Making breakable glass respawn?

have you tried messing with the outputs?
Will look soon into it.
<edit> Hmm forgot how to do it, but i think its possible,
hmm if any one can help, am curious about how to do it now </edit>

Create an env_entity_maker which spawns the glass of the type you want, and place it in the centre where you want the glass to spawn. Set the output on the glass so that when it breaks, it triggers a logic_relay (as the glass entity will be killed), set the logic_relay's output to spawn another glass through the env_entity_maker. Set the delay time on the spawn output to the time you want the glass to respawn in.

I hope that works.

You create a window and make it a point_template. Then you can respawn the template using an
env_entity_maker.