         <em class="parameter">
                  <code>f</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the mapping of the far clipping plane to window coordinates.
                    The initial value is 1.
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1" id="description">
        <h2>Description</h2>
        <p>
            After clipping and division by <s