 | | | AA and motion blurring a depth pass or not (was RE: DOF and Depth Pass probl | AA and motion blurring a depth pass or not (was RE: DOF and Depth Pass probl 2005-03-22 - By Morten Bartholdy
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I haven't run into a situation yet, so your point about those situations
being rare probably holds true :)
I have pondered over it though, in order to know a way to deal with it
should it occur one day. If I were to point out a possible scenario it might
be a bird flapping its wings flying from out of focus, say in the extreme
foreground and into focus or vice versa. You would need motion blur
especially because of the flapping wings and the degree of focus on the bird
would definately have to be more or less correct - possibly animated, all
dependant on the applied solution.
The bird would primarily show much motion blurring on the wings, meaning the
body may not be terribly blurred before applying out of focus DOF to it.
Still you are right - those occasions would probably be rare indeed.
--
Morten Bartholdy | morten@(protected)
Denmark
-- -- Original Message -- --
From: "Raffaele "ThE_JacO" Fragapane" <jaco@(protected)>
To: <XSI@(protected)>
Sent: Tuesday, March 22, 2005 4:49 PM
Subject: RE: AA and motion blurring a depth pass or not (was RE: DOF and
Depth Pass problem)
> I've been with you on most of this, but I fear I sort of lost you here :)
> Could you provide an example of a situation where you had problems
combining
> the two and it would look weird?
>
> I'm also afraid my perspective is a bit narrow, as I've always only worked
> on filmwork or mixed liveaction+CG commercials, so I can't picture clearly
> cases (like titling, fully CGmovies, logos etc.) where these issues are
> detached from reality and, I'm sure, become more relevant.
>
> I've also found that I hardly ever need moblur and precise DOF in the same
> background, to get that kind of effect you'd need a pretty weird camera
> setup in real life, and if the whole BG is moving that much (either
because
> of the camera move or because it's actually moving objects) moblur will be
> so field filling that a normal blur will do the trick, without going into
> the kind of circle of confusion meldy blur that detailed DOF needs.
>
> ~Raffaele Fragapane
> ~Lead "I'm sure we can make it work"
> ~Peerless Camera Company
>
>
> -- --Original Message-- --
> From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On Behalf
Of
> Morten Bartholdy
> Sent: Tuesday, March 22, 2005 3:53 PM
> To: XSI@(protected)
> Subject: Re: AA and motion blurring a depth pass or not (was RE: DOF and
> Depth Pass problem)
>
> True Raffaele - and for transparent obejcts this is true also. Still with
FG
> and BG split into separate passes there seems to be no cheap solution to
> adding DOF to motionblurred material that I've heard of, except for those
> situations where depth in a given pass can be ignored and a fixed out of
> focus filter can be applied to the separate passes. Any suggestions?
>
> --
>
> Morten Bartholdy | morten@(protected)
> Denmark
>
>
> -- -- Original Message -- --
> From: "Raffaele "ThE_JacO" Fragapane" <jaco@(protected)>
> To: <XSI@(protected)>
> Sent: Tuesday, March 22, 2005 2:23 PM
> Subject: RE: AA and motion blurring a depth pass or not (was RE: DOF and
> Depth Pass problem)
>
>
> > The one thing I think is missing is the context.
> >
> > when would you have a situation where you need a unified depth pass for
a
> > quickly moving motion blurred foreground AND a moving motion blurred
> > background?
> >
> > In those cases you usually isolate the depth passes for the foreground
and
> > background elements to have more range and control on individual items,
> and
> > in that case the artifacts of BG VS FG will not matter since what you
are
> > doing happens in the object/bundle of objects in the respective layers.
> >
> > There sure are situations where these issues may arise, but they seem to
> be
> > mostly exceptions since most times you have a hero in foreground on a
shot
> > plate and only additional props or photogrammetry on the back place.
> >
> > If we consider a single beauty for all the elements, or fully CGmovies
> > rendered in one huge go, I'll agree; but how common a situation is
that?
> > Passes should be sensibly used to split FG and BG layers as well, and in
> > that case you want individual depth passes.
> >
> > ~Raffaele Fragapane
> > ~Lead "I'm sure we can make it work"
> > ~Peerless Camera Company
>
>
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