Thomas de Groot wrote:

> Interesting. I knew this of course for variables, but I had never realized 
> that it applied also to more complex pigment codes.

Ah, but everything you #declare is a variable. The value
of the variable P_Cloth just happens to be a pigment. There's
nothing special about this variable ...

Dave Blandston wrote:

 > The restriction would be that once "P_Cloth" is defined as a
 > pigment it must remain a pigment.

... which is why this is also incorrect. Feel free
to follow it up with

#declare P_Cloth = 5;

or

#declare P_Cloth = sphere {0,1}

or even

#declare P_Cloth = sphere {0,1 pigment {P_Cloth}}

The reason you can use P_Cloth to define P_Cloth is that
the right hand side of an assignment is processed first,
then the result is assigned to the left hand side.

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