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How can simulation multi-layer(vertical) using gpu_ray sensor?

I would like to simulate the Velodyne Laser.

Velodyne sensor vertically and horizontally in a number of Ray information has to be obtained. So, I try to implement as Ray Sensor Plugin, but is very slow.

So, I replace it with a Gpu Ray sensor parameter setting the vertical ranges does not operate. It operates only when set to 1, the Vertical ranges. Is this a bug? All Gpu Ray sensor test code Vertical ranges equals 1.

The following questions look conclusions should be implemented by rotating the Horizontal Laser sensor. http://answers.gazebosim.org/question/5067/how-to-simulate-a-velodyne-sensor/

It does not occur under Issue seems. https://bitbucket.org/osrf/gazebo/issues/946/gpu-ray-sensor-vertical-ranges

Are there any ideas?