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diff --git a/thirdparty/thekla_atlas/nvmesh/MeshTopology.h b/thirdparty/thekla_atlas/nvmesh/MeshTopology.h
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+++ b/thirdparty/thekla_atlas/nvmesh/MeshTopology.h
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+// This code is in the public domain -- castanyo@yahoo.es
+
+#pragma once
+#ifndef NV_MESH_MESHTOPOLOGY_H
+#define NV_MESH_MESHTOPOLOGY_H
+
+#include <nvmesh/nvmesh.h>
+
+namespace nv
+{
+    namespace HalfEdge { class Mesh; }
+    class MeshAdjacency;
+
+    /// Mesh topology information.
+    class MeshTopology
+    {
+    public:
+        MeshTopology(const HalfEdge::Mesh * mesh) { buildTopologyInfo(mesh); }
+
+        /// Determine if the mesh is connected.
+        bool isConnected() const { return m_connectedCount == 1; }
+
+        /// Determine if the mesh is closed. (Each edge is shared by two faces)
+        bool isClosed() const { return m_boundaryCount == 0; }
+
+        /// Return true if the mesh has the topology of a disk.
+        bool isDisk() const { return isConnected() && m_boundaryCount == 1/* && m_eulerNumber == 1*/; }
+
+        /// Return the number of connected components.
+        int connectedCount() const { return m_connectedCount; }
+
+        /// Return the number of open holes.
+        int holeCount() const { return m_boundaryCount; }
+
+        /// Return the genus of the mesh.
+        int genus() const { return m_genus; }
+
+        /// Return the euler number of the mesh.
+        int euler() const { return m_eulerNumber; }
+
+
+        static bool isQuadOnly(const HalfEdge::Mesh * mesh);
+
+
+    private:
+
+        NVMESH_API void buildTopologyInfo(const HalfEdge::Mesh * mesh);
+
+    private:
+
+        ///< Number of boundary loops.
+        int m_boundaryCount;		
+
+        ///< Number of connected components.
+        int m_connectedCount;		
+
+        ///< Euler number.
+        int m_eulerNumber;
+
+        /// Mesh genus.
+        int m_genus;
+    };
+
+} // nv namespace
+
+#endif // NV_MESH_MESHTOPOLOGY_H