See the glsl_quickref.pdf there are several OSG-specific "built-in uniforms" such as osg_ViewMatrix. Also see glsl_simple.osg for example of a single shader parameterized with different uniforms.
-- mew > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:osg-users- > [EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] > revolution.org > Sent: Tuesday, April 08, 2008 3:55 AM > To: [email protected] > Subject: [osg-users] Dilemma with the usage of object Shaders in > differendviews ... > > Hi folks, > > actually i am working on object shading with OSG (i.e. Dot3). All works > fine > with single views. Now i am using the osgViewer::Composite viewer and > getting > some dielemma with the usage of object based shaders in differend views > based > on the same scene graph. > > I.e.: I've a single scene node with an object X where i bind the > shaders (at > the object StateSet) for execution. In a single view no problem. If i > use this scene in > multiple views (i.e. A, B) i've the dilemma, that i've to use diffrend > shader params > on the same shader instance. In each rendering pass the params of the > camera > are differend from the point of view of the views, if the views are > rendered. But > the shader has no knowledge about this, it uses only a single uniform > to hook bind > param ... > > I've thought about the following sollutions: > > 1. Using for each view a single shader instance at the same object > StateSet. > Is this usefull? If the scene is complex i could get a huge count of > shaders > which have to be executed. Additionally i'm not sure, if the binding of > the "unused" > shaders produces render artifacts or perfomance issues... > > 2. Using a callback mechanism which switches this values at the shader > before > rendering > > How i could achieve this aim in best way? Has anyone a better solution? > > Best regards, > Christian > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users- > openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
