Alien Swarm: Reactive Drop SDK
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The Alien Swarm: Reactive Drop Authoring Tools, also known as an SDK, is a set of software utilities that allow you to create your own missions, weapons, aliens and other gameplay elements.
Contents
Availability
The Alien Swarm: Reactive Drop Authoring Tools, like the original, are freely available on Steam to all owners of the PC version of 
Alien Swarm: Reactive Drop.
Downloading and installation
To install or run the Authoring Tools, either click here or:
- Open the Steam window.
- Click on the LIBRARY tab and then the TOOLS tab.
- Double-click on the Alien Swarm: Reactive Drop - SDK entry.
- The Alien Swarm SDK and Authoring Tools will download to your computer via Steam.
- Once it has been fully installed, you will be able to launch it in the same way you installed it (from the Tools tab).
You can also create a desktop shortcut by right-clicking on the Alien Swarm Authoring Tools entry and clicking Create desktop shortcut from the context menu.
Note:For the Authoring Tools to function correctly, it is important that your installation of Alien Swarm: Reactive Drop is fully up-to-date, or matching the version of the game itself (if you are using the beta version). You can make sure of this by running the game before launching the Alien Swarm: Reactive Drop Authoring Tools. Simply launching the game then quitting after you get to the main menu is sufficient. You can also click on the game > right click and select Properties > then go to Local Files > Verify integrity of game files...What's included?
The package includes:
- Hammer, the Source level editor (4.1 Build 7397)
- Suite of command line compiling utilities, such as
studiomdland map compiling tools - Updated Particle editor
- Updated Faceposer
- Example campaign
- Tutorial maps
- SketchUp plugins
Where do I go from here?
Note:Much of the stuff and documentation from 
Alien Swarm are also applicable to Alien Swarm: Reactive Drop- To learn how to make a custom campaign addon go here: Swarm Campaign Add-on Tutorial
- The Swarm Mapping basics is a good place to go if you are familiar with Source mapping already. If not, you will need to master the basics of Source level design first (Level Design).
- Another good way to start creating your own levels is using the SketchUp Source Tools.
- If you want to learn about how to create content for the Source Engine in general, the main page of the Source SDK documentation is a good place to start.
Bugs and issues
- Post all issues and bugs in the Steam Community - Discussions.
- See the Source SDK FAQ for answers to general SDK questions.
- For level design and Hammer editor issues, see the Level Design FAQ.
See also
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