POVRay is definitely vastly superior to the P4 render engine, and those images in the link by dan_whiteside are impressive - I don't think Firefly could do that. But how about P5/P6 procedural materials? Poseray/POVray can handle the simple P4 materials easily, but would I have to set up the material nodes from scratch again if I do some fancy stuff in P5/P6 (think face_off's Realism kits)? That would be a major pain. Though I like the Firefly engine, it can do much more than most users get out of it, I'm also impressed by the possibilities of POVray.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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