Perhaps a better solution, to avoid both namespace collisions and 
automatic name mangling, would be to add a new object type, the 
'container'.  It would work something like this:

#declare stuff = container;
#declare stuff.x = 5;
#declare stuff.loc = <3,4,6>;
#declare stuff.ball = sphere {0,1}

Basically, the container acts as a namespace on its own.  Each include 
file could use a container for its variables and declarations, except 
for those it needs exported globally.

...Chambers

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