Hello!! I have solved it changing the values of the camera. It was the main problem. At first I had a cam.fov = 0.01, and I supposed that it was a very small range. Then I have put more, and apparently it is solved. I discover it when I was developing a playground to show the code. I don't know how it works, but testing with some combinations of numbers of cam.fov and cam.radius it is solved. Thanks for your time!!