RE: [osg-users] Multiple rendering stages

Tue, 03 Oct 2006 07:25:26 -0700

Could it be that you need to call setComputeNearFarMode( osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR ) ?
   -Paul
 

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Andy Preece
Sent: Tuesday, October 03, 2006 7:16 AM
To: [email protected]
Subject: [osg-users] Multiple rendering stages

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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