Re: color shadows

[Arvid Björn <arvid.bjorn(at)palladiumfilm.com>]

You can override the materials in the scene with for example a lambert 
with a superwhite surface to get pure colours tho, if it's for a pass.
http://renderq.net/_temp/cltree2.gif

Stefan Andersson wrote:

> That works too.. almost... the problem is still that the object that
> recives the shadows effect the shadow color. So if we (again) look at
> the example that I linked to you can see that the shadow color in this
> case is not effected at all by the surface that recives the shadow.
> And this was a very complicated solution to a relative simple problem
> (though cudos for trying).
>
> So.. solution #1 and #2 almost works. Let's see if anyone can think of
> a third option :)
>
> regards
> stefan andersson
>
>
> On 11/22/05, Stefano Jannuzzo <stefanojannuzzo(at)tiscali.it> wrote:
>  
>
> > This is the way I would go: the problem has to be approached as a light
> > color problem, not as a shadow color. In fact, you don't have much control
> > on the shadow color by itself.
> > So, you should have a light shader which returns a given color if the
> > rendering point is in shadow, and let's say black if the object is lit.
> > So, say you have a soft_light as your current light shader, with shadow
> > enabled.
> > How can you understand if your point is in shadow or not? Clone the
> > soft_light node, and turn the clone's shadow check off.
> > Now connect the two to a Color_Math_Basic node, with the Subtract option.
> > The output of this node will be 0 if the rendedring point is non shadowed,
> > because in that case the shadow enabler made no difference. Instead, will be
> > non zero if the light is actually casting shadow.
> > From now on, it should be straightfarward. Go into a Scalar_Math_Unary doing
> > the Absolute Value, then into a Scalar_Math_Logic which will tell if the
> > input is 0 or something, then into a Color Switcher. There you'll set your
> > desired color, and finally plug into the Light Shader.
> > Repeat for all ligths.
> > Hope this helps, let me know if you need me to post a rendertree picture
> > somewhere.
> > Stefano
> >
> >
> > ----- Original Message -----
> > From: "kim aldis" <kim(at)cg-soup.com>
> > To: <XSI(at)Softimage.COM>
> > Sent: Monday, November 21, 2005 8:52 PM
> > Subject: RE: color shadows
> >
> >
> >    
> >
> > > So anyway, back to the coloured shadows thing. I've not yet seen a
> > > coloured
> > > shadow solution that renders colour in the shadow areas correctly. They
> > > always only render coloured shadows, leaving the non-shadowed shadow areas
> > > alone. Does the coloured shadow lights thing do it properly?
> > >
> > >      
> > xsi
> >
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> >    
>
>
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