Thanks for your time on that, adp001. Personally I'm sticking with Poser 11 for now. But I'm sure a Poser 12 version of the script would be a nice Christmas present to 12 owners. And Snarlygribbly would likely appreciate it too, as it would be one less thing for him to have to do. 

As for Superfly, a user could presumably just render the snow (hide everything else) in Firefly, and then composite in Photoshop onto the same scene rendered in Superfly? There might be a bit of adjustment of curves and contrast needed, and a need to add a touch of filter noise for surface granulation, but it would probably do.

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Learn the Secrets of Poser 11 and Line-art Filters.