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# Polygons

A polygon is the simplest element of an object and is defined by three vertexes and a face color. The face colour has the values for red, green, blue and alpha (the level of transparency). Polygons must belong to a Polygon Group and they can either be added to your model individually or using tools such as the Geometry Window.
To change the position of a polygon at least one of the vertexes must be selected. To change the color of a polygon the face must be selected and then the color is changed using the Polygon Properties window.
Object Browser
Adding a single polygon
Polygon Groups