<div dir="ltr"><div style="text-align:left">I actually made some tests and Filter Glossy is much better<br>choice than diffuse trick, at least for some scene/purposes.<br><br></div><div style="text-align:left">Filter Glossy produced less noise and it didn't introduced<br>
some additional indirect lighting, like diffuse would.<br>It looks more like rough glossy indir than diffuse indir,<br>which in most cases would be preferable I guess.<br><br></div><div style="text-align:left">Diffuse indir introduces more light form sides when filter glossy indir <br>
gives more directional reflection of light:<br><br><a href="http://i.imagebanana.com/img/e30odrz7/Selection_073.jpg">http://i.imagebanana.com/img/e30odrz7/Selection_073.jpg</a><br><br></div><div style="text-align:left">but Sebastian's shader would be very useful when option<br>
"No Caustics" needs to be turn ON.<br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/1/15 Brecht Van Lommel <span dir="ltr"><<a href="mailto:brechtvanlommel@pandora.be" target="_blank">brechtvanlommel@pandora.be</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On Tue, Jan 15, 2013 at 4:10 PM, Nate Wiebe <<a href="mailto:natewiebe13@gmail.com">natewiebe13@gmail.com</a>> wrote:<br>
> After watching this video by Sebastian (<a href="http://youtu.be/4-yCJlcXjOg" target="_blank">http://youtu.be/4-yCJlcXjOg</a>), I'm<br>
> wondering if it's possible to have this happen in the background<br>
> automatically when enabling 'No Caustics'.<br>
><br>
> It seems to me that the purpose of No Caustics isn't to remove GI or bounce<br>
> lighting. It would be a pain to have to manage two sets of materials if you<br>
> want to render a scene sometimes with and sometimes without caustics during<br>
> an animation.<br>
<br>
</div>The option No Caustics should keep doing what it does, similar to<br>
other render engines were you can also just disable caustics without<br>
the render engine trying to add in a replacement. It is the intention<br>
of this option to remove a light path.<br>
<div class="im"><br>
> If it doesn't become the default action, it would be great to have an option<br>
> somewhere to make this happen without having to change the materials. It<br>
> greatly improves the scene without adding in the overhead of caustics.<br>
><br>
> If there is a reason this could not work properly, I'd like to hear.<br>
<br>
</div>Well, the Filter Glossy option is intended exactly for this, however<br>
perhaps it's not working as well as it could. Currently higher values<br>
here will increase the roughness in Glossy BSDF's, but more roughness<br>
doesn't quite make it diffuse, and diffuse tends to give less noise.<br>
Perhaps we should improve this option so that the surfaces gradually<br>
become diffuse. In fact for some BSDF's this would happen<br>
automatically but it's not the case for the ones we implement.<br>
<br>
Also, the trick in the video works ok for the diffuse-glossy case but<br>
it only solves part of the problem. A rough glossy reflection followed<br>
by a sharp glossy relection will still show the same noise, the Filter<br>
Glossy option was intended to handle both cases. So I think it would<br>
be better to look into improvements there.<br>
<br>
Brecht.<br>
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