[Bf-cycles] Sample filtering options

[Nathan Vegdahl]

Yes, I am talking about pixel/sample/AA filters.  Look up the paper "Filter
Importance Sampling" for more information.

As for texture filtering, I'm sure there's more flexibility there, as I'm
pretty sure it uses more standard techniques.

--Nathan
On Aug 6, 2015 8:08 AM, "Yury Baranov" <cucumberer at gmail.com> wrote:

> Hi,
> I was talking about other filters (maybe they called AA filters). There
> are two of them ATM: Box and Gaussian. And Bitmap filters are Smart, Cubic,
> Closest and Linear.
>
> 2015-08-06 18:01 GMT+03:00 Nathan Vegdahl <cessen at cessen.com>:
>
>> IIRC Cycles uses "filter importance sampling" to do its sample
>> filtering.  This has some advantages, but one of its disadvantages is that
>> it doesn't work well with filters that have negative lobes (the resulting
>> renders are very noisy).
>>
>> All the filters you mention have negative lobes, so although they
>> technically could be implemented, my guess is that they won't be.  It would
>> be very unexpected behavior to a user if they switched filters and suddenly
>> their image was twice as noisey.
>>
>> --Nathan
>> On Aug 6, 2015 7:38 AM, "Yury Baranov" <cucumberer at gmail.com> wrote:
>>
>>> Hi. Is it planned to make more sample filtering options like
>>> catmull-rom, sinc, lanczos etc.? Maybe more filtering options for bitmaps
>>> will be good, too.
>>>
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>
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