But then, if it's a scene you've created in Bryce, why not just render within the scene? 

For giggles I suppose? Or, I guess to use them in another program, or give'em away for free, or sell them. The Evermotion link in the "HDRI's for Bryce 6"; all those HDRI's had been made from a 3D program.

But, yeah you would really need to make 3 (or more) renders for a more true HDRI.

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