[osg-users] blending with shader

Gianni Ambrosio g.ambrosio+osg at gmail.com
Fri Sep 30 07:21:50 PDT 2016

Hi All,
I have a projector attached to a PC where a 3rd party application runs. The 3rd party application uses OSG 3.0.1 and allows to add custom code re-implementing some virtual methods of their base Plugin class.

I need to apply a blending operation to the visualized scene so that the projector displays the blended image on the (curved) screen (please see attached image). I guess the source image (=image of the scene just like an osg viewer does) must be warped also but that's story I will investigate on later.

Even if I have just a rough idea of shaders, as far as I have understood that's the way to implement the required blending.

I found several examples in which a shader manipulates the 3D scene but in my case I think I have to modify the resulting image of the scene.
Now, it is not clear to me how pass the required informations to the shader code and if I can handle the whole rendered image of the scene from the shader and how.


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