Night (with stars) skybox
I want to create a 2D skybox corresponding to a starry night. The problem is this: I can't find the appropriate skybox texture name for that. I've entered sky_white, sky_black and sky_fog, and ALL of them give the same dark-bluish kind of a "sky", which doesn't seem like a night sky by any stretch.
Would appreciate help of any kind..
Four seconds;
Valve Developer Community. Search function. Portal 2 skybox list.
EDIT: okay, my bad. Looks like Portal 2 doesn't have one as a default skybox texture. You might have to create it.
15 seconds;
Game Banana. Search function. Space skybox.
Begin Looking for one you like.
Yes of course I've already looked at it. And as I said, no matter which skybox texture name I try, the result is always a dark bluish kind of texture above...
EDIT: I see... but as far as I remember there was a night-sky skybox in one of portal 2 chapters? (the wheatley finale for instance)
Yes, there was.... hmm... Hammer, Texture Browser, Skybox in the filter. Try out "finale_stars" for your skybox ?
Or try this one I got from GameBanana (I think) over a year ago... see attached
Those are 3D skyboxes. I don't believe those textures work for 2d. https://www.youtube.com/watch?v=40oIyq5IWPk
PortalStories.com
"Oh, in case you got covered in that repulsion gel, here's some advice the lab boys gave me: DO NOT get covered in the repulsion gel."
Doesn't work 
There are several textures like skybox/br_stars01, skybox/stars01, so I tried entering "stars01", "finale_stars" and "br_stars01". In all these cases I get a distorted visual glitch when I look up, which seems to indicate that these aren't recognized as valid skybox texture names. The only ones that work are those listed on VDC
@RustyDios: Thanks! In what directory do I put the files from the archive?
@iWork925: That makes sense. It's why they're not valid "textures" I suppose...
They go into materials/skybox folder... you might need to create it. Then use stars01 as your skybox name... that should work..
EDIT : even though its for TF2, this tutorial is actually really good I think at explaining skyboxes... the same principles still apply to Portal2 
There are several textures like skybox/br_stars01, skybox/stars01, so I tried entering "stars01", "finale_stars" and "br_stars01". In all these cases I get a distorted visual glitch when I look up, which seems to indicate that these aren't recognized as valid skybox texture names. The only ones that work are those listed on VDCThe problem with the skyboxes from gamebanana etc are that they're for not-portal-2-games, and afaik the vmt's have the "Sky" shade, which, in portal 2, causes the weird glitch.
If you change the first line of all vmfs from the sky to "LightmappedGeneric" they should work
Yeah true. I had already changed the .vmt for the Space/stars to UnlitGeneric. Maybe LightmappedGeneric would be better... ...