Trigger a console command when the player enters a trigger brush tutorial - Half-Life 2

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Console command triggered when the player enters a trigger brush. The example used makes the Crosshair appear or disappear. Basic knowledge of hammer is assumed. This tutorial is ideal for cut-scenes where crosshairs get in the way.

Posted by SGTMattyW on Nov 4th, 2006 - Basic Mapping/Technical

[page=Trigger any console command when the player walks through a brush]
Console command triggered when the player enters a trigger brush. The example used makes the Crosshair appear or disappear. Basic knowledge of hammer is assumed and required. This tutorial is ideal for cut-scenes where pesky crosshairs get in the way.

For the sample map used in this tutorial click here.

In your map, create a point_clientcommand. Name it whatever you want, I'm using 'Client'.
Now create a trigger brush. This is where if you walk into your command will fire.

Name the trigger brush: Trigger (Or whatever you want, just make sure you use the same name later on if needed)
Now tie the trigger brush (Ctrl+T) to a trigger_once entity. Leave all of the options the same.

Make an output on the trigger:

My &#111;utput named&#58; OnStartT&#111;uch
Target entities named&#58; Client
Via this input&#58; C&#111;mmand
With a parameter &#111;verride &#111;f&#58; &#39;C&#111;ns&#111;le C&#111;mmand here&#39;

Replace 'Console command here' with the command you wish to be triggered and bang! Done!

[page=Examples and conclusion]

This is great for cut-scenes in the middle of a game. Just follow the tutorial I showed you on the first page but instead of 'Console command here' have:

cr&#111;sshair 0 &#40;T&#111; rem&#111;ve the cr&#111;sshair&#41;
cr&#111;sshair 1 &#40;T&#111; make the cr&#111;sshair appear&#41;

Next, I'm going to show you how to turn the crosshair off when the map loads. This is off topic a little but never the less it still follows the same sort of guidelines.

Place a point_clientcommand very close to your info_player_start. Now name it whatever you want, I'm using 'Client2' so it doesn't clash with my previous tutorial. Now create a logic_auto close to it. You should use these on the outputs for the logic_auto:

My &#111;utput named&#58; OnMapSpawn
Target entities named&#58; Client2
Via this input&#58; C&#111;mmand
With a parameter &#111;verride &#111;f&#58; cr&#111;sshair 0

To make it run smoother, tick the 'Fire once only' box. This doesn't particularly matter, but it may make the game less laggy.

From this tutorial you have hopefully learned how to create console commands on a trigger when the player walks through a brush. You should also be able to recognize the similar coding throughout my tutorial.

There you have it, a quick and easy way to run console commands without the player knowing it!