// 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>
}