class="parameter"><code>n</code></em> and <em class="parameter"><code>f</code></em>
                        are clamped to the range [0 to 1] when computing window z.
       </p>
        <p>
            The setting of (0,1) maps the near plane to 0 and
            the far plane to 1.
            With this mapping,
            the depth buffer range is fully utilized.
        </p>
      </div>
      <div class="refsect1" id="notes">
        <h2>Notes</h2>
        <p>
            It is not necessary that <em 