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[MAJOR BUG] MLT Bidirectional caustic bug :)

Posted: Fri Aug 17, 2007 12:36 pm
by CoolColJ
as it says - same settings but separate renders, pic says it all :lol:

used V0.9test 6

Posted: Fri Aug 17, 2007 1:06 pm
by Zom-B
Do you mean that both results were archived by rendering the same igs file two times???

attaching the scene would really help dude :wink:

Posted: Fri Aug 17, 2007 1:22 pm
by CoolColJ
attached - make sure all files and folders are in the same directory.
This is how SKindgo exports em out

Posted: Fri Aug 17, 2007 4:33 pm
by OnoSendai
So... what's the bug?

Posted: Fri Aug 17, 2007 4:40 pm
by CoolColJ
have a look at the position of the caustic on the bottom of the glass sphere :)

same scene, 2 different renders, it moved

possibly related to the Sun movement bug

Posted: Fri Aug 17, 2007 4:42 pm
by OnoSendai
That's not a bug, it's just an odd case of slow convergence. Let it render for longer.

Posted: Fri Aug 17, 2007 6:14 pm
by Cire
I think CoolColJ is referring to the 'caustic' ON the bottom of the sphere itself (I believe it's actually a reflection or refraction) . . . not the caustics on the floor beneath the sphere.

Posted: Fri Aug 17, 2007 6:21 pm
by OnoSendai
Cire wrote:I think CoolColJ is referring to the 'caustic' ON the bottom of the sphere itself (I believe it's actually a reflection or refraction) . . . not the caustics on the floor beneath the sphere.
That's what I'm referring to as well.

Posted: Fri Aug 17, 2007 6:38 pm
by Cire
Well then . . . that is as you said, an odd case of slow convergence.

Posted: Fri Aug 17, 2007 6:57 pm
by Zom-B
the problem is, that you can't reproduce this issue with the scene :?
I did 5 renderings for 45minutes each on 2x2ghz dualcore.

But I have to admit that since 0.9t1 reflections on specular materials need VERY long to convergence!
some wired reflections stay for long time till they disappear (WinOSi Test Scene for example)