p>Map the specified window coordinates (win.x, win.y, win.z) into object coordinates. </p>
<p>The near and far clip planes correspond to z normalized device coordinates of -1 and +1 respectively. (OpenGL clip volume definition)</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">win</td><td>Specify the window coordinates to be mapped. </td></tr>
    <tr><td class="paramname">model</td><td>Specifies the modelview matrix </td></tr>
    <tr><td class="par