POV-Ray : Newsgroups : povray.advanced-users : Make moon ground like tiled textures : Make moon ground like tiled textures Server Time
2 Oct 2022 19:06:05 EDT (-0400)
  Make moon ground like tiled textures  
From: Warren
Date: 7 Aug 2022 07:05:00
Message: <web.62ef9bb3d944a28168fd1a5de756b296@news.povray.org>
Hello/Hi

I'm currently trying to make moon ground textures that would fit perfectly for
tile mapping
I tried to achieve this with the following concept, if for example, you use
(let's say) the wrinkles and the crackle pattern like
this:
----
#declare CracklePig =
pigment{ crackle color_map{
[ 0 color srgb 1 ]
[ 0.05 color srgb 0 ]
[ 0.95 color srgb 0 ]
[ 1.0 color srgb 1 ]
} }
#declare WrinklesPig =
pigment{ wrinkles color_map{
[ 0.33 color srgb 0 ]
[ 0.66 color srgb 1 ]
} }

#declare FinalPig =
pigment{ gradient z pigment_map{ [ 0.33 CracklePig ][ 0.66 WrinklesPig ] } }

plane{y, 0 pigment{ FinalPig } }
----
Here, povray will make a smooth transition between the two 'redefined'
CracklePig and WrinklesPig in 'FinalPig'.


I tried to achieved the same with a code like this so that the wrinkles pattern
loops back on z:
----
#macro MakePig(TranslateVect)
    wrinkles translate TranslateVect
#end

#declare FinalPig = pigment{ gradient z pigment_map{
[0 MakePig(< 0, 0, 0 >) ]
[0.2 MakePig(< 0, 0, 0 >) ]
[0.8 MakePig(< 0, 0, 0.8 >) ]
[1.0 MakePig(< 0, 0, 0.8 >) ]

plane{y, 0 pigment{ FinalPig } }
----
But that doesn't work, there is a break in the 'gradient' pattern continuity on
z. Eventually, if that had worked I would have made an 'isosurface' with a
'#declare PlaneFunc = function{ y }' and the above Pigment (with .gray keyword
of course).
So my question is: Is it possible to make some kind of tile texture with fractal
noise patterns like 'wrinkles' that would be perfect for tile mapping ?
Or maybe I'm mistaking about how the fractal noise patterns work ?
Do you have a technique I didn't think about to achieve this ?

I'm attaching a image to give you an example of what I want to achieve (but that
image doesn't work 'well' for tile mapping).

Thank you.


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