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nurb_circ.dat
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-1 0 
-1 0.5  
0 2     
1 0.5   
1 0 

1 0.66666 0.33333 0.66666 1
0 1 2 


% a semicircle, written as a C^2 NURB with
%two cubic segments over the uniform knot sequence
%0,1,2. First: the 5 control points. Next: their weights.