You don't have to work with an all black preview, and you never had too either. Yes some shader setups don't compute properly in Superfly, in the preview. But the same can be said about that in Firefly with complex shaders too. You can have lights that light up the preview and do nothing in the render as well. 

This goes right back to knowing how the engines actually work, and understanding how to do things.

You can also do things in Superfly that you can not in Firefly. One being vector math mods to shaders without a million nodes. The other is control SSS depth, color, and type, on multiple layers of SSS/ (You don't have to use Poser layers to do so either)

The shader above works well, in Firefly, but it is missing a lot..... It does use Firefly's micropoly displacement advantage thou. But is also has many disadvantages compared to Superfly. Veins appear blue for a reason, and that reason has a lot to do with SSS control that is next to impossible to do in Firefly. So where is the blue SSS in the veins on the shader above? Well, there isn't any handling for it at all. It would be a very large shader setup in Firefly to do so. Superfly, no where near as many nodes to get the same result, but it is still a lot. You need more image maps than diffuse and a vascularity map or a ton of procedural stuff to do so, in both engines.. Most content doesn't come with those maps, and they never will at Poser content prices either.

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