[Sidefx-houdini-list] moire patterns

zoran arizanovic zoran.arizanovic at gmail.com
Sat Nov 4 05:33:00 EST 2006


hi zhang
I am doing this in renderman shader
do you know more how lod in rm works on shader basis?
thanks
Zoran

On 11/4/06, zhang xiao <zhangxiao6776 at gmail.com> wrote:
>
> like renderman, mantra is also micropolygon render, and i believe it
> has silimar
> LOD functionality as in renderman.
> xiao
>
>
> On 11/4/06, zoran arizanovic <zoran.arizanovic at gmail.com> wrote:
> >
> > thanks for answers
> > yes this is what I was thinking like some kind of level of detail
> > approximation for near and far frequency of threads
> > zoran
> >
> > On 11/3/06, Simon Barrick <simon at primalpictures.com> wrote:
> > >
> > >
> > > You can do frequency clamping too, which is easier than analytical
> > > anti-aliasing. You can use the area function to determine how close to
> > the
> > > texture you are and then as you approach the aliasing threshold you
> > blend
> > > into an "averaged" version of your texture. Works pretty well.
> > >
> > >
> > > -----Original Message-----
> > > From: sidefx-houdini-list-bounces at sidefx.com on behalf of Andrew D
> Lyons
> > > Sent: Fri 03/11/2006 19:14
> > > To: sidefx-houdini-list at sidefx.com
> > > Subject: Re: [Sidefx-houdini-list] moire patterns
> > >
> > > Procedural patters alias unless you can put some anti-aliasing code in
> > > your shader. The "Advanced Renderman" book has a chapter on that. The
> > > easiest alternative is to use .rat textures instead of procedural
> > > pattterns.
> > >
> > > Cheers
> > >
> > >
> > > On 03/11/06, zoran arizanovic <zoran.arizanovic at gmail.com> wrote:
> > > > hi
> > > > I am trying to do procedural cloth shader for huge baloon
> > > > the problem i have is that close up is ok i see threads but from far
> I
> > > get
> > > > moire patern type noise
> > > > is there any  way to avoid this , or waht would be strategy for
> doing
> > > this
> > > > two different setups for close and far?
> > > >
> > > >
> > > > --
> > > > Zoran Arizanovic
> > > > http://arizanovic.blogspot.com/
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> > > --
> > >
> > > =======================================
> > > Andrew D Lyons | Digital Artist | http://www.tstex.com
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> > --
> > Zoran Arizanovic
> > http://arizanovic.blogspot.com/
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-- 
Zoran Arizanovic
http://arizanovic.blogspot.com/



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