[Cheeseh]

thanks, yeah I've had a small look at that. There is a small thing though, there was a comment saying that is won't work on HL dedicated server (The interface would be NULL), meaning that clients wanting to make waypoints on a dedicated server might not be able to. I'll have a go at it anyway for now.

edit:

Actually I think the DebugOverlay stuff will ever only work for the local client, there is no input as to what player this should be sent to, even in the Line function it just picks the local player and works with it to determine what the local player can see to clip lines, but is not passed to the engine debugoverlay functions.