Many thanks for your answer Per Rosengren,
I tried it and it works fine. Sorry, but I forgot to use
the Look at function.
Many thanks
Best Regards
Arnaud
> You have to set both the view matrix and the projection matrix of the
> camera.
>
> The view matrix is the pose of the scene coordinate system in the camera
> cordinate system.
> Use
>
> void setViewMatrixAsLookAt (const osg::Vec3 &eye, const osg::Vec3
> ¢er, const osg::Vec3 &up)
>
> and provide it with the position for the camera (eye) and your HUD
> object (center), and the vector that points in the up direction of the
> HUD (up), all un the scene coordinate system.
>
> The projection matrix sets the projection from 3d to 2d. Use
>
> void setProjectionMatrixAsPerspective (double fovy, double aspectRatio,
> double zNear, double zFar)
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