POV-Ray : Newsgroups : povray.general : Patterned Textures and Turbulence : Re: Patterned Textures and Turbulence Server Time
25 May 2022 06:41:08 EDT (-0400)
  Re: Patterned Textures and Turbulence  
From: Chris R
Date: 12 May 2022 10:15:00
Message: <web.627d163c962984031441ea85cc1b6e@news.povray.org>
"Chris R" <car### [at] comcastnet> wrote:
> Alain Martel <kua### [at] videotronca> wrote:
>
> > > I am working on some scene elements with painted wood, where the paint is
> > > chipping away, exposing the underlying wood texture.  Since the paint and wood
> > > have different finishes and normals, I want to use a texture_map rather than
> > > layered textures.
> > >
> > > If I just do scaling/rotation/translation transformations on the texture
> > > pattern, I know how to compensate for that in the textures in the map so those
> > > transformations apply to the overall pattern, but not the patterns of the
> > > individual textures.  However, I can't figure out how to add turbulence to the
> > > texture pattern without having it affect the textures in the map.
> > >
> > > Is this even possible, or do I just need to avoid turbulence in patterned
> > > textures?
> > >
> > > -- Chris R.
> > >
> > >
> > You can apply your turbulence with a negative value :
> >
> > warp{turbulence -1} should undo warp{turbulence 1}
>
> Ah, thanks.  I should have thought to try that.  I was concerned about how that
> would affect lambda and omega, but if I understand turbulence correctly, those
> act more like multipliers on the turbulence value and should thus be negated if
> turbulence is negative as well.
>
> -- Chris R.

So, I tried this and it doesn't seem to work.  The picture below shows an
example of an object with a gradient x texture_map with leopard and bricks as
the sub-textures.  The middle picture applies a turbulence just to the gradient
pattern.  The 3rd picture applies a negative turbulence to each of the
sub-textures first.


-- Chris R.


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