polygon
// arbitrary X,Y FINITE (no CSG) shape
// A complex example for a polygon is the letter P:
polygon {
12, // number of points
<0, 0>, <0, 6>, <4, 6>, <4, 3>, <1, 3>, <1, 0>, <0, 0>, // list of <u,v> points
<1, 4>, <1, 5>, <3, 5>, <3, 4>, <1, 4>
}