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 Problem with strange blown out areas 
gabrielsilver


Joined: 25 Nov 2005
Posts: 6
Location: Dortmund, Germany
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Recently I ran into a problem that didn't show up in earlier tests...
I rendered a model, created a zbuffer map the usual way and let DOFPRO run over it. Then I noticed something new: When I used the "enhance highlight" feature a bit too much (at least I guess so) it created a blown out (overlit) area which got bigger than the original bright area and ran over the model (thats good, as it is a real effect with photography too) but: on the corners of this overbright area no DOF was applied and a jagged alias corner showed up instead. Is this a known problem?

(I'm doing this to practice procedural materials a bit more Cool)

BTW, I'll add a few pics to the gallery soon, so be prepared Twisted Evil

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richardrosenman
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Joined: 23 Oct 2005
Posts: 145
Location: Canada
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GabrielSilver;

That's utterly disgusting (but a pretty nice render!) Wink

There is a known and documented issue that when you push the highlight enhancement too much, you can get aliasing, although I've never seen it so severe.

Are you using a standard depth map? White to black? If it's non standard in any way it might be good to post it.

Martin, what do you think of this (the aliasing, not the sh*t). ha ha!

-Richard

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Richard Rosenman
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gabrielsilver


Joined: 25 Nov 2005
Posts: 6
Location: Dortmund, Germany
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Yes, richard, it's a standard 0,0,0 to 255,255,255 depth map generated by a distance falloff map in max + vray. The blowout alias effect started with enhance values as low as 7 while the aperture slider was at 12.5 . Decreasing highlight threshold amplified the problem too, to a certain point where neither changing threshold to a lower value or enhance to higher values made things worse. Maybe having the background as bright as it is in the upper left corner of this picture with the object in focus being rather dark increased the effect too.

Here are both the rendered image and the depth map I used (well, it's still disgusting, maybe even more so since I added a bit of detail) so you
are able to reproduce this aliasing effect.

http://www.gabrielsilver.de/jobs/dofpro/dofpro_diffuse.jpg
http://www.gabrielsilver.de/jobs/dofpro/dofpro_z.jpg

greetings,
Christian
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martinvicanek


Joined: 23 Oct 2005
Posts: 49
Location: Germany
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Christian,

yak, you sure hava a unique way of reporting a bug!

The sharp boarderline looks like an artifact somehow. We have seen problems before which could have a similar origin. If it turns out to be a DOF PRO bug we'll fix it.

Your website has lots of great stuff, I am curious to see your gallery contributions!

Regards
Martin

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Martin Vicanek
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monkey


Joined: 21 Jan 2006
Posts: 4
Location: UK
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what a beautiful excretion (procedurally i mean) all it needs is some fluffy mold.....or is it a fresh one? Shocked
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