Code:

---

function clip_entitys(dist)
{
	while(1)
	{
		you=ent_next(null);
		while(you!=null)
		{
			if(vec_dist(camera.x,you.x)>dist)
			{
				you.invisible=on;
			}
			else
			{
				you.invisible=off;
			}
			you=ent_next(you);
		}
		
		sleep(40);
	}
}

---

clip_entitys(2000);