Why not just use osg::CameraNode as per the osgprerender example? It has a block where it attaches an osg::Image to the RTT camera and use this result processing the image and rewriting it to the main scene graph. Lots of examples using CameraNode for RTT use FBO's with the result being applied as textures in later drawing code. For the later drawing code the main camera's view and projection matrix apply, or you can set you own view matrix using an absolute transform, or even use CameraNode set to NESTED render order to override both the view and projection matrices.
Robert.
Hi All,
I am developing an OSG application that renders a scene, captures the framebuffer, analyses the contents and then renders some additional geometry based on the results of analysis.
I can render and capture the scene but I am having problems creating a second rendering pass to draw the analysis geometry. Currently I am using an osg::Geometry object which I render explictitly using the osg::Drawable::draw() method. It looks as if the geometry is being draw with an incorrect view or projection matrix.
Rather than just get the view and projection matrix from the osgUtil::SceneView and use OpenGL calls to set the matracies, is there a more OSG friendly way to achieve what I want?
The psuedo code looks like this:
// Initialisation
m_SceneView = new osgUtil::SceneView ;
m_SceneView -> setDefaults() ;
// Render loop
m_SceneView -> setFrameStamp( frameStamp ) ;
m_SceneView -> setViewMatrix( m_KBMCallback -> getViewMatrix() );
m_SceneView -> update();
m_SceneView -> cull();
m_SceneView -> draw();
glReadPixels(0, 0, outScreenSize[0], outScreenSize[1], GL_RGBA, GL_UNSIGNED_BYTE, testImageBuffer );
processBuffer( testImageBuffer ) ;
(osg::Geometry *)symbology -> draw( *m_SceneView -> getState() ) ;
m_RenderSurface -> swapBuffers();
Regards,
Andy
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