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carla-simulator / ros-bridge

ROS bridge for CARLA Simulator
MIT License
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Unable to get messages from /carla/ego_vehicle/camera/rgb/front/image_color #147

Closed strider175 closed 5 years ago

strider175 commented 5 years ago

Hello everyone,

I am using CARLA 0.9.5., ROS Kinetic, Ubuntu 16.04, Carla Ros Bridge 0.9.5. for my graduate project in which I am supposed to to control my vehicle by using ROS. My problem is that when i use ros tutorial code for subscribing to rostopic /carla/ego_vehicle/camera/rgb/front/image_color and when I list rostopic info i can see that my node is subscribed to rostopic but my callback function is never called. So i used rostopic hz to check whether messages are sent and i get following output where it seems that subscriber is not sending messages to my node: Screenshot from 2019-07-05 12-36-12

I am really stuck on this step for a while and I hope that someone can help me. Thank You in advance.

fpasch commented 5 years ago

I'm not 100% sure, but rostopic hz might not be working with simulated time (as reported by your rostopic call).

Please first ensure, that you get any data at all. E.g. by rostopic echo /clock. Then check with rviz.

strider175 commented 5 years ago

When I type rostopic echo /clock I get following: Screenshot from 2019-07-05 17-53-44 I tried setting use_sim_time to false but then nothing happens. Also in rviz there are no images received Screenshot from 2019-07-05 17-55-52

fpasch commented 5 years ago

Do you still face the issue?

strider175 commented 5 years ago

Yes, I am still unable to resolve the issue.

GlinZhu commented 5 years ago

I had the exact same issue with you, but I was working on Udacity self-driving car project, haven't worked on carla simulator before. and you are right, the reason is that the subscriber is not sending the images to your node. I fixed the issue by checking the camera toggle button in the simulator, which may not be quite helpful for you, but it may give you some insights..

fpasch commented 5 years ago

If you run 

roslaunch carla_ros_bridge carla_ros_bridge_with_example_ego_vehicle.launch

Do you see an image in the pygame window? If yes, that's received via the camera topic.

strider175 commented 5 years ago

When I run roslaunch carla_ros_bridge carla_ros_bridge_with_example_ego_vehicle.launch I get this window without image: Screenshot from 2019-07-17 12-31-05

fpasch commented 5 years ago

So your issue is not related to camera-data at all. Please precisely follow the documentation on installation and execution.

Please also ensure, that you're using Carla 0.9.6 with current master (or carla 0.9.5 with tagged version 0.9.5.1) If the error remains have a look at the output during execution.

I'll close that issue for now. If you find a more specific error, feel free to create a new issue.