code: private Point3d[] generateSpherePoints(int nSpherePoints) {
  		Point3d[] points = new Point3d[nSpherePoints];
  		double inc = Math.PI * (3.0 - Math.sqrt(5.0));
  		double offset = 2.0 / nSpherePoints;
  		for (int k=0;k<nSpherePoints;k++) {
  			double y = k * offset - 1.0 + (offset / 2.0);
  			double r = Math.sqrt(1.0 - y*y);
  			double phi = k * inc;
  			points[k] = new Point3d(Math.cos(phi)*r, y, Math.sin(phi)*r);
  		}
  		return points;
  	}
docs: Returns list of 3d coordinates of points on a sphere using the
  Golden Section Spiral algorithm.
  @param nSpherePoints the number of points to be used in generating the spherical dot-density
  @return