Well I did use variable reflection and the radiosity includes normal and
media clculations, checking the stats I think the main slowness is due to
the camera being inside the bounding box for the isosurface as only 2pc of
the isosurface rays intersection tests actually hit the isosurface, woops,
maybe the containing box needs optimising. Accuracy was set to 0.0001. Oh
well.......

Kev

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