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<h3>
<a NAME="2d_3dpolygon"></a>Editing a 2d/3d polygon</h3>

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<td><img SRC="2dpoly.gif" ></td>
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Vec : <b>Vector mode</b><br>
Spl : <b>Spline mode</b><br>
This two buttons define the polygon mode. In <b>Vec</b> mode, a straight 
line joins two concecutive points. In <b>Spl</b> mode, the polygon is 
interpolated to be smooth. The number of step added between two 
consecutive points is a quater of the spline resolution.The following 
pictures show the difference between the two modes.<br>
vector mode : <img SRC="vectmd.gif" align="middle"> 
spline mode : <img SRC="splinemd.gif" align="middle"><p>
<img SRC="i_add_pt.gif" > : <b>Add a point</b>.<br>
Adds a point to the nearest part of the polygon each time the user click.<p>
<img SRC="i_del_pt.gif" > : <B>Delete a point</b>.<br>
Deletes a the point each time the user click.<p>
<img SRC="i_square.gif" > : <b>Square</b>.<br>
Sets the polygon to a square, center at the origin.<br>
the result is : <img SRC="vectmd.gif" align="middle"> <p>
<img SRC="i_n_poly.gif" > : <b>Regular polygon</b>.<br>
Defines a regular polygon. The numer of points and the radius is asked.
Each points rely on the circle with the world origin as center.<p>
The result of a 6 points regular polygon, with a radius of 10 is :
<img SRC="polyreg.gif" align="middle"><p>
<img SRC="i_ok.gif" > : <b>Ok</b>.<br>
Proceed.<p>
<img SRC="i_cancel.gif" > : <b>Cancel</b>.<br>
Cancels the current operation.<p>
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