Silo can use (free) POVRay with 'one click' so they say to render. POVRay isn't the fastest renderer but depending, it may well be faster than the export > import into Poser and render cycle.

I'm not a modeler so I don't know how Carrara's capabilities shap up but it is a full featured package and you can use your Poser runtimes directly. Carrara 6 Pro and possibly 7 by now have been available on some 3D magazine cover disks. You can probably get more info in the Carrara forum.

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