How to add a button to your level tutorial - Half-Life 2

[page=Adding a button]
This is a fairly short and simple tutorial that will show you how to add buttons to your map. For the example we are going to create a button, that when hit will ignite a zombie. After learning this it is easy to use buttons for other purposes. This is my first tutorial, so sorry if it's not very clear.

Adding the room and models

First off we will create a simple room. Add an npc_zombie (name it zombie1) in the middle of the room and place your info_player_start near it. Create a prop_dynamic and choose a button model for it. Place this model on the wall near your info_player_start.

func_button

Next, we want to create a brush about the size of your button model and place it inside your button model. Give it the toolsinvisible texture. Convert this brush to an entity and make its class function _button. Go to the Outputs tab and click add.

Now fill out the propeties as shown in the above picture. and hit apply.

Conclusion

Compile the map, walk up to the button, and hit e. The zombie should burst into flames ( :) )
Now you can experiment with func_button try using it to unlock a door or toggle a light on and off. Have fun!

- Salohcin