourtipsonwritinggreatanswers. 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