Why do some maps display odd dark lines?

[Gaius Octavius]

I have been working on a new map and ran into a bit of a snag... I got these weird lines across the eastern portion of the terrain that I can't seem to eliminate. (My apologies if this has been addressed before, but I couldn't find anything when searching.)



Notice they all terminate once the map hits X=0 on the wraparound.

Another interesting spot:




This one also occurs on the X=0 line.


I don't think it's my graphics card, since I run everything on "high" settings, and I even sent the map to a friend to confirm the bug. Apparently, the lines all emerge from the same X column, or very near it. I have seen this occur on other people's maps, but I can't seem to get rid of it here. I reloaded, tried new WB saves, and even tried to alter the surrounding terrain; all that did was move them around a bit.

Is this just a common graphical bug in very large maps?

 

[dutchking]

I think it has to do with Coast vs. Ocean Gaius. I've noticed in WB it gets a bit screwy sometimes.

 

[Gaius Octavius]

Why does it seem to apply out in the middle of the ocean then?

I wouldn't mind so much myself but it clutters up the terrain and makes an otherwise nice map unpleasant looking.

 

[Gooblah]

The same thing occurs on Kevin's Accurate Earth Map. I think it has to do with the computer rendering graphics on the map; it gets strained close to the 'end' of the map, and it probably starts rendering the graphics at the x=0 (the 'start').

 

[Gaius Octavius]

So it sounds like it just happens on large maps then... odd, since I've made some even bigger without problems. Is there any way at all to get rid of it?