BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  OpenGL          BorlandTalk.com Forum Index -> Delphi Graphics View previous topic :: View next topic   Author Message Tanju ÖZGÜR Guest Posted: Tue Feb 07, 2006 10:01 am    Post subject: OpenGL Hi folk ! 1.) In OpenGL, what can I do to fix the problem at the attached file, edges rendering doesn't satisfy me and also when I'm rotating objects (or translating) edges seem very ragged. Thnx! Back to top Andrew Jameson Guest Posted: Tue Feb 07, 2006 11:01 am    Post subject: Re: OpenGL You might consider using ARB_MULTISAMPLE, there's an example at : http://nehe.gamedev.net/lesson.asp?index=10 You could also turn on the card's anti-aliasing (if supported) but this can be difficult to control from an application. I recollect some examples that do this and I think that they're available from the above link. Anti-aliasing and multi-pass rendering can introduce a significant performance hit and another suggestion (if you're running in fullscreen) is simply to increase the screen resolution which is what we do with our OpenGL product. There are a few other techniques for edge blurring and I would strongly suggest posting this question on the OpenGL forum at www.opengl.org. Andrew "Tanju VZG\R" <tanjuozgur (AT) yahoo (DOT) com> wrote in message news:43e86209$1 (AT) newsgroups (DOT) borland.com... Quote: Hi folk ! 1.) In OpenGL, what can I do to fix the problem at the attached file, edges rendering doesn't satisfy me and also when I'm rotating objects (or translating) edges seem very ragged. Thnx! Back to top Andrew Jameson Guest Posted: Tue Feb 07, 2006 11:01 am    Post subject: Re: OpenGL Just refreshing my memory - I gave up fighting the jaggies but there's lots of ideas around : http://www.edm2.com/0603/opengl.html Try Googling ! Andrew Quote: 1.) In OpenGL, what can I do to fix the problem at the attached file, edges rendering doesn't satisfy me and also when I'm rotating objects (or translating) edges seem very ragged. Thnx! Back to top Tanju ÖZGÜR Guest Posted: Tue Feb 07, 2006 1:02 pm    Post subject: Re: OpenGL Thnxs helping me, It doesn't sound like a good idea to turn on anti-aliasing which doesn't eliminate the jaggy edges but blurr them with nearby pixels. It seems to me that I didn't specify the front and back surface of objects so that, drawing for back and front surface is made randomly. First front surface is drawn and then back surface is drawn on top of the front surface or vice versa. Could this be a thing that I'm missing in my program ? "Andrew Jameson" <softspotsoftwareNO (AT) SPAMgmail (DOT) com>, haber iletisinde þunlarý yazdý:43e873b6 (AT) newsgroups (DOT) borland.com... Quote: Just refreshing my memory - I gave up fighting the jaggies but there's lots of ideas around : http://www.edm2.com/0603/opengl.html Try Googling ! Andrew 1.) In OpenGL, what can I do to fix the problem at the attached file, edges rendering doesn't satisfy me and also when I'm rotating objects (or translating) edges seem very ragged. Thnx! Back to top Andrew Jameson Guest Posted: Tue Feb 07, 2006 1:02 pm    Post subject: Re: OpenGL I think that we'd have to see your code to have a chance of helping further - just need the rendering code, although even though you're not culling faces, I can't see why that would generate jaggies. Anti-aliasing comes in many guises and it doesn't necessarily simply 'blur' edges. If you're new to the world of OpenGL, I listed a load of good OpenGL sites in a previous thread but top of my list is : http://www.sulaco.co.za/ You'll find lots of excellent examples by the late Jan Horn ... Andrew Back to top Tanju ÖZGÜR Guest Posted: Tue Feb 07, 2006 2:03 pm    Post subject: Re: OpenGL Actually rendering code is nothing but drawing primitive shapes like box, cylinder, etc, where I'm setting the culling is at the initialization routine .Below you can find it : ///////////////////////////// procedure GLInit; const light0_position:TGLArrayf3=( 0.0,0.0,300.0); ambient: TGLArrayf3=( 1.0, 1.0, 1.0); specular :TGLArrayf3 = (0.0,0.0,0.0); sh :GLFloat = 0.4; begin // set viewing projection glMatrixMode(GL_PROJECTION); gluPerspective(80,2,0.1,15000); // position viewer glViewport(0,0,OpenGLForm.Width,OpenGLForm.Height); glMatrixMode(GL_MODELVIEW); glEnable(GL_DEPTH_TEST); glEnable(gl_Lighting); glShadeModel(gl_smooth); glEnable(gl_Cull_face); glCullface(gl_back); glDepthFunc(gl_lequal); glLightfv(GL_LIGHT0, GL_POSITION, @light0_position); glLightfv(GL_LIGHT0, GL_ambient, @ambient); glLightfv(GL_LIGHT0, GL_specular, @specular); glLightfv(gl_light0,gl_shininess,@sh); glEnable (GL_LIGHT0); end; //////////////////// Above if I disable the culling the result is completely a mess. "Gl_Back" value works better than setting "gl_front" "Andrew Jameson" <softspotsoftwareNO (AT) SPAMgmail (DOT) com>, haber iletisinde þunlarý yazdý:43e894c5$1 (AT) newsgroups (DOT) borland.com... Quote: I think that we'd have to see your code to have a chance of helping further - just need the rendering code, although even though you're not culling faces, I can't see why that would generate jaggies. Anti-aliasing comes in many guises and it doesn't necessarily simply 'blur' edges. If you're new to the world of OpenGL, I listed a load of good OpenGL sites in a previous thread but top of my list is : http://www.sulaco.co.za/ You'll find lots of excellent examples by the late Jan Horn ... Andrew Back to top Andrew Jameson Guest Posted: Tue Feb 07, 2006 3:01 pm    Post subject: Re: OpenGL Nothing too startling here ... actually need the rendering loop and not the init ... you are correct using GL_BACK for culling and I'd suggest removing the glDepthFunc line ... I'd really suggest that you start from one of Jan Horns simple examples and he produced a good base template for Delphi : http://www.sulaco.co.za/opengl5.htm and you might like to take a look at NeHe's tutorials ... many of which are downloadable as Delphi projects : http://nehe.gamedev.net/ Tutorial 5 would be a good start and then you could compare whether the 'jaggies' are still visible on those examples. Andrew Back to top Tanju ÖZGÜR Guest Posted: Tue Feb 07, 2006 4:02 pm    Post subject: Re: OpenGL okay here is the acctual code which I call to draw object after GLInit(); and just before SwapBuffers(....) but I couldn't succed to understand what does it help for as long as it's simple. ///////////////// procedure TOpenGLForm.DrawColumn(ColObj: TObject2D); function getNormal(p1,p2,p3:TGLArrayf3):TGLArrayf3; var a,b:TGLArrayf3; begin //make two vectors a[0]:=p2[0]-p1[0]; a[1]:=p2[1]-p1[1]; a[2]:=p2[2]-p1[2]; b[0]:=p3[0]-p1[0]; b[1]:=p3[1]-p1[1]; b[2]:=p3[2]-p1[2]; //calculate cross-product Result[0]:=a[1]*b[2]-a[2]*b[1]; Result[1]:=a[2]*b[0]-a[0]*b[2]; Result[2]:=a[0]*b[1]-a[1]*b[0]; end; var a1,a2,a3,a4,a5,a6,a7,a8 :TGLArrayf3; TmpWidth,TmpHeight :Single; n1,n2,n3,n4,n5,n6,n7,n8 :TGlArrayf3; mat :TGLArrayf3; begin TmpWidth := ColObj.SEP.Width; TmpHeight :=ColObj.SEP.Height; mat[0] := 0; mat[1] := 0.6; mat[2] := 0.4; a1[0] := ColObj.Points[0].X; a1[1] :=ColObj.Points[0].Y; a1[2] := ColObj.SEP.PointI.Z; a2[0] := ColObj.Points[0].X+TmpWidth; a2[1] :=ColObj.Points[0].Y; a2[2] := ColObj.SEP.PointI.Z; a3[0] := ColObj.Points[1].X; a3[1] := ColObj.Points[1].Y; a3[2] := ColObj.SEP.PointI.Z; a4[0] := ColObj.Points[0].X; a4[1] := ColObj.Points[1].Y; a4[2] := ColObj.SEP.PointI.Z; a5[0] := ColObj.Points[0].X; a5[1] :=ColObj.Points[0].Y; a5[2] := ColObj.SEP.PointJ.Z; a6[0] := ColObj.Points[0].X+TmpWidth; a6[1] :=ColObj.Points[0].Y; a6[2] := ColObj.SEP.Pointj.Z; a7[0] := ColObj.Points[1].X; a7[1] := ColObj.Points[1].Y; a7[2] := ColObj.SEP.PointJ.Z; a8[0] := ColObj.Points[0].X; a8[1] := ColObj.Points[1].Y; a8[2] := ColObj.SEP.PointJ.Z; n1 := GetNormal(a1,a2,a3); n2 := GetNormal(a5,a6,a7); n3 := GetNormal(a1,a5,a; n4 := GetNormal(a1,a2,a6); n5 := GetNormal(a4,a8,a7); n6 := GetNormal(a2,a3,a7); GlEnable(gl_Normalize); glMaterialfv(gl_front,gl_ambient,@mat); glBegin(gl_Quads); glNormal3fv(@n1); glvertex3fv(@a1); glvertex3fv(@a2); glvertex3fv(@a3);glvertex3fv(@a4); glNormal3fv(@n2); glvertex3fv(@a5); glvertex3fv(@a6); glvertex3fv(@a7);glvertex3fv(@a; glNormal3fv(@n3); glvertex3fv(@a1); glvertex3fv(@a5); glvertex3fv(@a;glvertex3fv(@a4); glnormal3fv(@n4); glvertex3fv(@a1); glvertex3fv(@a2); glvertex3fv(@a6);glvertex3fv(@a5); glNormal3fv(@n5); glvertex3fv(@a4); glvertex3fv(@a; glvertex3fv(@a7);glvertex3fv(@a3); glNormal3fv(@n6); glvertex3fv(@a2); glvertex3fv(@a3); glvertex3fv(@a7);glvertex3fv(@a6); glEnd; end; "Andrew Jameson" <softspotsoftwareNO (AT) SPAMgmail (DOT) com>, haber iletisinde þunlarý yazdý:43e8b258 (AT) newsgroups (DOT) borland.com... Quote: Nothing too startling here ... actually need the rendering loop and not the init ... you are correct using GL_BACK for culling and I'd suggest removing the glDepthFunc line ... I'd really suggest that you start from one of Jan Horns simple examples and he produced a good base template for Delphi : http://www.sulaco.co.za/opengl5.htm and you might like to take a look at NeHe's tutorials ... many of which are downloadable as Delphi projects : http://nehe.gamedev.net/ Tutorial 5 would be a good start and then you could compare whether the 'jaggies' are still visible on those examples. Andrew Back to top Andrew Jameson Guest Posted: Tue Feb 07, 2006 7:01 pm    Post subject: Re: OpenGL Hi, I'm a bit pushed for time ... so I am simply reiterating my suggestion ... download a few tutorial demos ... you'll acquire a faster understanding than continuing to try to get this example to work ! Andrew Back to top Igor Raskin Guest Posted: Tue Feb 07, 2006 8:02 pm    Post subject: Re: OpenGL "Tanju ÖZGÜR" <tanjuozgur (AT) yahoo (DOT) com> wrote in message news:43e86209$1 (AT) newsgroups (DOT) borland.com... Quote: Hi folk ! 1.) In OpenGL, what can I do to fix the problem at the attached file, edges rendering doesn't satisfy me and also when I'm rotating objects (or translating) edges seem very ragged. What are the coordinate ranges of the quads that you are drawing? What you describe looks like the z-buffering not able to correctly determine the visiblity of shapes fragments. This happens when the competing quads are are located near the far end of the world (15000). Quote: gluPerspective(80,2,0.1,15000); Igor Back to top Tanju ÖZGÜR Guest Posted: Wed Feb 08, 2006 7:01 am    Post subject: Re: OpenGL Quote: What are the coordinate ranges of the quads that you are drawing? The coordinates of objects didn't exceed the max range, they are ranging from 100 to 5000. But anyway your idea has given me the entry point, I know that it wasn't a rocket science, not far range but setting the near range value from 0.1 to 1 gives me the satisfying results, value 2 give much and much better solution, Thank you all , "Igor Raskin" <igorr (AT) web_lakes (DOT) com>, haber iletisinde þunlarý yazdý:43e8f7cd$1 (AT) newsgroups (DOT) borland.com... Quote: "Tanju ÖZGÜR" <tanjuozgur (AT) yahoo (DOT) com> wrote in message news:43e86209$1 (AT) newsgroups (DOT) borland.com... Hi folk ! 1.) In OpenGL, what can I do to fix the problem at the attached file, edges rendering doesn't satisfy me and also when I'm rotating objects (or translating) edges seem very ragged. What are the coordinate ranges of the quads that you are drawing? What you describe looks like the z-buffering not able to correctly determine the visiblity of shapes fragments. This happens when the competing quads are are located near the far end of the world (15000). gluPerspective(80,2,0.1,15000); Igor Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi Graphics All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.