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Which ROS distro are you using?
On Hydro and later, this works for me:
import rospy
from gazebo_msgs.msg import ModelState
On Fuerte, you need to import roslib
, like this:
import rospy
import roslib
roslib.load_manifest('my_pkg')
from gazebo_msgs.msg import ModelState
And before you do that, you have to make sure that in my_pkg/manifest.xml
, you have the line:
<depend package="gazebo_msgs"/>
Of course, in any distro you also need to have gazebo_msgs
installed and on your ROS_PACKAGE_PATH
; you can check by running roscd gazebo_msgs
.