Ok, we bought an inexpensive lidar knockoff a few months ago, and haven't had time to get to it. Lot's of the documents are in Chinese (thanks Google translate). After all that we have some hints:
-we bought this one, ydlidar x4, https://www.amazon.com/SmartFly-info-LIDAR-053-YDLIDAR-Frequency/dp/B07DBYHJVQ/ref=sr_1_1?ie=UTF8&qid=1544835646&sr=8-1&keywords=ydlidar+x4
-downloaded the sdk from here: http://ydlidar.com/download (be sure to click on the x4 of course, doesn't seem persistent in the link)
-we had to install cmake (since this box is brand new)
-in a terminal, navigate to sdk folder and run cmake - brief wait
-now go to ydlidar/tool/pointcloudviewer/linux directory
-type: sudo ./PointCloudViewer (hint, without sudo prepare for frustration...)
-the play button in the upper left will begin the program that will show points detected on the screen in the picture below
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