Alpha maps in HPL2

[WALP]

So, is there any solution I can use to make something like... Glass for instance?

It seems sort of ridiculous that I wouldn't be able to do something that simple.

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I did a work around, so nevermind in the short run.

In the long run, if anyone has had success with it, it'd be nice to know how it was done. Thanks anyways.

For glass use transluent and alpha will be set to black. So you wanna have a black image and paint the scratches and dirt and whatever is on the window over it.
There might be other ways to do this but they[frictional] have done it like this at least a few times in amnesia so I thought I would just do it like so for now.