> Hi everybody,
>
> i am looking for a specific kind of wood texture.
> In general the wood textures given in "woods.inc" have a cylindrical shape with
> different modifications. For my application i find a combination, which is quite
> near with this short example:
> -----------------------------
> #include "woods.inc"
>
> background { color rgb<1, 1, 1>  }
> camera { location<1.1, 1.4, -1.1>  look_at<0.0, 0.0, 0.0>  }
> light_source {<6.0, 8.0, -8.0>  color rgb<1.0, 1.0, 1.0>  }
>
> box {
>    <-0.35, -0.35, -0.35>
>    <  0.35,  0.35,  0.35>
>      texture {
>              T_Wood10
>              finish { specular 0.35 roughness 0.05 ambient 0.3 }
>              rotate<-0, 90, 0>
>              translate -y*0.2
>              translate z*3
>          }
> }
> -----------------------------
> My specific wood species has additional radial xylem rays which are moving from
> the center of the cylinder to the boundary bark. With their ellipsoid cross
> section they have a wonderful appearance after cutting like:
>
>
http://de.wikipedia.org/w/index.php?title=Datei:Buche_Holz_1.jpg&filetimestamp=20050814172227
>
> My Question: Do anyone know how to generate those additional radial rays in the
> wood texture?
>
> The wood texture is defined as:
> -----------------------------
> #declare T_Wood10 =
>      texture {  pigment{ P_WoodGrain10A color_map { M_Wood10A }}}
>      texture {  pigment{ P_WoodGrain10B color_map { M_Wood10B }}}
> -----------------------------
> with:
> -----------------------------
> #declare P_WoodGrain10A =
> pigment {
>      wood
>      turbulence 0.02
>   //   turbulence 0.5
>      octaves 4
>      lambda 3
>      scale 0.175
>      //scale<0.3,0.175,0.175>
>      rotate<2, 2, 0>
> }
> #declare P_WoodGrain10B =
> pigment {
>      wood
>      turbulence 0.02
>      octaves 4
>      lambda 2.8
>      scale 0.2
>      //scale<0.3,0.2,0.2>
>      rotate<2, 2, 0>
>      translate<0.0175, 0.0175, 0.0175>
> }
> -----------------------------
>
> For your help many thanks in advance
>
> hearing
>
>
>
>

You can add another layer.
For the added layer, you can use a bozo or leopard pattern unevenly 
scalled. That pattern will be mostly transparent with some darker 
filtering areas.
leopard will give a more regular pattern, while bozo have a random look.
Additionaly, you can apply a cylindrical warp to that layer.

You can also experiment with some other patterns.



Alain

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