[osg-users] Stereo convergence param in OSG?
To the best of my knowledge, to do stereo rendering, you must expose two parameters, which are known by various names, typically: 1. Eye separation, the distance between the two stereo 'eyes'. This is in OSG as osg::DisplaySettings::setEyeSeparation. 2. Convergence, which is like a horizontal offset between the rendered views, or it can be thought of as the distance from the camera at which the two images converge. I cannot find any setting in SceneView or DisplaySettings for this. As the email below agrees, this is a vital parameter for any real stereo use. Perhaps i am just not finding it, is it in OSG somewhere? I did search the list archive, and found no relevant mention of 'convergence'. Thanks, Ben -Original Message- From: Michal Husak [mailto:[EMAIL PROTECTED] Sent: Thursday, March 27, 2008 2:57 AM To: Ben Discoe Hi Ben As far as i can tell, OSG does not expose a factor like convergence (or 'Zero parallax plane position'). I am afraid convergence is related to the use of rotated cameras (toe in). it produce keystone distortion ... ZPP does not use rotated cameras - it use just OpenGL viewport manipulation ... The result is similar for both approaches ... Do you know of anyone using OSG-based software who is doing the kind of stereo needed? Unfortunately i do not ... I cannot imagine anybody uses OSG in stereo without the possibility to adjust the ZPP or at least convergence ... Michal Husak Technical Director GALI-3D, s.r.o. Ceska 32 370 01 Ceske Budejovice Czech Republic mobile phone:+420 776 018 351 mailto:[EMAIL PROTECTED] http://www.gali-3d.com ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Stereo convergence param in OSG?
Hi Ben, On Thu, Jun 26, 2008 at 5:08 PM, Ben Discoe [EMAIL PROTECTED] wrote: As the email below agrees, this is a vital parameter for any real stereo use. Perhaps i am just not finding it, is it in OSG somewhere? I did search the list archive, and found no relevant mention of 'convergence'. You can use the osg::DisplaySettings::setScreenDistance() and osgUtil::SceneView::setFusionDistance() methods to control how objects converge in stereo. For example, if you want objects 10 units from the viewpoint to appear on the monitor surface, you can set the fusion distance to 10. -Farshid ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Stereo convergence param in OSG?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Ben Discoe wrote: As the email below agrees, this is a vital parameter for any real stereo use. Perhaps i am just not finding it, is it in OSG somewhere? I did search the list archive, and found no relevant mention of 'convergence'. That's because OSG doesn't use that. OSG uses asymetric view frusta, which is the *correct* way to do stereo. The rotated cameras/toe-in method that needs convergence setting produces eye strain and distortion. Eye separation can be set using environment variables, also screen size and viewer's distance from it (the location of the zero parallax plane) - - these are all exposed in osg::DisplaySettings. You can find a good primer how to correctly set up stereo here: http://local.wasp.uwa.edu.au/~pbourke/projection/stereorender/index.html Jan -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mandriva - http://enigmail.mozdev.org iD8DBQFIZECPn11XseNj94gRAqu1AKCOrdTUFG/6qbOdd2Vr5qTRIIrLkACgyQlD ZBNbDWnerOcy0HL2SfI3250= =+6pT -END PGP SIGNATURE- ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
