[Help] Wall/floor detection

[Ben_Sherman]

Hey everyone,

I'm quite new to lua coding as most've known, however I'm learning much each day and each day. I want to make an awesome system for admins to kinda "live map" in game but I need to make it so it detects the ground and walls so people aren't placing objects through the ground or the wall, how ever I have no clue how to detect such things via a script.

Any ideas or suggestions?

[DiSaMe]

getGroundPosition 
isLineOfSightClear 
processLineOfSight