[Bf-cycles] Possible Transparent BSDF bug?

[Brecht Van Lommel]

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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