Does servers require unmodified game?

[FaithLV]

So, I was thinking to make some DirectX hooks, to make graphics (colors and visual stuff) sightly better.
I haven't tried it now, but before I start...will servers accept modified client?

[zesty]

It's confirmed that SweetFX is incompatible with the hook under DX9, if you want to enable it then you have to set it to DX 10 or 11 in your settings.

[Rodney]

There's no anti-cheat (for example punkbuster) that would check your file hashes or modifications to the running application, so you're good to go.

As long as you don't modify map files which would result in an error you will be able to play.

[FaithLV]

Well, looks like dx9 doesn't accept any injected dll, nor does dx10 version. (game just terminates itself)
Won't even bother to try it for dx11.

EDIT: My bad, got it working.