Hi, if you want to have it to be extendable to n-passes, then you have to go the way you have proposed first. Create n camera's located on the same position. The subgraph scene of the camera should have your projective shader applied, so that if it get rendered then you have projected the correct texture on the scene.
Afterwards you have to combine them. The easiest way would be to use the osgPPU library (use the current svn version) where you can specify a shader which do combines all the camera views into one texture. Of course this is still not a general solution, because you need to know how much cameras you have when you write your shader. Maybe the other solution would be to attach the same output texture to every camera's frame buffer object and use a shader and an adding-blend operation to write only the 1/n of the color value to that texture . After all camera passes you will get the average value out of it. Cheers, Art ----- Ursprüngliche Mail ---- Von: Jason Ziglar <[EMAIL PROTECTED]> An: OpenSceneGraph Users <osg-users@lists.openscenegraph.org> Gesendet: Montag, den 5. Mai 2008, 22:42:09 Uhr Betreff: Re: [osg-users] Multiple projective texture passes? I don't see any straightforward way to ensure that is is extensible to n-passes using that technique though. My understanding is that I can't have an array of matrices in the shader, so in order to add a single pass I'd have to go and recompile the entire program. Is there a technique for having multiple transformation matrices without hard-coding the list of matrices? Thanks in advance, Art Tevs wrote: > Hi Jason, > > I think, you do not need multiple cameras. If you have > the projective matricies of each of the captured > viewcamera, then you can just combine all the > projective textures in one pass. Just pass all your > matricies and corresponding textures to the shader and > compute the average value. > > If you was able to setup the environment for the one > projective textures, then extending it to multiple > textures is not a big issue. > > Cheers, > Art > > > --- Jason Ziglar <[EMAIL PROTECTED]> schrieb: > > >> Hi all, >> I'm trying to write a program which takes >> multiple images and >> projectively textures a scene with them. The images >> are taken at >> different locations within the scene, and I'd like >> to have the scene >> rendered with the result from projecting all the >> images onto the world >> geometry. >> >> I've got a shader and code base which can >> project a single image >> onto geometry, but I'm not entirely certain how to >> extend this to >> multiple images. Multiple cameras seems like the >> right idea, except that >> I don't see how to grab the correct transforms and >> textures for a given >> camera and apply them to the scene in order. Any >> suggestions? >> >> >> _______________________________________________ >> osg-users mailing list >> osg-users@lists.openscenegraph.org >> >> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > Machen Sie Yahoo! zu Ihrer Startseite. Los geht's: > http://de.yahoo.com/set > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org E-Mails jetzt auf Ihrem Handy. www.yahoo.de/go _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
