First off state when engine you're using
I'm going to asume this is HL2. In that case I do not know cause I havn't looked into the shaders. In unreal 2 though there is a thing called 'self illumination'. I'm pretty positive that HL2 has it too because you see it in some models that have glowing features such as eyes. So look for something along those lines. Also its probably an alpha channel texture over it with the color you want. Again though, I'm not positive on this.
If you talk about HL2 you need to add "$selfillum" 1 in the vmt.
The illumination map can be the alpha channel in your diffuse map.
So you need to make an alpha where white will be 100% self illuminated and black not illuminated at all. So if you got a few windows or lights you want to "glow" you need to do these details bright in your alpha and the rest black.
So you need to do this for Half-Life 1?
If so there is a bit different approach.
http://collective.valve-erc.com/index.p ... 9-55074800
I belive covers that.
sry m8s i ment to say hl2 
You need to have it both self illuminated and see-through?
If so you will need to make another vtf with either the opacity map or the self illumination map as a separate file.
i was stateing usually how i create a alpha channel i dont need to make it see through i just want my windows on certian parts to illuminate . and im not sure how to do it. is there a proper way to creat an alpha channel? in photoshop cs.
Good you got it figured out 
Looking cool even tho it's a bit too bright perhaps.. and there seem to be shadows in the illumination map which kinda makes it a bit wierd in some places. Other than that its nice.
ill post a picture of my 3d sky box when i finish with it 
thanks for your help. by the way that de_halla map you made was the pimp shit loved it. i always wanted to see it converted to source.
heh cool
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