> Do I get nice curved lines when filling a Geometry with 
> Vertices?

It depends on how many vertices you use to approximate your curve. Use
enough so that the individual line segment lengths approach a pixel width,
and you'll have the illusion of a smooth curve, just like with GLU or OpenGL
evaluators. As you use fewer vertices and longer segments, the illusion
becomes increasingly less convincing (again, just like with GLU or OpenGL
evaluators). It's a sampling problem.

> Does OSG support Bezier curves or something like that?

As Robert said, no. You'll need to implement this yourself by adding the
vertices to approximate your curve.

The bottom line is that GLU isn't doing anything secret under the hood that
you can't do in your own code.
   -Paul

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