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diff --git a/thirdparty/thekla_atlas/nvmesh/TriMesh.h b/thirdparty/thekla_atlas/nvmesh/TriMesh.h
new file mode 100644
index 0000000000..bc5672c1ac
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+++ b/thirdparty/thekla_atlas/nvmesh/TriMesh.h
@@ -0,0 +1,51 @@
+// This code is in the public domain -- Ignacio Castaño <castano@gmail.com>
+
+#pragma once
+#ifndef NV_MESH_TRIMESH_H
+#define NV_MESH_TRIMESH_H
+
+#include "nvcore/Array.h"
+#include "nvmath/Vector.inl"
+#include "nvmesh/nvmesh.h"
+#include "nvmesh/BaseMesh.h"
+
+namespace nv
+{
+    /// Triangle mesh.
+    class TriMesh : public BaseMesh
+    {
+    public:
+        struct Face;
+        typedef BaseMesh::Vertex Vertex;
+
+        TriMesh(uint faceCount, uint vertexCount) : BaseMesh(vertexCount), m_faceArray(faceCount) {}
+
+        // Face methods.
+        uint faceCount() const { return m_faceArray.count(); }
+        const Face & faceAt(uint i) const { return m_faceArray[i]; }
+        Face & faceAt(uint i) { return m_faceArray[i]; }
+        const Array<Face> & faces() const { return m_faceArray; }
+        Array<Face> & faces() { return m_faceArray; }
+
+        NVMESH_API Vector3 faceNormal(uint f) const;
+        NVMESH_API const Vertex & faceVertex(uint f, uint v) const;
+
+        friend Stream & operator<< (Stream & s, BaseMesh & obj);
+
+    private:
+
+        Array<Face> m_faceArray;
+
+    };
+
+
+    /// TriMesh face.
+    struct TriMesh::Face
+    {
+        uint id;
+        uint v[3];
+    };
+
+} // nv namespace
+
+#endif // NV_MESH_TRIMESH_H