Hello, a important information about the osg example. In the springmasssystem.cpp on line 97 and 98 is a test case implemented. That means, all vertices are pined in this case (the connection data are filled with -1). If you want to compare the opengl and the osg version, you have to comment this part.
Cheers, Martin -------- Original-Nachricht -------- > Datum: Fri, 27 Apr 2012 13:01:39 +0200 > Von: "Martin Großer" <[email protected]> > An: [email protected] > Betreff: [osg-users] transform feedback implementation > Hello, > > today I want to share my experiment with transform feedback. I implemented > an example from the book "OpenGL Superbible, Fifth Edition". In Chapter 11 > there is a spring mass system example. The aim is the calculation of the > physics into the vertex shader. The result should have to transfer with > transform feedback into a second buffer (ping pong) and this buffer have to > rendered. I was a little bit overextended with this in osg, because there was > no support for this. Also I implemented this in OpenGL and after this I do > the same in a osg::Drawable (drawImplementation function) in my osg > example. A positive fact is I see something in my osg example, but it doesn't > do > the same like the opengl example. It looks strange and I don't have any idea > what's wrong. :-( I attached the two examples to this e-mail. > > I someone want to test the examples, I use cmake an I wrote a shell > script, which creates a build and a release directory and execute cmake in the > build directory. The osgDemo and the shader file are moved to the release > directory when you do 'make install'. > > Following a short overview of the examples: > > opengl_transform_feedback.7z > - main.cpp <-- main function > - mycallbacks(.cpp/.h) <-- glut callback functions > - springmasssystem(.cpp/.h) <-- spring mass object (init and draw > function) > - spring_mass.vert <-- vertex shader (spring mass physics) > > > osg_transform_feedback.7z > - main.cpp <-- main function (osgviewer) > - myextensions.h <-- extension class (base class is osg::GL2Extensions) > - springmasssystem(.cpp/.h) <-- drawable class (spring mass system) > - spring_mass.vert > > I hope some osg users are interested in this topic and have some ideas. > > Thanks! > > Martin > -- > NEU: FreePhone 3-fach-Flat mit kostenlosem Smartphone! > > Jetzt informieren: http://mobile.1und1.de/?ac=OM.PW.PW003K20328T7073a -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
