When I go play the map at some angles wierd white lines or dots pop up on some objects. I checked out my map on my friends computer too and same there. Here are 3 pictures where you can see the problem, though it is alot more noticable when playing.
I think this also used to happen at times when I made HL2 maps also. Anyone experienced this or have any ideas on it?
Does it happen in custom maps not made by you? It might be something to do with compiling... Not that I know anything about it 
So I just went and checked de_dust and my map, and it does happen in both. But I did figure out what causes the problem, it is Anti-Aliasing, when it was off I had no white lines on either of the maps. I played around with AF and that did not affect the white lines, it was only AA. But turning off AA (2x) makes the graphics ALOT worse, its a must for me. I play with 2x AA and 8x AF and get about 45 FPS. I have a 9800 Pro with the latest drivers. The only other setting I could think of affecting it is Vsync, but I am pretty sure it was like that before I had it on, I will go check right now though. If you have an ATI card and want to see if you get the same problem, turn on AA, go to de_dust, spawn ct and go to the "dark room" on that first entrance the lines are pretty visible for me, and in the room where the floors and the walls meet it is visible.
Without Vsync it was hardly there, but I still saw it, but also my FPS was 15 without Vsync on (2x AA 8x AF). Then I turned on Vsync and my fps went back up to 45, but then I could see the lines more. BTW they flicker and move around depending on how far and the angles you look at them.
I've had the same problem in almost all of my custom maps. I just accepted it as a side-effect of 3D hardware rendering. My fiance, however, was disturbed by these strange white dotted lines. I tried overlapping brushes, but it doesn't solve this problem (and overlapping brushes gets on my nerves too).
I did notice that, in general, when you approach the junction of two brushes, the lines tend to disappear. It's only visible when the player is at some distance from the junction of brushes.
I have a Radeon 9200, by the way. (I know, really old, but I'm stuck with it for now).
