Hi, I have a correctly working urdf model that i use inside rviz to display a robot and i would to add the visual effort indication as this http:// wiki.ros.org/rviz/DisplayTypes/Effort but when i try to enable it nothing happens (the topic are correctly publishing the effort data and there is no errors, the joint are continuous)

this is the joint states message that report also the effort

header: seq: 39879 stamp: secs: 1384008918 nsecs: 173034906 frameid: '' name: ['pan', 'tilt', 'hubfl', 'hubfr', 'hubpl', 'hubpr', 'shaftfl', 'shaftfr', 'shaftpl', 'shaftp_r'] position: [-0.19993987679481506, -0.3998797535896301, 0.17936893275759974, 0.1979537816102363, 0.17858727416318004, 0.1996941781970845, 0.0, 0.0, 0.0, 0.0] velocity: [0.19993987679481506, 0.19993987679481506, 0.0, -0.0, -0.0, 0.0, 0.0, 0.0, 0.0, 0.0] effort: [0.0, 0.0, -0.1875, -0.375, -0.1875, -0.125, 0.0, 0.0, 0.0, 0.0]