Venom3 has in the solo run, makes a high-density texture package for RtCW single player. The SP HD Pack is not ready completely yet and still has beta status but spare contain over 300 revised and new textures (of 900).
The new textures are considerably better. For real RtCW fans a reason playing the game again.
Simple insert the pack in main folder.

Download the pack here

Source: rtcw4ever