Meshing of a curved Nurb surface

Gentlemen,

I would like to find a simple and robust algorithm for meshing a four
sided mesh surface. The mesh could be triangular but ideally quad with
triangles only where needed. The mesh is for a finite element program
which means that the elements should have decent aspect ratio and
angles.

I'm looking a Delaunay triangulation, but doing it in real world
coordinates seems messy when a surface is curved (and I need to search
in spheres, not circles). Doing it in the nurb internal coordinates
will probably generate some bad aspect ratios on the elements if the
surface has a small curvature or some short edges.

As usual, there must be a "best practice" on this. A workhorse
algorithm.
Any feedback & link appreciated

/Jonas Forssell, Sweden
.

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