"In all cases, an inside_vector is added to the mesh, so they can be used
in CSG. Additionally, they are completely closed volumes and so will also 
work
as media containers (you will need to add the hollow keyword)."

As far as I know, if a mesh is completely closed, you don't need to specify 
an inside_vector, as the default will work just fine.

cu!
-- 
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x)            // ZK http://www.povplace.com

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