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    void laplacian_smooth4(Manifold& m,float weight, int max_iter)
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    void laplacian_smooth4(Manifold& m,float weight, int max_iter)
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    {
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    {
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        auto new_pos = m.positions_attribute_vector();
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        auto new_pos = m.positions_attribute_vector();
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        for(int iter=0;iter<max_iter; ++iter) {
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        for(int iter=0;iter<max_iter; ++iter) {
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            for(auto v : m.vertices())
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            for(VertexID v : m.vertices())
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                if(!boundary(m, v))
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                if(!boundary(m, v))
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                    new_pos[v] = weight*laplacian(m, v)+m.pos(v);
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                    new_pos[v] = weight*laplacian(m, v)+m.pos(v);
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            swap(m.positions_attribute_vector(),new_pos);
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            swap(m.positions_attribute_vector(),new_pos);
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        }
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        }
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    }
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    }
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    inline void laplacian_smooth_vertex(Manifold& m,vector<VertexID>& vids,
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    inline void laplacian_smooth_vertex(Manifold& m,vector<VertexID>& vids,
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                                        VertexAttributeVector<Vec3d>& new_pos,
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                                        VertexAttributeVector<Vec3d>& new_pos,
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                                        float weight){
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                                        float weight){
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        for(auto v: vids)
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        for(VertexID v: vids)
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            new_pos[v] = m.pos(v)+weight*laplacian(m, v);
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            new_pos[v] = m.pos(v)+weight*laplacian(m, v);
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    }
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    }
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    void laplacian_smooth6(Manifold& m, float weight, int max_iter)
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    void laplacian_smooth6(Manifold& m, float weight, int max_iter)
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    {
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    {