[Sidefx-houdini-list] About shaders

Jordi Bares jordibares at the-mill.com
Sun Sep 30 12:03:40 EDT 2007

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.

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>

> 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
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> --
> Guillaume Laforge
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