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some problem using FEEDBACK_MODE

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Hi, I used successfully GL_FEEDBACK one time. By successfully, i mean : the GL_FEEDBACK only returns the triangles THAT ARE DRAWING. But, i had to change the code: i am drawing a face, and the camera was IN the face. So, i have moved the camera OUTSIDE the face, and now, the GL_FEEDBACK doesnt work. The same buffer i am using get ALL the triangles of the face : those which are drawing, and also those which are hidden by some triangles. I really cant understand this change of the behavior of the FEEDBACK MODE. Do you have any idea ? Thanks a lot.

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