how do I work with the glass instance?

[bab-cat-OWO]

I know that the glass instance can be worked with as seen in portal 1 and I've worked with the instance for light glass.

but I really don't know how to work add edges.

[TeamSpen210]

Glass can't be an instance, since it's resizeable and needs to handle things like holes. So there's a specific set of configs to specify how it should generate: https://github.com/BEEmod/BEE2-items/wiki/vbsp_config-barriers