float PI = 3.14159265;
float TWOPI = 6.28318531;
float baseRadius = 1.0;

vec3 sphere( float u, float v) {
	u *= PI;
	v *= TWOPI;
	vec3 pSphere;
	pSphere.x = baseRadius * cos( v ) * sin( u );
	pSphere.y = baseRadius * sin( v ) * sin( u );
	pSphere.z = baseRadius * cos( u );
	return pSphere;
}