[ros-users] how many points in 3D cloud?

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題目: [ros-users] how many points in 3D cloud?

Hi,

following a tutorial on laser_pipeline:
http://www.ros.org/wiki/laser_pipeline/Tutorials/IntroductionToWorkingWithLaserScannerData

how do I know how many points are in the resulting 3D point cloud?

Thanks,

Michal