"Bald Eagle" <cre### [at] netscape net> wrote:
> I'll just say that your sphere has a radius, and the point source doesn't.
> So it's 1 radius closer than the point light.
> Move the sphere 1 radius further away from your surface and see what happens.
>
> Work from there.
No, that's not the problem. The sphere gives 1/2 of the brightness of the point
light.
Now I've reviewed the attenuation law of light at
http://www.povray.org/documentation/view/3.6.2/317/ and the trick is that I
should divide the intensity of the point light by 2 according to the formula at
that page if I want to reproduce the behaviour I obtain with the sphere.
Many thanks for your help anyway.
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