[osg-users] osgPreRender question(s)

J.P. Delport jpdelport at csir.co.za
Tue Nov 3 22:16:11 PST 2009


Wyatt Earp wrote:
> I am going through the osgprerender example to try to understand how
> it works, and I think I am starting to understand a bit more, but i
> have some questions.
> If I instantiate a viewer, as is done in osgprerender...
> osgViewer::Viewer viewer(arguments);
> I assume this has a default camera right?  Before the viewer.run() call, I
> osg::Camera *camera = viewer.getCamera();
> and see that the camera has POST_RENDER render order.  in
> createPreRenderSubGraph, another camera with PRE_RENDER render order
> is added.  Does this mean that the second camera renders the scene
> before the default camera?  Then the second scene renders the scene a
> second time?

the idea is that the prerender camera generates a texture that is used 
by the default (main) camera. The two cameras do not have to render the 
same scene.


> W
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