MatchMove scene – 3D mask possible?

Hi,
I’ve tracked a shot in and set up the scene in Nuke, I’ve then used the smae camera in Houdini for a snow man that I’ve created. Upon importing the exr sequence into Nuke, I now need to introduce a mask to the scene as the ‘snow man’ is supposedly outside, meaning I need to mask the window frames.

I’ve tried and tried multiple ways. I got close when I hooked a roto up to a card, plugged that into the scene, then merged the scanline render output with the the snow man exr, still didn’t deliver the desired result though. I either end up with the roto not sitting in 3D space correctly, or it just not being a mask by the time it comes through the scanline.

Any ideas what I’m doing wrong? (Hopefully this makes some kind of sense).
Thanks in advance.
Chaz

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