Hi Bryan, take a look into osgPPU. It does exactly what you are looking for.
Cheers, art --- Thrall, Bryan <[EMAIL PROTECTED]> schrieb am Mi, 17.9.2008: > Von: Thrall, Bryan <[EMAIL PROTECTED]> > Betreff: [osg-users] Multi-pass rendering in OSG > An: "OpenSceneGraph Users" <[email protected]> > Datum: Mittwoch, 17. September 2008, 16:38 > I'm attempting to implement a multiple pass rendering > algorithm in OSG, > but I'm not sure what the best way is. I am just > learning how to do this > and how to use Frame Buffer Objects. I initially tried to > implement an > osgFX::Effect, since it supports multiple passes > transparently. The > problem is how to pass the data between the passes. > > The algorithm is to render the model to a texture, then > process that > texture over 3 passes and composite it back into the scene. > I used the > osgprerender example to do the first part using > osg::Camera::FRAME_BUFFER_OBJECT without problems. I then > tried to use > osg::FrameBufferObject to pass the data from the first > processing pass > to the second, but it doesn't work. It looks, from > osgUtil::RenderStage's Camera support, like > osg::FrameBufferObject can't > be used simply by adding it to a StateSet, but it needs > glCheckFrameBufferStatusEXT after the apply(). Is this a > limitation of > osg::FrameBufferObject, or am I missing something? > > My current attempt is to use nested osg::Cameras with > osg::Camera::POST_RENDER for each pass, like so (hoping the > ASCII art > turns out...): > > Root > |->Camera(PRE_RENDER) > ||->Model > |->Camera(POST_RENDER) > ||->Pass 1 quad > ||->Camera(POST_RENDER) > |||->Pass 2 quad > |||->Camera(POST_RENDER) > ||||->Pass 3 quad > ||||->Camera(POST_RENDER) > |||||->Final pass quad > > At each pass, the texture target from the Camera's FBO > is used to > texture the quad for the next pass (with shaders attached > to the next > pass's StateSet to do the processing). > > Is this a recommended approach? Are there any requirements > on the > Cameras (Transform values, ABSOLUTE_RF, etc.) I should be > configuring? > > Thanks, > -- > Bryan Thrall > FlightSafety International > [EMAIL PROTECTED] > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org __________________________________________________ Do You Yahoo!? Sie sind Spam leid? Yahoo! Mail verfügt über einen herausragenden Schutz gegen Massenmails. http://mail.yahoo.com _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
