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I've been trying to develop a texture which resembles old
paper/parchment. I've not yet got the effect I want - I can get a
texture that looks fine from a distance, but cannot get something which
has that fibrous look close-up. I'm also having trouble matching the
tan/brown colour of old paper (maybe I need a color_map?). The only
other "catch" is that I need something which'll render relatively fast,
as I'm going to be using this in a fairly long animation - i.e. I'm
trying to avoid functions and isosurfaces.
Here's what I've got so far - the pigment is white; just to highlight
the texture. As you can see, I've got a long ways to go:
#declare T_Paper = texture {
pigment { color rgb <1,1,1> }
normal { wrinkles 1 scale 0.01 }
finish { diffuse .7 roughness .0085 ambient 0.2 }
}//end paper texture
Any ideas?
Bryan
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I get the best results with paper textures by using an image_map and
bump_map together. You can find some good paper textures on Paul Bourke's
site, http://local.wasp.uwa.edu.au/~pbourke/texture_colour/paper/. Use the
original as your image_map and use another, the same original converted to
grayscale, as a bump_map. (You can use the same image for both but the
creases won't be so pronounced) Then use something like:
pigment {
image_map {
jpeg Paper.jpg
}
}
finish {
ambient 0.1
diffuse 0.5
}
normal {
bump_map {
gif Paper.gif
bump_size 6 //reduce for wrinkles, increase for creases
interpolate 2
}
}
It works best if you want heavy creases or folds.
Steve Klebs
http://www.cloudinthesky.com
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Bryan Heit <bjh### [at] NOSPAMucalgary ca> wrote:
> Stephen Klebs wrote:
> > I get the best results with paper textures by using an image_map and
> > bump_map together.
>
> Looks like that's the route I'm going to have to take. My first
> attempts with the bump maps and image maps looks far better then any of
> my textures developed over the last 2 days.
>
> Thanx for your help
>
> Bryan
Here's a procedural texture for a coarse grain paper (normals based on
leopard pattern):
#declare paper = texture {
pigment { granite
color_map {
[0 color rgb <1,0.98,0.95>]
[0.2 color rgb <1,0.98,0.95>]
[0.21 color rgb <1,0.96,0.83>]
[0.3 color rgb <1,0.96,0.83>]
[0.4 0.5 color rgb <1,0.98,0.95> color rgb <1,0.98,0.95>]
[0.51 0.6 color rgb <.77,0.54,0.33> color rgb <.77,0.54,0.33>]
[0.61 0.9 color rgb <1,0.96,0.83> color rgb <1,0.96,0.83>]
[0.91 color rgb <.77,0.54,0.33>]
[1 color rgb <.77,0.54,0.33>]
}
scale 0.5
}
}
texture { pigment { color rgbt <1,0.96,0.83,0.1>}
normal { leopard 1 turbulence 1.7 scale 0.01 }
}
- Mike
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