Hi, You are probably best adding OpenGL calls as part of the scene graph, by subclassing from osg::Drawable as per the osgteatpot example. Then just add this custom Drawable to the subgraph below your RTT Camera.
Robert. On Nov 14, 2007 1:55 AM, 易成 <[EMAIL PROTECTED]> wrote: > Hi Everyone, > I want to add some OpenGL draw code into my camera's draw process and render > to a texture for multi render pass. So I first set a GL postdrawcallback to > my main camera to do something such as draw some lines. Then I need to > capture the whole screen to a texture , and use it in my fragment shaders. > So I use the FBO for the texture like osgprerender example, but from the > texture I can't find the GL lines I drawed in my GL postdrawcallback, only > the scene rendered in my camera's draw process. How can I achieve the whole > texture including my GL post-draw effects? Must I use another drawcallback > to Copy the GL_BACK pixel values? > _______________________________________________ > 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
