In a similar way to as it adds the mod of textures in this tutorial:
Moddb.com
Within the worldbuilder:
1 - Open the map and place it in the middle one Skydome:
These Skydomes found under:
"ByNativeType/Civilian/None" and "REGION/Neutral/MISC_Natural"
OR
"ByNativeType/ForMappers"
2- Then edit the properties of the map, as follows
Min Height: Range between 70 and 300
Max Height : Range between 1200 and 1700 ( Or as you think best, your being free to choose 
)
* the color of fog will be seen on the horizon and at altitude. if you think it looks ugly, remove it. your test and decide...
3- Save the map and performs one test in-game, Running one CNC NE FULL VERSION interface (YPSILON_1.0.big, OMEGA_1.0.big or DELTA_1.0.big) alone or with another mod 
ADDITIONAL
4- Then Compile your map with "BuildMap.bat":
Compile the map has two main advantages: the loading time is shorter and disappear those ugly shadows to rotate the camera.
NEED MOD SKD: Commandandconquer.com
INSTRUCTIONS
IN WINDOWS 7 THE MAPS ARE STORED IN THE FOLDER:
C:\Users\YOURUSERNAME\AppData\Roaming\Command & Conquer 3 Tiberium Wars\Maps\
THEN
-(Opens a window of CMD commands in your "MOD SDK" folder, but instead of entering "BuildMod.bat NameOfTheMod", you should put "BuildMap.bat NameOfThefolderOftheMap").
"BuildMap.bat" must run in a command window... for example if your map name is "Dangerous_Neighborhood", the CMD window should look like this:
press enter, the compiler started to compile your map and created 3 new files:
map.imp, map.relo and map.bin
here a tutorial on how to open CMD easy on windows 7:
Sevenforums.com
I recommend option two :D
Ready!
your map will have OMEGACAM and will be compiled.
Now you can share it with everyone 
Sorry for my English.
If you have any questions, post it here and I will try to help you
X3N
Thanks X3N, it actually does load faster.
Thanks Gentlemen
You are welcome bro :)
A VERY MUCH thank you for this :)
was already wondering how to get it.
Yeah,I thought they couldnt see our private messages too. 5 minutes and 41 seconds later unfortunately.xd
Hope Carnius will not be suprised too much whats happening here,in his absence xd.
So there is another way to add maps with the zooming and sky effects without the need of the source code package.
No, Just to add the Skydome... you still need a mod with the correct shellmap and camera configuration ( Like the NE CNC3)... Do you remember? :)
can i have your copy of your tactusA mod with maps includes sky and zooming ?
Nice!
But, the skyboxs of : "ByNativeType/ForMappers"
will only be visible using the full version of C&C3 a new experience, true?
Unfortunately if... But you can use the SkyDomes of:
ByNativeType/Civilian/None
AND
REGION/Neutral/MISC_Natural
These SkyDomes will see in any MOD ( When also using the "Compatibility Core" Moddb.com ) In conjunction with your favorite MOD ;)
Now they have no excuse. You yourself can add sky to your favorite maps...
'Ready!
your map will have OMEGACAM and will be compiled.
Now you can share it with everyone'
Where did people share their omegacam maps with everyone please? I would sure like some more like the official maps for instance, without duplicating the work of someone else (surely someone has done them) if possible.
i use maps that already complier with manifest so i cant use this right ?