Failed to display hokuyo node message on Rviz in Virtual machine.

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I use parallel Desktop 6.0 on macbook to install ubuntu 11.04.

I run the following instructions:

  rosrun hokuyo_node hokuyo_node
  rosrun rviz rviz -d `rospack find hokuyo_node`/hokuyo_test.vcg

result:

Orbit views:

Obviously it is not correct. Because the laser data point is not only a line.

When I try the same laser range finder at the other computer,it works normal.

Like this screen shot:

How to fixed it?

Thank you~