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        }
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        }
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        Vec3d norm(0);
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        Vec3d norm(0);
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        N = one_ring.size();
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        N = one_ring.size();
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        Vec3d p0 = m.pos(v);
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        Vec3d p0 = m.pos(v);
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        for(int i = 0; i < N; ++i){
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        for(size_t i = 0; i < N; ++i){
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            Vec3d p1 = one_ring[i];
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            Vec3d p1 = one_ring[i];
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            Vec3d p2 = one_ring[(i+1) % N];
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            Vec3d p2 = one_ring[(i+1) % N];
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            Vec3d e0 = normalize(p1 - p0);
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            Vec3d e0 = normalize(p1 - p0);
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            Vec3d e1 = normalize(p2 - p0);
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            Vec3d e1 = normalize(p2 - p0);
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            norm += cross(e0, e1) * acos(dot(e0, e1));
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            norm += cross(e0, e1) * acos(dot(e0, e1));