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Using pointgrey camera in simulation environment

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Hello, I am using the jackal from Clearpath robotics. I have installed the required packages and drivers for the pointgrey camera. I wanted to be able to use the camera in simulation environment with gazebo. How do I launch the camera in the simulation environment. I followed the instructions at: http://www.clearpathrobotics.com/assets/guides/ros/ROS%20Navigation%20Basics.html#customization These speak of using the custom urdf file for camera specs. But when I do a roslaunch after that, I get the following error: Xacro conditional "$(optenv JACKAL_URDF_EXTRAS 0)" to: evaluated"/home/bru/dev/SensorFusionAndControl/BasicJackalNavigation/src/jackal/jackal_description/urdf/custom_example.urdf", which is not a boolean expression. when processing file: /home/bru/dev/SensorFusionAndControl/BasicJackalNavigation/src/jackal/jackal_description/urdf/jackal.urdf.xacro while processing /home/bru/dev/SensorFusionAndControl/BasicJackalNavigation/src/jackal/jackal_description/launch/description.launch: Invalid tag: Cannot load command parameter [robot_description]: command [/opt/ros/indigo/lib/jackal_description/env_run /home/bru/dev/SensorFusionAndControl/BasicJackalNavigation/src/jackal/jackal_description/urdf/configs/base /opt/ros/indigo/lib/xacro/xacro /home/bru/dev/SensorFusionAndControl/BasicJackalNavigation/src/jackal/jackal_description/urdf/jackal.urdf.xacro --inorder] returned with code [2]. Param xml is: "param command="$(find jackal_description)/scripts/env_run $(find jackal_description)/urdf/configs/$(arg config) $(find xacro)/xacro $(find jackal_description)/urdf/jackal.urdf.xacro --inorder" name="robot_description" The traceback for the exception was written to the log file What am I not doing here? Please help and advise. Regards, rsmitha.

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