Re: multi camera projections

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

Hi Rob,

I don´t fully get it. It is true, I have one of the objects with projection
and add more it kinda works, they all get the color but how would
I create or link a camera projection directly onto a partition initially?

What I´m getting looks wrong and differs from manually linking
new objects (in that partition) to the projection cameras?

Here´s the scene - if that´d help:

http://www.hafenlola.com/downloads/MultiCamProjection01.zip

Cheers

tim


----- Original Message ----- 
From: "Robert Moodie" <rmoodie(at)buzzimage.com>
To: <XSI(at)Softimage.COM>
Sent: Wednesday, February 28, 2007 4:34 PM
Subject: RE: multi camera projections


> Not with you there - if you apply a material (branch) to a partition and use a 
> camera projection all objects in the partition will use it.
>
>
>
>
> > -----Original Message-----
> > From: Tim Leydecker [mailto:BauerOink(at)gmx.de]
> > Sent: Wednesday, February 28, 2007 10:24 AM
> > To: XSI(at)Softimage.COM
> > Subject: Re: multi camera projections
> >
> > 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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