create a sphere

how do I create a sphere ? with a center point and a Radius ? and do I need a distans between the points so the triangles don´t get to smal and to many ?

gluSphere(Ku, 1, 16, 16);

oder mit Multitexturing
http://astronomy.swin.edu.au/pbourke/opengl/sphere/

not with glu I need the math how to draw a cube