[Sidefx-houdini-list] About shaders

Andrew D Lyons tstexture at gmail.com
Sun Sep 30 18:59:09 EDT 2007


Apparently sidefx has someone preparing a library of default shaders.
Not sure what the eta is though....

Cheers


On 30/09/2007, Jordi Bares <jordibares at the-mill.com> wrote:
> Thanks, will put my head on that tomorrow.
>
> :)
>
> jb
>
>
> On 30/9/07 17:33, "guillaume laforge" <guillaume.laforge.3d at gmail.com>
> wrote:
>
> >> PS. About the translucency, I imagine I will have to jump to VOPS.
> >
> > Yes.
> >
> > Create a vop surface shader.
> > In this new vop add a Global Variable node. Negate N with a ... negate node.
> > Add a lighting model node. Choose Lambertian model. Plug the negate node in
> > the "nN" input.
> > It gives you a basic translucency shader.
> >
> > Cheers
> >
> > Guillaume.
> >
> > On 9/30/07, Jordi Bares <jordibares at the-mill.com> wrote:
> >>
> >> I guess my next step as soon as I finish the project I am in is to go to
> >> our
> >> code and convert it.
> >>
> >> I feel SideFX should address those things that are so important for people
> >> moving away from other tools to start running in a production environment
> >> as
> >> fast as possible.
> >>
> >> Thanks,
> >> Jb
> >> PS. About the translucency, I imagine I will have to jump to VOPS.
> >>
> >>
> >> On 30/9/07 14:41, "guillaume laforge" <guillaume.laforge.3d at gmail.com>
> >> wrote:
> >>
> >>> Hi Jordi,
> >>>
> >>> I agree, a monolithic shader a la Mental Ray mia shader could be very
> >> handy.
> >>>
> >>>
> >>> Translucency effect looks like a good training with vops :-). I think
> >> you
> >>> need to use a negative normal vector for the dot product with the light
> >>> vector.
> >>>
> >>> In vop, you can use a Lambertian lighting model and plug a negative
> >> normal
> >>> vector in the nN input.
> >>> If you need some transparency, it can be useful to mix the translucency
> >>> factor with the transparency factor
> >>> like in the mia shader ( if translucency factor set to 1, transparency
> >> is
> >>> null ).
> >>>
> >>> Since I started to use Houdini, I think about building a monolithic vop
> >>> surface shader network too. If there is something like that on the web,
> >> I'm
> >>> interested too.
> >>>
> >>> Cheers
> >>>
> >>> Guillaume Laforge | La Maison
> >>>
> >>>
> >>>
> >>> On 9/30/07, Jordi Bares <jordibares at the-mill.com> wrote:
> >>>>
> >>>> I am using H8.1 for the project I am working, and specially on the
> >> shader
> >>>> area I feel a bit weird, specially because doesn't seem to have a
> >>>> monolithic
> >>>> general purpose shader that can cope with everydays' basic stuff.
> >>>>
> >>>> I am using VEX Layered surface I was expecting to have other tools also
> >>>> like
> >>>> simple translucency, incandescence...
> >>>>
> >>>> Is there anything I have missed? Would you recommend me to use another
> >> vex
> >>>> shader for the translucency? If so, which one, doesn't seem to be one.
> >>>>
> >>>> On another note, may be a community OTL that has wrapped this?
> >>>>
> >>>> Just as suggestion, here at The Mill we use all the time a monolithic
> >> and
> >>>> very optimized supershader that does all sorts of things, from blurry
> >>>> reflections, thin film, incandescence, transparency tricks, multiple
> >> mixed
> >>>> specular calculations (blinn, phong, etc..) plus we have setup a bunch
> >> of
> >>>> presets that do the job 95% of the cases with minor tweaks, probably
> >> one
> >>>> of
> >>>> the most productive tools we have.
> >>>>
> >>>> Any chance the Houdini community has developed something similar to
> >> share?
> >>>>
> >>>>
> >>>> In any case, I would like to ask specially about the translucency
> >> effect,
> >>>> anyone could point me in the right direction?
> >>>>
> >>>>
> >>>> Thanks in advance
> >>>> jb
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> Sidefx-houdini-list mailing list
> >>>> Sidefx-houdini-list at sidefx.com
> >>>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
> >>>>
> >>>
> >>>
> >>>
> >>> --
> >>> Guillaume Laforge
> >>> _______________________________________________
> >>> Sidefx-houdini-list mailing list
> >>> Sidefx-houdini-list at sidefx.com
> >>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
> >>
> >>
> >> _______________________________________________
> >> Sidefx-houdini-list mailing list
> >> Sidefx-houdini-list at sidefx.com
> >> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
> >>
> >
> >
> >
> > --
> > Guillaume Laforge
> > _______________________________________________
> > Sidefx-houdini-list mailing list
> > Sidefx-houdini-list at sidefx.com
> > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>
>
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>


-- 
=======================================
Andrew D Lyons | Digital Artist | http://www.tstex.com
=======================================



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