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Editing a 2d/3d polygon

Vec : Vector mode
Spl : Spline mode
This two buttons define the polygon mode. In Vec mode, a straight line joins two concecutive points. In Spl 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.
vector mode : spline mode :

: Add a point.
Adds a point to the nearest part of the polygon each time the user click.

: Delete a point.
Deletes a the point each time the user click.

: Square.
Sets the polygon to a square, center at the origin.
the result is :

: Regular polygon.
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.

The result of a 6 points regular polygon, with a radius of 10 is :

: Load a polygon (*.p2d / *.p3d).
Loads a polygon.

: Save a polygon (*.p2d / *.p3d.
Saves the current polygon.

: Ok.
Proceed.

: Cancel.
Cancels the current operation.


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