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3D symbols for point data: spheres and beachballs

Needing to make small 3D symbols for point data, spheres in particular, I am using code like that in the ucar.visad package, class ShapeUtility.java, which creates VisADGeometryArray-s by specifiy the 
xyz locaiton of every vertex, and a normal for each vertex and face.
See the 3d pyramids in the figure at the bottom of
 http://geon.unavco.org/unavco/IDV_for_GEON.html
The VisADGeometryArray and the ShapeUtility code allows the
needed feature of resizing the shape and setting a color. But making a sphere looks difficult, since it is not a simple 
polygon with flat faces. Has someone a solution?

Looking ahead, I need to color the sphere in panels (gores) like a
beachball for earthquake focal mechanisms. See
http://quake.wr.usgs.gov/recenteqs/beachball.html
Any ideas?

Chiao

Stuart Wier

UNAVCO
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