Hello,

I've read http://radsite.lbl.gov/radiance/papers/erw92/paper.pdf which
explains how to use irradiance gradient (rotational (rotation of the normal)
and translational (sample point translated)) to improve extrapolation of
radiosity between sampling locations. Then I looked at pov source and I
didn't recognize anything in the gradient it calculate, in fact I don't
understand what exactly is this gradient... I tried to desactivate it then
render some radiosity scenes but see no differences ! I may have done
something wrong, so if anyone can confirm this .. ?
The rotational gradient seems easy to add to pov radiosity, but the
translational gradient is more difficult to implement (because it uses
radiance differences between neightboring samples)

M

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