[osg-users] Getting the "depth clamped" projection matrix of a CameraNode

[Alan Purvis]

Hi,

On 7 Dec 2007, at 15:58, Robert Osfield wrote:

>
> Looking at your code you are setting a uniform with the projection
> matrix.   Perhaps you can dispense with this completely as OpenGL
> itself has the projection matrix as a built in uniform.

Unfortunately not, the uniform in question is attached to a different  
RTT camera , with a different scene and destination to the one that's  
producing the matrix I want. The matrix in question is being used to  
render a complex 3D scene to an FBO, which the camera using the  
uniform renders using a simple textured quad to another FBO. The  
camera rendering the textured quad naturally has a different  
projection matrix (identity, vs perspective) to the one used to  
render the scene into the first FBO texture. What I need is the  
projection matrix that was used to generate the RTT texture when I'm  
"blitting" it to another destination with a textured quad.

>
> Robert.
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Thanks,
Alan