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beam.k=[-1,0];
beam.origin=[2,0.5];
beam.face=NA;
face1.vertex1=[-1,0];
face1.vertex2=[1,0];
face1.n_right = 1;
face1.n_left= 1.5;
face2.vertex1=[1,0];
face2.vertex2=[0,1];
face2.n_right = 1;
face2.n_left= 1.5;
face3.vertex1=[0,1];
face3.vertex2=[-1,0];
face3.n_right = 1;
face3.n_left= 1.5;
faces={face1,face2,face3};
border1.vertex1=[-5,-5];
border1.vertex2=[5,-5];
border1.n_right = 1.;
border1.n_left= 1;
border2.vertex1=[5,-5];
border2.vertex2=[5,5];
border2.n_right = 1.;
border2.n_left= 1;
border3.vertex1=[5,5];
border3.vertex2=[-5,5];
border3.n_right = 1.;
border3.n_left= 1;
border4.vertex1=[-5,5];
border4.vertex2=[-5,-5];
border4.n_right = 1.;
border4.n_left= 1;
borders={border1,border2, border3, border4};
beams={beam};
beam_trace(beams, faces, borders )
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