Problem with water

Big entities tend to be visible across the map, so if you don't have big structures to block their visibility then players will see them through sky. Easy fix is to move your map parts so they are not above each other when you use sky, or build some things to block visibility if possible.

However that is bad mapping practice and good suggestions would be to adopt proper mapping habits:
- Don't build levels above areas with sky, keep your map layout logical and realistic.
- Compile your map with "VIS -full" option for better FPS and no visibility bugs.
- Don't group too many objects into one entity. I find best results when objects within area of about 512 units maximum are grouped together (func_wall/func_detail etc.).
- Try to avoid creating very large entities. If you have complex shaped water area then its better to use several small entities instead of big one.
- Use func_illusionary (Contents: water) instead of func_water as much as you can. It doesn't have waves, but players will have much better performance.
- Use NULL texture on non-visible sites of your entities, water entity should have water texture just on the top.

Maybe you know some of that, but its a good reminder for everyone who gonna read it.

Changed all water to func_illusionary but still can see it in the sky.