Hi Carsten, just to get this correct. Is depth peeling not implemented in openSG1.8 only or is it missing in both 1.8 and 2.0?
regards, Michael -------- Original-Nachricht -------- > Datum: Mon, 16 Nov 2009 09:56:21 -0600 > Von: Carsten Neumann <[email protected]> > An: [email protected] > Betreff: Re: [Opensg-users] OpenSG1.8 - Sorting Problems > Hello Michael, > > Michael Raab wrote: > > we're using OpenSG1.8 in our VR application. > > We have some problems rendering (semi-)transparent objects. The correct > rendering of these objects depends on the viewing position. So my guess is > that there might be something wrong with sorting of objects during > rendering. > > > > - Is that a known problem? If yes, are there things that we can do to > avoid this? > > to render transparent objects correctly the individual polygons have to > be rendered in a defined order (back to front, or the other way around). > In other words one needs to do depth peeling to get this right, but > that is not implemented in OpenSG at the moment. > Instead OpenSG sorts transparent objects from back to front based on the > distance of the center of the bounding box to the camera. This only > approximates the correct ordering of polygons and limitations when it > comes to large or intersecting objects [1]. > It generally helps to keep transparent objects small (maybe even by > splitting larger objects) and far apart from each other, if possible. > What do your scenes typically look like? Are there any assumptions you > can make about the position of transparent objects to each other? > > Cheers, > Carsten > > [1] In general it also gives incorrect results if the objects has a > closed surface (e.g. a surface) and you do not use backface culling. > Backfacing polygons could be rendered after front facing ones and give > incorrect blending results. > > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 > 30-Day > trial. Simplify your report design, integration and deployment - and focus > on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Opensg-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/opensg-users -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01 ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Opensg-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/opensg-users
