[Sidefx-houdini-list] Noise

Christopher Crouzet christopher.crouzet at gmail.com
Tue Aug 30 04:32:04 EDT 2016


Yes, that's it—noises are algorithms, some are more demanding than others.


On 30 August 2016 at 15:11, Olivier Jeannel <facialdeluxe at gmail.com> wrote:

> Hi Boris, not sure I understand your method. Why do I need to promote to
> detail ?
>
> Hi Christopher, I didn't know about he fitted output of the Unified Noise,
> thank you !
>
> One more question, here :
> http://www.sidefx.com/docs/houdini15.0/nodes/vop/turbnoise
> It talks about "cost" per noise. What is cost ? Computation time ?
>
> On Tue, Aug 30, 2016 at 9:51 AM, Christopher Crouzet <
> christopher.crouzet at gmail.com> wrote:
>
> > There is the Unified Noise VOP node which fits the output of all the
> noises
> > within the range 0 to 1 :
> > http://www.sidefx.com/docs/houdini15.0/nodes/vop/unifiednoise
> >
> > In the `houdini/vex/include` folder there's a file called `pyro_noise.h`
> > which shows its implementation—it's an interesting place to see how the
> > min/max values are being defined.
> >
> >
> > On 30 August 2016 at 14:43, Boris Cohen Tanugi <b.cohen.tanugi at gmail.com
> >
> > wrote:
> >
> > > Hey Olivier,
> > > Just store it in an attrib to check min max. You can to a 2 pass fit
> > > (setting noise, then promote to detail min/max, then fit the result
> > > accordingly)
> > >
> > > 2016-08-30 9:36 GMT+02:00 Olivier Jeannel <facialdeluxe at gmail.com>:
> > >
> > > > I understand. But sometimes (always) you're deep down in vop and all
> > you
> > > > want is add a little bit of turbulence.
> > > > Am I wrong or is it not possible to get the max-out and min-out
> values
> > > > coming out from noise node ? So that you know what to fit..
> > > >
> > > > Le 30 août 2016 02:41, "François Duchesneau" <sidefx at trinix.ca> a
> > écrit
> > > :
> > > >
> > > > > The anti-Alias noise ranges between -0.35 and 0.35 but as you
> > increase
> > > > the
> > > > > Roughness it tends to go beyond those values.
> > > > >
> > > > > When I haven't played with a particular noise for a while, I like
> to
> > > use
> > > > > it on a straight line in X for example and look at the values in an
> > > > > orthogonal view with different roughness and frequencies. It helps
> so
> > > > much
> > > > > to understand what's in there.
> > > > >
> > > > > Francois
> > > > >
> > > > > On 08/29/2016 10:29 AM, Olivier Jeannel wrote:
> > > > >
> > > > >> Ah ! Thank you Christophe !
> > > > >>
> > > > >> On Mon, Aug 29, 2016 at 4:03 PM, Christopher Crouzet <
> > > > >> christopher.crouzet at gmail.com> wrote:
> > > > >>
> > > > >> Approximate ranges are given in the Turbulent Noise VOP node page:
> > > > >>> http://www.sidefx.com/docs/houdini15.0/nodes/vop/turbnoise
> > > > >>>
> > > > >>> That's not the easiest page to remember IMO—most of the time when
> > > > looking
> > > > >>> for these values, I first stumble upon the Noise and Randomness
> > > > >>> <http://www.sidefx.com/docs/houdini15.0/vex/random> page then
> > wonder
> > > > why
> > > > >>> it's not listed in there.
> > > > >>>
> > > > >>>
> > > > >>> On 29 August 2016 at 20:41, Olivier Jeannel <
> > facialdeluxe at gmail.com>
> > > > >>> wrote:
> > > > >>>
> > > > >>> Hello list,
> > > > >>>>
> > > > >>>> A manual question
> > > > >>>>
> > > > >>>> Each time I use a noise ( AA, Perlin, Sparse, ... ), I can't
> > > remember
> > > > >>>>
> > > > >>> what
> > > > >>>
> > > > >>>> values it is spitting. I know I can read them in  the Geometry
> > > > >>>>
> > > > >>> Spreadsheet,
> > > > >>>
> > > > >>>> but I'm just looking for a place (in the doc ? ) where they
> would
> > be
> > > > all
> > > > >>>> listed and never ask that question again...
> > > > >>>>
> > > > >>>> Thank you :)
> > > > >>>> _______________________________________________
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> houdini-list
> > > > >>>>
> > > > >>>>
> > > > >>>
> > > > >>> --
> > > > >>> Christopher Crouzet
> > > > >>> *http://christophercrouzet.com* <http://christophercrouzet.com>
> > > > >>> _______________________________________________
> > > > >>> Sidefx-houdini-list mailing list
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> > > > >
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> >
> > --
> > Christopher Crouzet
> > *http://christophercrouzet.com* <http://christophercrouzet.com>
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-- 
Christopher Crouzet
*http://christophercrouzet.com* <http://christophercrouzet.com>



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