Le 19-05-15 Ã 10:11, William F Pokorny a Ã©critÂ :
> On 5/13/19 1:56 PM, Norbert Kern wrote:
>> "Jasper" <nomail@nomail> wrote:
>> OK, this doesn't have anything to do with radiosity - so I agree on
>> point precision issues as cause...
> Is this still true for you with recent v38 releases?
> I'd captured the case(s) you posted a couple years back - my notes say
> in 2016. I wasn't able to run what you posted directly on my little
> machine, but a cut down scene was fixed when I tested a v3.71 branch
> March 17, of 2017.
> Bill P.
The version don't matter when you hit the FPU's limits.
Don't forget that in computing the illumination, there are a few
squaring and square roots involved. This typically demand twice the
number of bits of the input value if you want to avoid loss of precision.
When you square a 64 bits floating point value, you need 128 bits to
accurately represent the result.
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