Normal spheres in sketchup are made of Trapeziums. they are four sided shapes, which converge into triangles in the top.
while they may make a relatively accurate surface of an real sphere, this is not a good case because if i were to apply textures on it, the small trigangles at the poles of a sphere do not show these textures very well.
compared to a geodesic sphere which has very uniform triangular areas, they show textures much more accurately and uniformly.
the plug in for Geodesic dome can be found in here.
http://phrogz.net/rubylibs/rdoc/classes/Sketchup/Geodesic.html
