I want to use the rviz plugin nxtultrasonicdisplay.cpp which receives a nxt_msgs::Range and displays a green cone in front of the robot whose dimensions depends on the value of the range received.

But when I use it I have a problem, the cone is displayed and it changes its dimension on the basis of the range, the problem is that the mesh of the cone is turned of 90° around the z axis from the right position(That is to say that the part which change its dimension on the basis of the range isn't the altitude but the base).

It is impossible to modify the source code nxtultrasonicdiaplay.cpp, so i don't know hoe to fix this problem. Can anyone give me some advice?