[Bf-cycles] what is wrong with Cycles shading?

[Sergey Sharybin]

AFAIR, the issue with such scene is that because of the quite large
discontinuity between surface and normal shading point bounces below the
surface, causing such artifacts.

The idea might be to push point back on the surface, but it's tricky to do
fast and without artifacts somewhere else.

On Sat, Jul 23, 2016 at 6:50 PM, Mohamed Sakr <3dsakr at gmail.com> wrote:

> thanks guys, so what are the alternatives other than increasing subd or
> light size? I mean code wise "other solutions even if they are biased, by
> introducing some epsilon?"
> @Sergey : ideas? (where to introduce the epsilon)
>
> On Fri, Jul 22, 2016 at 8:23 PM, Jens Verwiebe <info at jensverwiebe.de>
> wrote:
>
>> Simon wrote a nice roundup how to avoid this problem:
>> http://www.luxrender.net/forum/viewtopic.php?f=16&t=12915&sid=491a9ddde516d57dd801dfab3f728992#p122655
>>
>>
>> Jens
>>
>> Am 22.07.2016 um 19:17 schrieb Matthew Heimlich:
>>
>> This is a terminator error. Without introducing bias, this exists in
>> every path tracer. There's really not much to be done about it aside from
>> increasing the resolution of the mesh.
>>
>> On Fri, Jul 22, 2016 at 1:11 PM, Mohamed Sakr <3dsakr at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> there is a potential problem with Cycles shading.
>>> please help to clarify what is going wrong.
>>>
>>> @Sergey , @Brecht
>>> this scene is just a light, sphere and a plane., sphere subd = 32. ,
>>> even if the sphere is not perfect, it got a remarkable problem in shading,
>>> what causes this, + how to solve it.
>>>
>>> cheers,
>>> Mohamed Sakr
>>>
>>> [image: Inline image 1]
>>>
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>>> Bf-cycles mailing list
>>> Bf-cycles at blender.org
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>>>
>>>
>>
>>
>> _______________________________________________
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>>
>> --
>>
>> Jens Verwiebe
>> Allerskehre 44 - 22309 Hamburg
>>
>> Tel.: +49 40 68 78 50
>> mobile: +49 172 400 49 07
>> mailto: info at jensverwiebe.de
>> web: http://www.jensverwiebe.de
>>
>>
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>>
>
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>


-- 
With best regards, Sergey Sharybin
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