Polygon angles

[tsgk]

Hello,

I was wondering if there is a way of creating on-the-fly polygons with some of the angles greater than 180 degrees. The description of viz.POLYGON is: "Creates a polygon. Each vertex provides a point for the polygon. Each of the inside angles created by linking the vertices must be acute."

Surely there must be a way of creating concave on-the-fly objects!

Thanks in advance,

G