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OpenGL Get points from pixels

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I have a mesh file of a 3D model with n points and m triangles.
I rendered this model using openGL and saved it as an image.

How can I make the correspondance between each pixel and
point? I know openGL has gluUnProject function that converts
window coord to obj coord. But if I have more points than pixels,
how do I understand the correspondance?

Thanks in advance.

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