no image received in rviz (turtlebot sim)

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This is specific to Turtlebot3. The 'burger' model doesn't have a camera whereas the 'waffle_pi' does. I had to reset the model to waffle_pi to get all the camera related topics.

It might be that the rviz config is connected to the wrong topic. See if there's another topic available to select for the image.

tfoote, thanks for your answer. I had the same problem and used your advice.

1. Firstly, I'd like to add more detailed answer.

   Edit the parameter "Image"->"Image Topic" to possible value (for example, "/camera/rgb/image_raw"). You can find possible values click on the drop-down list on the "Image"->"Image Topic". It works only for this session.

   If you want to make changes to all sessions, edit this parameter in the config: robot.rviz. You can find the path in File->Open Config. In robot.rviz find "Class: rviz/Image" and edit "Image Topic".

2. Secondly, I'd like to add other decision. You can use current Topic (at least "/camera/rgb/image_rect_color"). Install "openni" and launch it:

   1. sudo apt-get install ros-indigo-openni-launch
   2. In a new terminal execute: roslaunch openni_launch openni.launch load_driver:=false depth_registration:=true