How to Turn a Camera Down on Stageros

edit

Hi .. I have the following robot:

define roomba_cam position
(
  size [0.33 0.33 0.1]

  # this block approximates the circular shape of a Roomba
  block( 
    points 16
    point[0] [ 0.225 0.000 ]
    point[1] [ 0.208 0.086 ]
    point[2] [ 0.159 0.159 ]
    point[3] [ 0.086 0.208 ]
    point[4] [ 0.000 0.225 ]
    point[5] [ -0.086 0.208 ]
    point[6] [ -0.159 0.159 ]
    point[7] [ -0.208 0.086 ]
    point[8] [ -0.225 0.000 ]
    point[9] [ -0.208 -0.086 ]
    point[10] [ -0.159 -0.159 ]
    point[11] [ -0.086 -0.208 ]
    point[12] [ -0.000 -0.225 ]
    point[13] [ 0.086 -0.208 ]
    point[14] [ 0.159 -0.159 ]
    point[15] [ 0.208 -0.086 ]
    z [0 0.1]
  )

  localization "gps"
      localization_origin [0 0 0 0]

  color "gray50"

  camera 
  ( 

    origin [0 0 -0.11 0]

    # laser properties 
    resolution [ 1280 720 ] 
    range [ 0.2 9.0 ] 
    fov [ 70.0 40.0 ] 
    pantilt [ 0.0 0.0 ] 

    # model properties 
    size [ 0.1 0.07 0.05 ] 
    color "black" 
    watts 100.0 # TODO find watts for sony pan-tilt camera 
  ) 
)

I put the camera underneath the robot because I want to place it at the top of the simulation and I need the camera to be facing down, but it is facing forward. Can anyone help me how to do it to turn it down?