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void LoadMesh(const vector<MeshNodeData>&,const vector<MeshTriData>&);
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void moveNode(int,const Vec3&);
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void translateBy(const Vec3 &translation);
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triangle_iterator triangles_begin(){return m_triangles.begin();};
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triangle_iterator triangles_end(){return m_triangles.end();};
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edge_iterator edges_begin(){return m_edges.begin();};