Here's a few more links to threads on RDNA which show various details about how IBL works in Poser 6... Creating Pseudo-IBL's In Photoshop A Tip About IBL Converting HDRI Images For Use In Poser 6 IBL lighting study

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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.