Making func_door into a falling platform

Half Life 2 Mapping Tutorial: Making platforms fall down

For maeggs, a platform that will fall down to deter campers.  Load Source SDK and Hammer. Begin by constructing your platform brush and place it on the ground.  

and convert it by selecting and ctrl + t to entity.  Use func_door and call it platform01.  Set the movement directionto UP and set the lip to -512 or whatever number you want.  This will determine the height of the platform from the ground.



Set the flags as pictured below.  'Start as open' will make sure that the platform begins in the air when the map loads.



Now create another brush and convert it to func_button.  Add an output as pictured below, and set the flags as pictured below.





Now when you press the button, the platform will fall down, and stay down depending on the delay you set it to.

Now compile and load your Half Life 2 map!