Hi all, the gl_ProjectionMatrix allows me to compute the up and right vector in view coordinates. vec4 right = gl_ProjectionMatrix*vec4(1,0,0); vec4 up = gl_ProjectionMatrix*vec4(0,1,0); I can use those vectors to create a nice quad in the geometry shader.
The problem is when using head tracking (OSGProjectionCameraDecorator). The orientation of the head messes with the gl_ProjectionMatrix, and thus with the shape of my quad. I essentially just need the aspect ratio of the viewport in my shader. Passing it as a variable is not possible (I think?) because I have a cluster environment, multiple viewports, with different aspect ratios... thanks for reading! best regards, Victor
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