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From HalfLife 2 Knowledge Base

by Taz00

In this tutorial we create a breakable window that shatters like the ones found in the map cs_office. We will be using two entities, func_breakable_surf, and env_cubemap.

How to make breakable glass

First we need to make a block brush, then apply the toolsnodraw texture to the whole brush, then apply glass/glasswindowbreak070a to the face you want to be seen.(shift+a)

Now select the brush and tie to entity ( CTRL + T ), and scroll down until you find func_breakable_surf hit apply and close the properties window.

Now add a env_cubemap (not needed but gives the window a shiny effect) open the properties for the env_cubemap and click the "Pick" button, then click the window. Hit apply and close the properties window.

That’s it, now just compile it!

It will look like this when in-game: