Quote - Poser refraction is broken. I try not to say that. I don't know why they coded it this way, but it only participates in what the camera sees. It does not participate in what the shadow calculator sees. As you pointed out, the only way to let light pass through and illuminate what is behind or on the other side of the refracting surface is to use transparency. But transparency combined with refraction will produce double images, one image bent, the other not. There is no solution. I hate it. I try not to talk about it because it is a long time now with no attention and I can't explain why my friends at SM display no interest in fixing this after so many years.

I'd be preaching this one from the mountainside.

This makes a huge impact on how realistic a scene can look, and prevents Firefly users from achieving true realistic results with refractive materials.  The disheartening part is that SmithMicro know about this for a long time now, and do nothing to fix it.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.