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I've seen urdf_to_collada fail if it was invoked without the package that contains the resources the urdf refers to on the package path. Without more information: it should not matter, but I found it easiest to invoke urdf_to_collada in the directory containing the urdf (ie: /urdf in ur_description).

The .dae should then appear in the cwd.

I've seen urdf_to_collada fail if it was invoked without the package that contains the resources the urdf refers to on the package path. Can you make sure ROS can find the ur_description package? Something like:

rospack find ur_description

should return the correct directory.

Without more information: it should not matter, but I found it easiest to invoke urdf_to_collada in the directory containing the urdf (ie: /urdf in ur_description).

The .dae should then appear in the cwd.