Glass that starts out broken

This tutorial assumes you already know how to create breakable glass, if not then follow that tutorial first.

• Open one of your maps or make a new one.
• Make a func_breakable_surf with a frame around it (as if you are making a normal breakable window).
• Set up an env_explosion in the middle of the window, then change the options as follows:

Class: env_explosion
Keyvalues		Comments
Name	<name>	<name> is whatever name you wish to give to this entity
Magnitude	1

• Then in the flags tab, change the flags as follows:

	Flag
		No fireball
		No smoke
		No decal
		No sparks
		No sound
		No fireball smoke
		No particles
		No Dlights

• Set up a logic_auto near the env_explosion (it doesn't matter where you put it, but I recommend that you put it in a convenient place)
• Change the entity outputs for the logic_auto as follows:

		My output	Target entity	Target input	Parameter	Delay	Only once	Comments
		OnMapSpawn	<name>	Explode			Yes	<name> is the name you gave the entity in the third step above

• Then in the flags tab, change the flags as follows:

	Flag
		Remove on fire

• Test your map! When it loads the env_explosion will break the glass leaving the jagged glass edges on the side of the frame.

Broken glass that breaks when the map starts

Alternative method

• Name the func_breakable_surf you created in step 2 above.
• Don't create the env_explosion entity in step 3 above.
• Do create the logic_auto entity in step 5 above.
• Change the entity outputs for the logic_auto as follows:

		My output	Target entity	Target input	Parameter	Delay	Only once	Comments
		OnMapSpawn	<name>	Shatter	0.5 0.5 128		Yes	<name> is the name you gave the func_breakable_surf entity

• Adjust the parameter above as desired. Changing the size of the third number (128) will change how much of the window is broken.