May I suggest some few things?:
- For your trench walls use terrain patches instead of brushes;
- Make sure your trench walls are not straight;
- Use blending;
- Rotate textures.
I made this a long time ago:
I.imgur.com
You can see I applied sort of all the suggestions I made to you. It is far from perfect though. You could take a look at how the trenches are done in the game 'Verdun' (ww1 shooter). Of course CoD2 engine has it limitations but you might get some inspiration out of it.
Keep up your work though! It is nice to see that people still make maps for CoD2 :).
usselite
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