Re: multi camera projections

["Tim Leydecker" <BauerOink(at)gmx.de>]

I could use some help. The shader works but when trying
to rebuild it to directly work on a partition, I´m getting stuck
with the Texture Generator missing the option to specify a
camera as it´s basis and the partition refusing to accept a camera
projection as well. This means I would have to manually link
each newly created objects to all the existing Camera projections.

Kind of tedious. I´d use planar projections instead but one
can´t "render through" them to get an image useable as a
base for the holdout image and projected color image.

I fiddled with a lightmap, used as a colorsampler but
unfortunately (ahem, logically) this isn´t based on the
facing polygons of the texture projection used as a
calculation base but also contains the one facing away.
Resulting in more and more overlays depending on the
amount of geometry "X-ray´ed" with that projection.

Any ideas?

Cheers

tim


----- Original Message ----- 
From: "Tim Leydecker" <BauerOink(at)gmx.de>
To: <XSI(at)Softimage.COM>
Sent: Wednesday, February 28, 2007 1:14 PM
Subject: Re: multi camera projections


> So,
>
> here´s a basic setup, pretty much following Antonin´s idea.
>
> http://www.hafenlola.com/downloads/ley_Antonin_MultiCamProjection.zip
>
> Effective area of each camera´s projection can be affected
> by playing with their respective Incidence>scalar bias&gain.
>
> It´s also likely a good start to try out each mixer seperately,
> then paint an imagefile texture for first Camera and use the
> other projections to sucessfully fill in/touch up details, using
> whatever splotch of matte fits those areas as a replacement
> or input for the respective incidence nodes.
>
> I´m sure there´s an easier way but it´s a start.
>
> One problem is to get rid of the projections and mattes still
> appearing on the backside (facing way that camera) sometimes,
> which the gain&bias attributes don´t handle well but which can
> be eliminated by using 90° in the incidence node and fiddling knobs.
>
> It´s o.k. sofar but I´d welcome a more elegant network...
>
> Cheers
>
> tim
>
>
>
> ----- Original Message ----- 
> From: "Tim Leydecker" <BauerOink(at)gmx.de>
> To: <XSI(at)Softimage.COM>
> Sent: Wednesday, February 28, 2007 8:45 AM
> Subject: Re: multi camera projections
>
>
> > New dawn, new day, fresh ideas. Bad breath with a funny taste, tho...
> > SoI´m trying to come up with something easy to (p)reset and digest.
> >
> > Is there a way to have something like a "Texture reference object"?
> > That´s a Maya term, describing the link of a static object used for
> > projecting textures and UV coordinates and having those magically
> > appear on the deforming mesh - without having to explicitely transfer.
> >
> > As an extra asset, would XSI´s hierarchical editing mode, e.g. the
> > modeling construction, shape, animation and secondary shape mode
> > allow to have a system that takes the position of an object at the
> > current time into account? Frame 1, projecting through camera 1
> > and blending the result with a projection on frame 10 through
> > camera 10, even thought there´s deformation or movement?
> >
> > The advantage would be, simply, you have a turntable starting
> > at frame 1 with the basic pose and the character is moving it´s
> > arms so you can add "makeup" under his armpits at frame 10.
> > Like using the deformation test to splotch on colors that fit it.
> >
> > As I said, that´d be an extra asset - most likely using wheightmaps?
> >
> > First, I´d like to get the mattepainting workflow nailed (ahem, copied).
> > Here´s an article that has another nice implementation or usage described:
> >
> > A-mazing, CafeFX using XSI, the bit about "crazy legs" on page 2:
> > http://features.cgsociety.org/story_custom.php?story_id=3940&page=2
> >
> > Cheers
> >
> > tim
> >
> >
> >
> >
> >
> >
> >
> >
> > ----- Original Message ----- 
> > From: "Tim Leydecker" <BauerOink(at)gmx.de>
> > To: <XSI(at)Softimage.COM>
> > Sent: Tuesday, February 27, 2007 10:18 PM
> > Subject: Re: multi camera projections
> >
> >
> > > Hi guys,
> > >
> > > thanks for the suggestions. Peter´s workflow is similar to what
> > > I´d do with ZBrush/ZAppLink to Photoshop, it´s just that this
> > > time there´s loads of objects, instances and no good UVsets.
> > >
> > > Coming to think of it, I guess what I really am after is a way
> > > to keep the projections "alive", blend them using the painted
> > > holdout mattes and only rendermap if absolutely neccessary,
> > > saving on having to unwrap all those many little bits and pieces.
> > >
> > > Stupid enough, I´m sure I had an appropriate shading network
> > > preset for this fiddled together allready but I can´t find it anymore.
> > >
> > > Must be on backup somewhere, the entire process was inspired
> > > by Jeremy Pronk´s Projection shader www.thereisnoluck.com
> > >
> > > It´s most likely that mine was not that elaborate, thought.
> > > Oh, I don´t know. Maybe I´ll just take a brake for today...
> > >
> > > Cheers
> > >
> > > tim
> > >
> > >
> > >
> > >
> > > ----- Original Message ----- 
> > > From: "peter boeykens" <peter_b(at)skynet.be>
> > > To: <XSI(at)Softimage.COM>
> > > Sent: Tuesday, February 27, 2007 9:56 PM
> > > Subject: Re: multi camera projections
> > >
> > >
> > > > the workflow I used in the past was to create a good UV projection for the 
> > > > object.
> > > > and  one camera projection per photo.
> > > > rendermap each photo to the uv projection,
> > > > layer them in photoshop and paint the blending there.
> > > > it required some back and forth between photoshop and XSI while painting, but it 
> > > > wasnt too bad.
> > > >
> > > > you could paint a vertex map or weightmap for the blending of each 
> > > > cameraprojection in XSI, rendermap them too, and bring them into photoshop, in 
> > > > order not to have too much trial and error while painting...
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > ----- Original Message ----- 
> > > > From: "Tim Leydecker" <BauerOink(at)gmx.de>
> > > > To: <XSI(at)Softimage.COM>
> > > > Sent: Tuesday, February 27, 2007 8:27 PM
> > > > Subject: multi camera projections
> > > >
> > > >
> > > > Hi there,
> > > >
> > > > I know this has come up before but I can´t find it in the archives...
> > > >
> > > > I´m looking for the best way to mix multiple camera projections
> > > > and successively baking them into textures without destroying the
> > > > results of the previous projections, either by limiting the effect to
> > > > "facing" geometry or by painting an additional holdout matte for
> > > > areas that shouldn´t be affected in re-baking.
> > > >
> > > > Obviously a workflow inspired by anime/cell/matte painting.
> > > >
> > > > Great examples (some even used XSI) would be in the Animatrix
> > > > and Final Fantasy (3d) films, it´s that what I after, technically at least...
> > > >
> > > > Cheers
> > > >
> > > >
> > > > tim
> > > >
> > > >
> > > >
> > > >
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