[Bf-cycles] Possible Transparent BSDF bug?

[Matthew Heimlich]

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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