It’s a T-junction limit.
MAX_SURFACE_VERTS is 256, so some face is getting T-junctioned at least that many times, hence the error.
From the Radiant screenshot, it seems that you have a big brush going nearly the entire length of the map from top to bottom.
Nuke that or split it into multiple brushes, and check your sky brushes to make sure they aren’t lying exactly abut with a lot of terrain vertexes.
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hey ydnar, im feeling honored when u answere to by thread 
i will try to split the sky brushes, thx m8!
Im not telling you to give up - just trying to show some common sense
gl with your project cause its gunna take a while
yeah kk…
@topic, still doesnt work… i amde a smaller terrain now… and, its STILL doesnt work!!!
i hate terrains… will make am smaller smaller one now…-.-
what is the size in pixels of the bitmap that u made the terrain from? cuase maybe u can make the bmp half the size and just double the scale in radiant
Well its worth a try, cause it seems u tried almost everything else 
abd it saves u halve the amount of triangles from the terrain.
Or u could always check when u got the error, was it after u addded something special. Ths is ofcourse if u compile alot 
lol, i just went over the thread and i totaly missed the part where he said he got the error compiling without the terrain, if i read that part correctly that is.
Well i cant be the size of the map, cause i just compiled a map the same size and no problems
um i dont geht this error without terrain…
@ydnar, yes easygen does this itselve …well, seems so i have to shoot myselve…
i will make a new terrain, for shure…
ok, i realized, its not the terrain which makes problems… its something with the bridge… i will try to find it! 
[edit]okay, a noew problem,
************ ERROR ************
MAX_MAP_VISIBILITY exceeded
what was that again? i know that i hate that error! :-/
[edit²]
got an answere:
<netron> This error usually comes after this kind of warning: “WARNING: Over 90 percent structural map detected. Compile time will be adversely affected.” The problem with a map causing this kind of error is that it has too many brushes inside of it. you start getting a very complex compilation. You need to simplify it changing little brushes into detail brushes…You have to be carefull though not to turn a brush that closes your map off into detail
i made some parts detail, now the map compiles:D my life is safe^^
seriously - try not to do one big terrain or make high mountains or something scattered around so you can split vis and hint, making one big box will lead to very very bad performance even if you manage to get it running
if it is a massive open map add fog and fogclip, farplanedist to split the VIS block sizes - will help a little
