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I would like to apply this tool in my project but I simply cannot find the corresponding functions.
Could you offer me some guidance about which file should I include?

OK I fixed it. Seems 2.13 do not support the plugin.

I have installed the faro I/O plugin (2.13 alpha, under windows), but still failed to open a fls file. The error message is below:

[Faro] Failed to connect to FARO LS runtime: Cannot instantiate FARO Open interface

Thank you for your reply.
So it is not the surface density of the sphere surface, but a cross-section of the sphere？

I found the equation to calculate the surface density is N/piR^2. What confused me is why it is not N/4*piR^2?
What does this "surface density" represent? Is it the density in part of a sphere?