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Depth buffer value calculation..!

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Hi all, As some of you are probably aware of the depth buffer isn''t mapped linearly. So, I''m currently doing a project where I need to write the depth buffer values myself and I tried using the equation derived in this document: The main problem with the above document''s equation is basically that it''s VERY unprecise. The smaller the distance between the near and far clip plane, the more unprecise the calculated result gets! So, what I''m basically looking for here is a link, some help or just something that could point me in the direction of calculating a much more precise value! Even a slight difference on the third decimal is enough to make the depth comparison go crazy! Please.. somebody enlighten me :D

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