[Bf-cycles] Fireflies with Velvet Shader?

[Shaul Kedem]

good building instructions:
http://wiki.blender.org/index.php/Dev:2.6/Source/Render/Cycles/Building

On Tue, Nov 8, 2011 at 6:09 PM, Jordan Miller <jrdnmlr at gmail.com> wrote:

> thanks! will have to figure out how to build blender so I can confirm
> and get my renderings done. the howto build page is pretty complete so
> it should be straightforward.
>
> care to post your .blend test file and example renders before and
> after? then we will all be on the same page.
>
> jordan
>
>
>
> On Nov 8, 2011, at 5:36 PM, David <erwin94 at gmx.net> wrote:
>
> > Hi,
> >
> > Just as a starting point, the attached patch seems to get rid of the
> fireflies (at least in my test scene).
> >
> > <velvet.patch>
> >
> >
> > On Nov 7, 2011, at 3:22 AM, Brecht Van Lommel wrote:
> >
> >> The code is in:
> >> intern/cycles/kernel/svm/bsdf_ashikhmin_velvet.h
> >>
> >> Usually this is caused by division by a very small number (or zero).
> >> The question is how to solve this properly, which values to clamp, and
> >> by how much so that it doesn't aversely affect pixels that are
> >> rendering without fireflies.
> >>
> >> Brecht.
> >>
> >> On Mon, Nov 7, 2011 at 2:35 AM, Jordan Miller <jrdnmlr at gmail.com>
> wrote:
> >>> great thanks! I'll pull down the code, which file should I look in?
> >>>
> >>> jordan
> >>>
> >>>
> >>>
> >>> On Nov 6, 2011, at 3:43 PM, Brecht Van Lommel
> >>> <brechtvanlommel at pandora.be> wrote:
> >>>
> >>>> It's indeed a bug, the shader needs to be carefully checked still to
> >>>> avoid these issues, it's on the bugs list now.
> >>>>
> >>>> Brecht.
> >>>>
> >>>> On Sun, Nov 6, 2011 at 9:07 PM, Jordan Miller <jrdnmlr at gmail.com>
> wrote:
> >>>>> hmm... but it only happens with the Velvet shader. Why would there
> be fireflies on the velvet and nowhere else? Does anyone know of a
> workaround? This makes it seem more like a bug and less like a "tradeoff".
> >>>>>
> >>>>> jordan
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> On Nov 6, 2011, at 2:33 PM, Kel M wrote:
> >>>>>
> >>>>>> Fireflies are completely normal in Cycles. It's not really a bug,
> more of a tradeoff with unbiased raytracers.
> >>>>>>
> >>>>>> On Sun, Nov 6, 2011 at 2:13 PM, Jordan Miller <jrdnmlr at gmail.com>
> wrote:
> >>>>>> Hi,
> >>>>>>
> >>>>>> I keep getting fireflies with long renders with Velvet Shaders (see
> attached). Google can't seem to find discussions about this. Any
> suggestions where in the code or the setup is the problem or how to do a
> workaround?
> >>>>>>
> >>>>>> I've tried all other types of materials but velvet works really
> well here for me so I'm really hoping a solution is out there. Please
> advise.
> >>>>>>
> >>>>>> thanks!
> >>>>>> Jordan
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> <FirefliesWithVelvetInCycles_Highlighted.png>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> _______________________________________________
> >>>>>> Bf-cycles mailing list
> >>>>>> Bf-cycles at blender.org
> >>>>>> http://lists.blender.org/mailman/listinfo/bf-cycles
> >>>>>>
> >>>>>>
> >>>>>> _______________________________________________
> >>>>>> Bf-cycles mailing list
> >>>>>> Bf-cycles at blender.org
> >>>>>> http://lists.blender.org/mailman/listinfo/bf-cycles
> >>>>>
> >>>>> _______________________________________________
> >>>>> Bf-cycles mailing list
> >>>>> Bf-cycles at blender.org
> >>>>> http://lists.blender.org/mailman/listinfo/bf-cycles
> >>>>>
> >>>> _______________________________________________
> >>>> Bf-cycles mailing list
> >>>> Bf-cycles at blender.org
> >>>> http://lists.blender.org/mailman/listinfo/bf-cycles
> >>> _______________________________________________
> >>> Bf-cycles mailing list
> >>> Bf-cycles at blender.org
> >>> http://lists.blender.org/mailman/listinfo/bf-cycles
> >>>
> >> _______________________________________________
> >> Bf-cycles mailing list
> >> Bf-cycles at blender.org
> >> http://lists.blender.org/mailman/listinfo/bf-cycles
> >
> > _______________________________________________
> > Bf-cycles mailing list
> > Bf-cycles at blender.org
> > http://lists.blender.org/mailman/listinfo/bf-cycles
> _______________________________________________
> Bf-cycles mailing list
> Bf-cycles at blender.org
> http://lists.blender.org/mailman/listinfo/bf-cycles
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.blender.org/pipermail/bf-cycles/attachments/20111109/0151e0ae/attachment.htm