The Source Engine is an engine used by Valve in their games. Questions with this tag relate to creating mods using the Source Engine.

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Understanding some variable names in the quake engine

I am doing a bit of research for a project about air acceleration in the quake engine. I have a question about the names of the variables and their definitions. The code that I am looking at is ...
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Why are my brushes see-through in Hammer/CS:GO?

I'm making a map for Counter Strike: Global Offensive, but I am having this issue with a part of the map. One of my brushes is weird and see-through in game. I have no clue what is causing it or how ...
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How can I make a chronometer for an HL2: EP2 Mod?

I'm trying to make a chronometer for a mod I created. I looked on the web, but there are only countdown timers for TF2, nothing for HL2: EP2. In my case, it is an absolute necessity to use HL2: EP2. ...
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Fix broken Portal 2 Chapter Handling in my Mod

I am running again into issues where my mod and the Portal 2 base game do not like each other! In order to provide the proper menu background images and the music for each of the 5 (internal - ...
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Adding a video to a Level in a Portal 2 Mod

I'm currently working on my Portal 2 mod and I'd like to add a video to be displayed on a projector like the Dollar$ and SENSE video at the end of Portal 1. Currently what I have is a simple ...
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SourceSDK/Hammer Saferoom creation. NoDraw trigger brushes

When creating a safe room at the end of a map in SourceSDK (Left 4 Dead 2) you must surround the room with 'no draw trigger brushes'. Can anyone clarify this? Does this mean that the room must be ...
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How are the packet boundaries in the Source engine DEM format determined?

I'm trying to write a program that reads Source DEM files, and about all I can at this point is the header which is a magic string, few ints and floats and 280-long strings. The last field in the ...