> The same results with difference or intersection of two meshes.

Just as I would expect. difference {A B} does the same as
intersection {A object {B inverse}}. inverse can have no effect on
patch objects such as a mesh, because they have no inside or outside.


-- 
merge{#local i=-11;#while(i<11)#local
i=i+.1;sphere{<i*(i*i*(.05-i*i*(4e-7*i*i+3e-4))-3)10*sin(i)30>.5}#end
pigment{rgbt 1}interior{media{emission x}}hollow}//  Mark Weyer

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