Valve Hammer Editor, commonly known as Hammer, is a map creation tool for games that use Valve's Source engine. It is freely available to owners of the Source SDK.

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Steam hammer.exe Load custom textures for other players?

I sometimes make maps with custom textures, models, materials, sounds, etc. and I showed one of my map creations to my friend, and the custom textures were pink-and-black. It was intended to be a ...
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Can't Use Hammer Editor Grid or 3d Camera [closed]

I can't place anything (tried Shift + R) and it shows two white lines making a right angle when I open a map. I can't edit my maps currently. Can anyone help? An alternative to editing maps? Only ...
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Why are all my brushes black when I test the level I built with Hammer?

In Valve's map-making tool Hammer, I have created several brushes which I use as walls, ceilings, and floors. I've added textures to them, and I have a light entity on the ceiling. all the props and ...
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How can I make an object “solid”?

In Valve's software Hammer (Counter-Strike Global Offensive SDK Hammer software, for reference), I have created several props that I plan to have players jump on. However, players pass right through ...