Hi,
When I run the ```turtlebot_world.launch``` file in ```turtlebot_gazebo```, there are many missing transformations compared to when I run ```minimal.launch``` on a real turtlebot. This is the result I get from ```rosrun tf view_frames```:

I have not been able to figure out why these are the only transforms available. When I run ```minimal.launch``` on a real robot, there are many more, such as transforms for camera_depth and camera_rgb, cliff sensors, etc. Are the transforms shown above the only transforms expected when running ```turtlebot_world.launch```?
When I look at the ```/robot_description``` param after running ```turtle_world.launch```, it looks to be the same value as when I run ```minimal.launch```. It's very long, but here is the first part:
"\n\n\n\n\n\n
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