POV-Ray : Newsgroups : povray.general : Need help with texture_map : Re: Need help with texture_map Server Time
2 Mar 2024 12:58:01 EST (-0500)
  Re: Need help with texture_map  
From: Chris R
Date: 22 Mar 2023 11:45:00
Message: <web.641b22099474913b879be96c5cc1b6e@news.povray.org>
Josh English <Jos### [at] joshuarenglishcom> wrote:
> On 3/21/2023 7:13 AM, Chris R wrote:
> > Josh English <Jos### [at] joshuarenglishcom> wrote:
> >> I solved this problem a couple of years ago with my "Portland Burns"
> >> image. The hard drive with all my code died and I can't seem to recreate it.
> >>
> >> The idea is to create a texture map that allows for a transition between
> >> two other textures with a transition zone in-between. A quick sketch:
> >>
> >> box {
> >>     <0, 0, 0>, <1, 1, 0>
> >>     texture {
> >>         planar
> >>         texture_map {
> >>           [clock-0.01 Final_Texture ]
> >>           [clock-0.01 Transition_Texture ]
> >>           [clock Transition_Texture ]
> >>           [clock Clear_Texture ]
> >> }}}
> >>
> >> But if I scale this texture or add turbulence on the outer texture, the
> >> inner textures are also scaled or transformed.
> >>
> >> I swear I had pulled this off before but I can't suss it this time.
> >>
> >> Any suggestions?
> >>
> >> Josh English
> > I generally solve this problem by using a pigment_pattern{} in the outer texture
> >   rather than the pattern directly.
> >
> > texture {
> >      pigment_pattern {
> >          planar
> >          // apply transformations here
> >      }
> >      texture_map {
> >         [clock-0.01 ...]
> >      }
> > }
> >
> > That way your transformations apply to the planar mapping without distorting the
> > textures inside of the texture_map.  I believe you can also apply the
> > transformations within the body of the outer texture and it will still only
> > apply to the pigment_pattern without altering your inner textures.
> >
> >
> >
> > -- Chris R.
> >
> >
>
> I think that's it. It works just like I remembered my Portland Flag
> image. For some reason using pigment_pattern in a top level of the
> texture definition seems, well, wrong.
>
> Thank you.
>
> -- Josh
Think about pigment_pattern as a pattern that uses a pigment to define the
boundaries for the *_map you want to use, rather than a pattern that applies to
pigments and it won't seem so wrong...


-- Chris R.


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