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@Matt Mlodzienski I think you could create a new render layer without the glass and turn off transmit AOV Then use the Z Depth from that layer along with a Transmission AOV.
@Brian Foley I've never had to do much with render layers. I'll do some reading on them. Would that entail rendering the full scene (ie, beauty pass) again with the window disabled? I know for a lot of AOVs they rely on data from the beauty pass and can't really be rendered separately.