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I am a student and would like to learn more about CGAL, but I'm having
difficulties. 
according to the example:  demo/Convex_hull_3/incremental_hull_3_demo.cpp 

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
int main ()
{
  Convex_hull_3 CH(3);  // create instance of the class with dimension == 3

  // generate 250 points randomly on a sphere of radius 100
  // and insert them into the convex hull
  CGAL::Random_points_in_sphere_3<Point_3, Creator> gen(100);

  for (int i = 0; i < 250 ; i++, ++gen)
     CH.insert(*gen);
  assert(CH.is_valid());
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

  Point_3 p(int x,int y,int z);
  CGAL::Random_points_in_sphere_3<p, Creator> gen(100);

the above statement is wrong, how to implement????


I would like to generate points for two balls, but he always puts the points 
in
origin. So d would include the items in the coordinates (x, Y, Z) that I set. 

how make? 

thaks!
Leandro