[Sidefx-houdini-list] moire patterns

zhang xiao zhangxiao6776 at gmail.com
Sat Nov 4 05:30:33 EST 2006


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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