function camera_follow(ENTITY* ent)
{
	while(1) 
	{
		vec_set(camera.x,vector(-200,-35,45));  //camera position relative to the player     
		vec_rotate(camera.x,ent.pan); // rotate the camera position with the player
		vec_add(camera.x,ent.x);      // add player position
		vec_set(camera.pan,vector(ent.pan,-5,0)); // look in player direction, slighty down      


		wait(1);
	}
}

function camera_follow(ENTITY* ent)
{
	var camera_distance, camera_distance_max;
	VECTOR camera_target;
	
	camera_distance_max = vec_length(vector(-200,-35,45));
	camera_distance = camera_distance_max;
	while(1) 
	{
		// calculate camera target
		vec_set(camera_target.x,vector(-200,-35,45));  //camera position relative to the player     
		vec_rotate(camera_target.x,ent.pan); // rotate the camera position with the player
		vec_add(camera_target.x,ent.x);      // add player position
		camera_distance += (camera_distance_max-camera_distance)*0.2*time_step; // for a smoother wall alignment
		
		// check for walls
		
		set(ent,PASSABLE);
		result = c_trace(ent.x,camera_target,IGNORE_PASSABLE);
		reset(ent,PASSABLE);
		if(trace_hit) camera_distance = minv(camera_distance,result);
		
		// set camera position
		
		vec_lerp(camera.x,ent.x,camera_target.x,camera_distance/camera_distance_max);
		vec_set(camera.pan,vector(ent.pan,-5,0)); // look in player direction, slighty down      

		wait(1);
	}
}

ENTITY *entCameraCollider;
function camera_collider_startup ()
{
   entCameraCollider = ent_create(CUBE_MDL,vector(0,0,-100000),NULL);
   vec_fill(entCameraCollider.max_x, 16);
   vec_fill(entCameraCollider.min_x, -16);
   set ( entCameraCollider, INVISIBLE ); 
}

function camera_follow(ENTITY* ent)
{
   ...
   // check for walls

   set(ent,PASSABLE);
   ENTITY *entMeOld = me;
   me = entCameraCollider; 
   result = c_trace( ent.x, camera_target, IGNORE_PASSABLE | USE_BOX );
   reset(ent,PASSABLE);
   me = entMeOld;
   if(trace_hit) camera_distance = minv(camera_distance,result);
		
   ...
}