That can be done in Firefly too! Use a Blender node and plug what you want inside on Input_1, what you want outside on Input_2. Set Blending to 1, and connect it to a Math Functions node set to Step argument with value 1 as 0 and value 2 as one, and connect value 2 to an N node with x 0, y 0 and z 1.

I believe it was Bagginsbill who posted that trick here years ago - back then, I had the bad habit of saving the material room screenshots without the proper credit.

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.