<div dir="ltr">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.<div><br></div><div>The idea might be to push point back on the surface, but it's tricky to do fast and without artifacts somewhere else.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Jul 23, 2016 at 6:50 PM, Mohamed Sakr <span dir="ltr"><<a href="mailto:3dsakr@gmail.com" target="_blank">3dsakr@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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?"<br>@Sergey : ideas? (where to introduce the epsilon)</div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jul 22, 2016 at 8:23 PM, Jens Verwiebe <span dir="ltr"><<a href="mailto:info@jensverwiebe.de" target="_blank">info@jensverwiebe.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<p>Simon wrote a nice roundup how to avoid this problem:
<a href="http://www.luxrender.net/forum/viewtopic.php?f=16&t=12915&sid=491a9ddde516d57dd801dfab3f728992#p122655" target="_blank">http://www.luxrender.net/forum/viewtopic.php?f=16&t=12915&sid=491a9ddde516d57dd801dfab3f728992#p122655</a></p>
<p><br>
</p>
<p>Jens<br>
</p><div><div>
<br>
<div>Am 22.07.2016 um 19:17 schrieb Matthew
Heimlich:<br>
</div>
<blockquote type="cite">
<div dir="ltr">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.</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Fri, Jul 22, 2016 at 1:11 PM,
Mohamed Sakr <span dir="ltr"><<a href="mailto:3dsakr@gmail.com" target="_blank">3dsakr@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi,<br>
<br>
there is a potential problem with Cycles shading.<br>
please help to clarify what is going wrong.<br>
<br>
@Sergey , @Brecht<br>
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.<br>
<br>
cheers,<br>
Mohamed Sakr<br>
<br>
<img src="cid:part2.60599E9E.135A8028@jensverwiebe.de" alt="Inline image 1" height="408" width="544"><br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div><span style="color:rgb(102,102,102)">With best regards, Sergey Sharybin</span></div></div>
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