[Sidefx-houdini-list] Camera model

John Coldrick john.coldrick at gmail.com
Fri Nov 30 17:55:25 EST 2012


Sure.  Might work.  I don't think anyone suggested it would be utterly
pointless, but I don't like 'mights' in my pipeline.

J.C.


On Fri, Nov 30, 2012 at 5:47 PM, Szymon Kapeniak
<szymon.kapeniak at gmail.com>wrote:

> As already mentioned the point is that in such a workflow (probably
> commercials-wise), you make low-quality undistorted copy of the footage
> just for technical purposes (tracking/preview etc), while leaving source
> footage as-is, without duplicating it. It can be jpeg sequences, lower
> resolution, sRGB, good for tracking, while editorial works on original
> sources (dpx). Final renders are distorted and come to flame/smoke on exact
> resolution, ready to put onto sources. It's a clean workflow, less
> duplicates, albeit less flexible, but might work for people in commercials,
> when you don't have time to manage copies of sources for different
> departments and track changes in case cuts/takes change.
>
> Mantra is (ironically) harder to extend than a ray tracers coming with c++
> APIs (or rendermans). Own-brew esoteric ifd format, doesn't help either.
> Some sort of programmability outside geometry creation and shaders
> pipeline, would be very helpful, despite of people dislike of distorting
> own renderings :).
>
>
>
> 2012/11/30 John Coldrick <john.coldrick at gmail.com>
>
> > Just jumping in here - I think Colin's point is that you usually can't
> > track distorted plates.  Nothing saying you can't, ever, but that's the
> > first step assuming you're working with full filmback plates - undistort
> > the plate before tracking.  Additionally, pipeline aside, just the notion
> > of burning a distortion into a render seems like a bad idea to me in
> > general.  There's no way to perfectly 'undo' distortion if it's burned
> into
> > the lens.  Anyway, 2c, etc.
> >
> > Hey Colin!
> >
> > Cheers,
> >
> > J.C.
> >
> >
> > On Fri, Nov 30, 2012 at 3:02 PM, Jordi Bares <jordibares at gmail.com>
> wrote:
> >
> > >
> > > > Depending on the footage tracking anything that has some sort of
> > > perceptual distortion has always led to tracking issues somewhere in a
> > > sequence - but to each their own.
> > > >
> > > > Cheers
> > > >
> > >
> > > You would track the undistorted plates but render distorted.
> > >
> > > Jb
> > >
> > > > On 2012-11-30, at 3:26 AM, Jordi Bares <jordibares at gmail.com> wrote:
> > > >
> > > >> You may very well undistort plates yet render distorted, then
> compbon
> > > the original distorted footage to minimise transformations in the CG
> and
> > > the footage.
> > > >>
> > > >> Certainly simplifies the workflow by minimising dependencies.
> > > >>
> > > >> There are creative reasons too like rendering spherical panoramas
> for
> > > rides or immersive experiences and also for projection mapping for
> shows.
> > > >>
> > > >> Hope it helps
> > > >> Jb
> > > >>
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>
>
> --
> skk.
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