Custom Textures for Hammer World Editor [Source Engine] [Tutorials]
Steam Community :: Guide :: How to change the sky of a map
How to Create Custom Textures for the Source Engine – LambdaGeneration
How to Create Custom Textures in Hammer Source by Keith Garry
Source SDK - Custom textures in Hammer - YouTube
Applying Textures - Valve Developer Community
Just finished my war paint based on Hammer editor Dev textures, quite proud of it (it would be awsome if you could vote it in the workshop, link on the comments) :
Need help with blending textures. | TF2Maps.net
Hammer Tutorial: The Basics – LambdaGeneration
can't import custom textures to hammer++ for gmod : r/hammer
Hammer Tutorial V2 Series #13 "Creating Custom Textures, Normals, VMTs, Packing a Level's Content" - YouTube
Hammer Textures in 3D View - Valve Developer Community