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nemesis schrieb:
> clipka <ano### [at] anonymousorg> wrote:
>> As good as MCPov renders tend look - they're actually physically wrong.
>> Have a look at this:
>>
>> The following images show a 100% white diffusely reflecting plane
>> (actually a large slab; left side),...
>> Reflection is perfect, i.e. 100%.
>
> I don't think perfect reflection is physically possible. 100% white is tough
> too.
Nonetheless computations with such theoretical maximum values give clear
indications about the general quality of an algorithm. As far as that
goes, MCPov apparently sucks: It can do no more than 50% white without
adversely affecting some feature or the other, and that's /definitely/
below even the /practical/ maximum.
Whole milk, for instance, ranges at around 85%. And special materials do
indeed achieve a diffuse reflectance of 99% and higher in the visble
spectrum (e.g. Labsphere Spectralon).
As for perfect specular reflectance, I only used it to create a
reference surface in the image anyway, but for instance water-to-air
interfaces come extraordinary close to perfect reflection.
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