Wasn't it twinbee who wrote:
>> You can do that with any type of object, just use a pigment function.
>>
>> http://www.econym.demon.co.uk/isotut/pigfun.htm
>
>Many thanks! I'm guessing other attributes such as variable
>translucency or specularity throughout the surface of the material
>can be set as well.

Specularity is tricky. The specular value of any individual texture is 
constant, so if you want to vary the specularity you have to use more 
than one texture combined in a texture map. See the recent "specular 
texture" thread in this group but use a function instead of 
image_pattern to blend them.

-- 
Mike Williams
Gentleman of Leisure

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