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There are a few things here. Firstly there seems to be some information missing from the laser scan message:

angle_min: 0.0
angle_max: 0.0
angle_increment: 0.0

Without these values the ranges cannot be converted to cartesian points, so the scan cannot be shown.

The tf motor output is what we would expect, it is only concerned with the relationship between different frames, if you're only using one frame as you are then you don't need any transforms.

Finally, are you sure there isn't a typo (even an extra space at the end) of the RVIZ fixed frame. I can't see why you'd be getting a TF error if your scan frame_id is the same as the fixed frame.

Hope this helps.