> What data is saved in the first pass? Is it specific to that camera
> position, direction, up, right etc? Or does it calculate radiosity
> throughout the entire scene, even off camera?

The radiosity is calculated only in places that are visible from the current
camera position (or through reflection/refraction). However, that data is
stored in 3D space, so you can reuse that data even if you move the camera.
In theory only the newly visible areas will be recalculated if you load the
original data. I haven't tested this.

> Is the data specific to the image size, or can I do the first pass at
> 800x400 and the second at 1600x800 (even if accuracy is lost) or will
> that apply the save radiosity to the (eg) upper left corner of the
> resulting render?

The data is not linked to the image size. It's possible that increasing the
resolution will require more radiosity calculations on top of the original
data in order to account for the greater level of detail. Again, I haven't
tested this.

 - Slime
 [ http://www.slimeland.com/ ]

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