Find Danger Zones using Mobile Lidar Data

[chandra_sekhar_reddyguda]

I have mobile lidar data collected from Train. Points covered Right and Left side of train along the track. Using this point cloud I have to find out danger zones, where any object comes (points may be signal or vegetation) inside of given tolerance. 

For this we have to create a cube size object Cube Height 5 meters Cube Width 3 meters these dimensions may be vary from area to area.

After creating this cube objects I have to find out points which comes inside of this cube. Don't require any of below or above points of cube .

Kindly suggest can we do in ArcScene , and provide your suggestions in order to complete this task.

For this requirement  I have to make it an automation.

In the above image red color points are inside of cube.