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<H2 >
<table> <tr><td width='400' align='center'>3D Window</td></tr>
</H2>
<table>
<tr><td width="200" align='right'>Drag:	           </td><td width="200">Rotate</td></tr>
<tr><td width="200" align='right'>Ctrl-Drag:       </td><td width="200">Pan</td></tr>
<tr><td width="200" align='right'>Shift-Drag:      </td><td width="200">Zoom</td></tr>
<tr><td width="200" align='right'>Wheel:           </td><td width="200">Zoom	</td></tr>
<tr><td width="200" align='right'>Alt-Drag:        </td><td width="200">Z-Panning</td></tr>
<tr><td width="200" align='right'>Ctrl-Shift-Drag: </td><td width="200">Change light direction</td></tr>
<tr><td width="200" align='right'>Shift-Wheel:     </td><td width="200" align='justify'>Change perspective (up to a orthographic camera)</td></tr>
<tr><td width="200" align='right'>Ctrl-Wheel:      </td><td width="200">Move near clipping plane <br>(in image space: 0 is viewer position, 1 is trackball center)</td></tr>
<tr><td width="200" align='right'>Double Click:    </td><td width="200">Center on mouse</td></tr>
<tr><td width="200" align='right'>Alt+enter:       </td><td width="200">Enter/Exit fullscreen mode</td></tr>
<tr><td width="200" align='right'>Ctrl-H:          </td><td width="200">Reset Trackball (WINDOWS)</td></tr>
<tr><td width="200" align='right'>Command-Shift-H: </td><td width="200">Reset Trackball (MacOS)</td></tr>
</table>
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<H2 >
<table> <tr><td width='400' align='center'>Layer Window</td></tr>
</H2>
<table>
<tr><td width="200" align='right'>Click on eye icon: </td><td width="100">Toggle visibility status of the layer</td></tr>
<tr><td width="200" align='right'>Ctrl-Click on eye icon: </td><td width="100">Make Invisible all other layers</td></tr>
<tr><td width="200" align='right'>Alt-Click on eye icon: </td><td width="100">Make Visible all other layers</td></tr>
<tr><td width="200" align='right'>Shift-Click on eye icon: </td><td width="100">Invert visibility status of all the layers</td></tr>
</table>
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