[Bf-cycles] Possible Transparent BSDF bug?

[Matthew Heimlich]

It would appear that I was mistaken, or simply very tired. I see that
it is affecting the non-prog integrator as well now.

On Fri, May 3, 2013 at 4:56 PM, Brecht Van Lommel
<brechtvanlommel at pandora.be> wrote:
> I'm not sure, actually the cases I found happen with both the
> progressive and non-progressive integrators, so maybe you are seeing a
> different problem. A .blend file would be useful.
>
> On Fri, May 3, 2013 at 7:29 PM, Matthew Heimlich
> <matt.heimlich at gmail.com> wrote:
>> Yes, I guess it's not so much an outline as it is a different noise
>> pattern in the shape of the head. I'll try increasing the bounces. Why
>> would it be visible with the progressive integrator but not the
>> non-prog, even with very low settings (1-1-1-1-1)?
>>
>> On Thu, May 2, 2013 at 11:33 PM, Brecht Van Lommel
>> <brechtvanlommel at pandora.be> wrote:
>>> I managed to reproduce some noise now with a monkey on a plane. It's
>>> not quite an outline of the object but some noise in various places,
>>> maybe what you are referring to?
>>>
>>> Increasing the transparent bounces solves that particular issue. The
>>> reason it happens is because some rays that bounce to the background
>>> need to go through more than 8 transparent surfaces. The transparent
>>> max number counts all intersections starting from the camera through
>>> the monkey, on to the plane, and then in some random direction through
>>> the monkey again to the background.
>>>
>>> On Fri, May 3, 2013 at 2:03 AM, Matthew Heimlich
>>> <matt.heimlich at gmail.com> wrote:
>>>> I should also note that it only happens when the transparent object is
>>>> in front of another object. I'm just using a Suzanne head, nothing
>>>> complex.
>>>>
>>>> On Thu, May 2, 2013 at 7:55 PM, Matthew Heimlich
>>>> <matt.heimlich at gmail.com> wrote:
>>>>> On my second test it would appear that it only happens with the
>>>>> progressive integrator, not the non-prog.
>>>>>
>>>>> On Thu, May 2, 2013 at 5:29 PM, Brecht Van Lommel
>>>>> <brechtvanlommel at pandora.be> wrote:
>>>>>> I tried a few scenes and can't see this. Mostly likely it's a
>>>>>> self-intersection issue due to float precision.
>>>>>>
>>>>>> On Thu, May 2, 2013 at 10:57 PM, Matthew Heimlich
>>>>>> <matt.heimlich at gmail.com> wrote:
>>>>>>> When using a transparent BSDF set to pure white, an outline of the
>>>>>>> object it's on can be seen until quite a few passes have gone through.
>>>>>>> Is this a bug, or an intended feature of the Transparent shader?
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