Image Based Lighting Tab
Bryce 6 introduces Image-Based Lighting (IBL) which uses an image to light your Bryce scene in addition to traditional Bryce lighting. Bryce 6.1 added additional controls and a completely different IBL algorithm.
Please note that because of the extreme differences between the Bryce 6 and Bryce 6.1 algorithms, there is no easy conversion method from HDRI scenes created in Bryce 6 to the same scene in Bryce 6.1.
The IBL Tab contains controls for adding an HDRI image, setting the quality and intensity, the HDRI Effect, Falloff and Radius, and whether to render the image as the scene background or not.

Links to sites providing HDRI Maps/Information:
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