def lookAt(pos: Vector3): Unit = {
  val camPos = Vector3(cam.getPositionVector)
  val diff = camPos - pos
  val yaw =  math.toDegrees(math.atan(diff.x / diff.z)).toFloat
  val pitch = math.toDegrees(math.atan(diff.y / diff.z)).toFloat

  cam.rotationYaw = yaw
  cam.prevRotationYaw = yaw
  cam.rotationPitch = pitch
  cam.prevRotationPitch = pitch
}