I think we are on the verge of version 2.0 of granites21.inc. Thanks to 
your comments important improvements have been made or are pending. So, 
thank you indeed for your comprehensive contributions.

Attached are examples of the latest developments. All the textures have 
been wrapped into material{} with an ior of quartz (1.6) and now include 
a finish with fresnel. The tentative to use the albedo keyword however, 
has been abandoned for the time being as too difficult apparently to use 
in any way. Without being exclusive, thanks to Alain and Maurice, and of 
course the usual suspects Bald Eagle and Kenneth.

In a next stage, the use of more elaborate macros are planned, including 
sslt possibilities for instance. Bald Eagle has proposed a first version 
of such a macro and I am going to study it and see how to integrate 
things. In the same way, Jr proposed a HowTo html file where for 
instance the content of the headers and additional info can be provided. 
Thanks to both of you.

More discussions can and will follow here of course, but a new version 
of the package will be uploaded in a new post in due time.

-- 
Thomas

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