I believe I'm doing what you're saying... the problem is that I can't 
use neither reflection nor specular settings for the finish, as these 
act on the whole patch, even those areas that are transparent... I don't 
know if there is an easy workaround for this.

Or perhaps there is a way to give values to the specular using an image map?

Fernando

Jim Charter wrote:
> Fernando G. del Cueto wrote:
> 
>> Thanks Jim.
>>
>> The problem with the leaf is that I'm using a bicubic patch with an 
>> image/bump map of the leaf on it, with alpha channel for transparency. 
>> When I put some positive specular, the whole square patch shows up...
>>
>> Therefore I think I need to make it look more decayed perhaps...
>>
>> Fernando
>>
>>
>>
>> Jim Charter wrote:
>>
>>> Fernando G. del Cueto wrote:
>>>
>>> Very nice.  Yes cobble stones tug at me too. These are great.  Maybe 
>>> it's the finish on the leaf that doesn't quite read for me?  Perhaps 
>>> either a little more gloss ormore apparent decay?  Go one direction 
>>> or the other?
> 
> No you can do what you want you need to use the image_pattern with a b/w 
>  profile or mask of the leaf as the image source.  You make two textures 
> which duplicate the pigment and bump references but which differ in 
> finish and transparency.

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