The entity for playing a sound in Source is ambient_generic, so create one of those now. For demonstration purposes, we are going to make a sound play as the player walks down the corridor. Now we need something for the trigger to do. The Flags tab includes more options for the entity. Right now these are empty but we will come back here later to make the trigger do something. Moving on to the next couple of tabs we find Outputs and Inputs. For instance, imagine a puzzle in which the player has to find a specific physics object like a cog or battery a trigger could be used to detect only props with a specific name. The Filter Name is a clever way of restricting what entities cause the trigger to be set off. It is often a good idea to give entities a name, as this is how other entities can refer to them, but for this example one is not needed. This first tab, Class Info, gives some basic settings for the entity. LetвЂ™s take a look at this windowвЂ™s tabs in some more detail. From the Class drop-down box, choose trigger_once and press Apply. Anyway, we donвЂ™t need to worry about this right now.

The default вЂњbrush entityвЂќ that your brush has been converted to is a func_detail, a very useful entity that is used for making smaller details in your maps that donвЂ™t affect visibility. The easiest way to do this is to select the brush with the Selection Tool and press Control+T, or right-click on it in the 2D view and select Tie To Entity. To give it a function we have to tie it to an entity. At the moment this block is just a static object that has no effect. Now use the Block Tool to create a brush with this material that covers the entrance to the corridor. These are a range of special materials used for various effects. Next to the currently displayed texture, click BrowseвЂ¦ and in the filter type вЂњtoolsвЂќ. To start with you will need a basic room and corridor you can use the map created in the previous tutorial if needed. We are going to start by creating the most basic type of trigger, a trigger_once. Triggers are special, invisible brush entities that are вЂњtriggeredвЂќ when a player or other entity touches them, causing an effect or sending an output to another entity.

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