This is not my real map since I didn't wanna upload my real map incase someone would steal, don't want to risk that!
It's only a quick made map with the problem in it that I need help with, Moving lasers.
So I made little room, with a func_wall in the side of the room that is invisible so you could see the laser coming, that is going to move with two func_trains. But that's the problem. The func_train move, but I don't se any laser, I've checked so many times, I don't know what I am doing wrong :F Please help! thanks
As for the beam, the problem was you didn't set its colour (yours was RGB 0 0 0, meaning black, which is invisible for beams). Setting the colours made it visible.