<sect1 id="sect-gui-views">
    
  <para>
    Opengl views able the user to visualize objects in scene and transform them interactively. There are four views that can be set independently. Mouse interaction is defined by the cursor mode set from the toolbar or object specific parameter.
  </para>
  
 
 <title>Opengl view</title>
  
     <figure id="fig-interface-view">
        <title>An OpenGL View.</title>
        <screenshot>
          <mediaobject>
            <imageobject>
              <imagedata fileref="figures/interface_glviews.png" format="PNG" />
            </imageobject>
            <textobject>
              <phrase></phrase>
            </textobject>
           </mediaobject>
        </screenshot>
      </figure>

<para>
<guilabel>There are three buttons on the view bar :</guilabel>
  <itemizedlist>
  
  <listitem>
      <para>
	<guilabel>The "Menu" button</guilabel>
      </para>
      <para>
        On the left side. Raise the view menu. A right click on the view alsa raise the menu.
      </para>
    </listitem>

  <listitem>
      <para>
	<guilabel>The "Roll" button</guilabel>
      </para>
      <para>
        Roll the view (+) or unroll it (-).
      </para>
    </listitem>
 
  <listitem>
      <para>
	<guilabel>The "Maximize/Restore" button</guilabel>
      </para>
      <para>
        Maximize the view or restore the four views interface.
      </para>
    </listitem>

  </itemizedlist>
</para>

<para>
<guilabel>The view menu :</guilabel>
  <itemizedlist>
  
  <listitem>
      <para>
	<guilabel>The "Refresh" menu entry - ( Accel: E )</guilabel>
      </para>
      <para>
        Force the refresh of view. ( should be useless )
      </para>
    </listitem>

  <listitem>
      <para>
	<guilabel>The "Home" menu entry</guilabel>
      </para>
      <para>
        Restore the default center of view : (0,0,0).
      </para>
    </listitem>
 
  <listitem>
      <para>
	<guilabel>The view modes :</guilabel>
      </para>
 	 <itemizedlist>
 		 <listitem>
 		     <para>
			<guilabel>The "Top" mode - ( Accel: 7 )</guilabel>
 		     </para>
  		    <para>
 		       2d view. Show the scene from the top.
 		     </para>
		    </listitem>
 		 <listitem>
 		     <para>
			<guilabel>The "Front" mode - ( Accel: 1 )</guilabel>
 		     </para>
  		    <para>
 		       2d view. Show the scene from the front.
 		     </para>
		    </listitem>
 		 <listitem>
 		     <para>
			<guilabel>The "Right" mode - ( Accel: 3 )</guilabel>
 		     </para>
  		    <para>
 		       2d view. Show the scene from the right.
 		     </para>
		    </listitem>
 		 <listitem>
 		     <para>
			<guilabel>The "Perspective" mode - ( Accel: 5 )</guilabel>
 		     </para>
  		    <para>
 		       3d view. Show the scene in 3d.
 		     </para>
		    </listitem>
		 <listitem>
 		     <para>
			<guilabel>The "Camera" mode - ( Accel: 2 )</guilabel>
 		     </para>
  		    <para>
 		       3d view. Show the scene as seen from the camera. This does not support povray camera modes and perturbations.
 		     </para>
		    </listitem>

	 </itemizedlist>
    </listitem>
 
    <listitem>
      <para>
	<guilabel>The OpenGL options :</guilabel>
      </para>
 	 <itemizedlist>
 		 <listitem>
 		     <para>
			<guilabel>The "Solid" mode - ( Accel: Z )</guilabel>
 		     </para>
  		    <para>
 		       toggle wireframe/sold representation mode.
 		     </para>
		    </listitem>
 		 <listitem>
 		     <para>
			<guilabel>The "Lighting" mode - ( Accel: L )</guilabel>
 		     </para>
  		    <para>
 		       Toggle lighting on/off.
 		     </para>
		    </listitem>
 		 <listitem>
 		     <para>
			<guilabel>The "Smooth shading" mode - ( Accel: O )</guilabel>
 		     </para>
  		    <para>
 		       toggle antialiasing on/off.
 		     </para>
		    </listitem>

	 </itemizedlist>
    </listitem>

   <listitem>
      <para>
	<guilabel>The view helpers :</guilabel>
      </para>
 	 <itemizedlist>
 		 <listitem>
 		     <para>
			<guilabel>The "Show axis" menu entry - ( Accel: A )</guilabel>
 		     </para>
  		    <para>
 		       toggle 3d axis representation on/off. Axis color can be set in Preferences.
 		     </para>
		    </listitem>
 		 <listitem>
 		     <para>
			<guilabel>The "Show labels" menu entry - ( Accel: B )</guilabel>
 		     </para>
  		    <para>
 		       Toggle 3d axis labels on/off. Labels color can be set in Preferences.
 		     </para>
		    </listitem>
 		 <listitem>
 		     <para>
			<guilabel>The "Show grids" menu entry - ( Accel: G )</guilabel>
 		     </para>
  		    <para>
 		       toggle grids representations on/off. Grids color can be set in Preferences.
 		     </para>
		    </listitem>

	 </itemizedlist>
    </listitem>


  </itemizedlist>
</para>
</sect1>



  <!-- end of button bar docs -->
 
