public static Vector3 GetRandomInUnitSphere()
{
Vector3 pv;
do
{
pv = (2.0f * new Vector3(RandomService.Nextfloat(), RandomService.Nextfloat(), RandomService.Nextfloat())) -
Vector3.One;
}while (pv.LengthSquared() >= 1.0f);
return(pv);
}