First of all thanks a lot,

> couple of things:
> probably don't need ambient 0.3 in finish try 0 for now, and the wood
> texture is scaled too big by default for your object. comment out the
> three transforms after finish statment to get your bearings (wood
> textures have the long grain going in the z direction) ... using:
>
> texture {
>  T_Wood10
>  finish { specular 0.5 roughness 1e-3 ambient 0 }
>  pigment {
>   ....
>   }
>  scale 0.5
>  }

the transformations are only to be a little bit excentric to have a better view
on the cutting planes where the additional wood rays should appear. But isn't
necessary at this level, of course...

>
> now you should see the circular wood grain facing you ... make more
> sense now?

s. above

> also to try using a color_map to better show the effects of the pigment
> pattern that you're overlaying onto the wood texture: Hint at first try
> some obvious colors (Red, Green) while figuring out how you want it to
> be positioned ie:
>
> pigment {
>  leopard
>  ...
>  color_map {
>   [0.0 Red]
>   [0.5 Red]
>   [0.5 Green]
>   [1.0 Green]
>   }
>  }

Of course, thanks - scale and colors work fine together,
but its still not random enough in the following test:
texture {
            T_Wood10
            finish { specular 0.5 roughness 1e-3 ambient 0.0 }
           // rotate <-0, 90, 0>
           // translate -y*0.2
           // translate z*3
            pigment {
                        leopard
                        //bozo
                        color_map {
                  [0.0 Red]
                  [0.5 Red]
                  [0.5 Green]
                  [1.0 Green]
                  }
                        frequency 0.6 // <-add this line
                        scale <0.0, 10.0, 40.0>
                        turbulence 0.05
                      }
             scale 0.025
                }

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