Please no radiosity! Any other GI algorithm, light tracing, photon mapping, but please no radiosity! LOL. I have to agree with Stewer on this one. Irradiance/Photon mapping or light tracing would be a much better GI solution for Poser. ChaosGroup, creators of the Vray render engine, have recently come out with something called "light mapping", which is supposed to be faster than photon mapping. An example situation would be to use Photon mapping for the first bounces, and light mapping for the secondary bounces.

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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.