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On 7/11/2016 12:52 PM, fsv2712 wrote:
> "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.
>
>
your code example indicated that you're using v3.7, but the link you
referenced is for v3.6.2
check out:
http://wiki.povray.org/content/Reference:Light_Source#Light_Fading
there's some additional information ... /maybe/ it's relevant
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