1 files changed, 70 insertions, 0 deletions
diff --git a/thirdparty/thekla_atlas/nvmesh/halfedge/Edge.h b/thirdparty/thekla_atlas/nvmesh/halfedge/Edge.h
new file mode 100644
index 0000000000..25c47f4860
--- /dev/null
+++ b/thirdparty/thekla_atlas/nvmesh/halfedge/Edge.h
@@ -0,0 +1,70 @@
+// This code is in the public domain -- castanyo@yahoo.es
+
+#pragma once
+#ifndef NV_MESH_HALFEDGE_EDGE_H
+#define NV_MESH_HALFEDGE_EDGE_H
+
+#include "nvmath/Vector.h"
+
+namespace nv
+{
+    namespace HalfEdge { class Vertex; class Face; class Edge; }
+
+    /// Half edge edge. 
+    class HalfEdge::Edge
+    {
+        NV_FORBID_COPY(Edge);
+    public:
+
+        uint id;
+
+        Edge * next;
+        Edge * prev;	// This is not strictly half-edge, but makes algorithms easier and faster.
+        Edge * pair;
+        Vertex * vertex;
+        Face * face;
+
+
+        // Default constructor.
+        Edge(uint id) : id(id), next(NULL), prev(NULL), pair(NULL), vertex(NULL), face(NULL)
+        {
+        }
+
+
+        // Vertex queries.
+        const Vertex * from() const { return vertex; }
+        Vertex * from() { return vertex; }
+
+        const Vertex * to() const { return pair->vertex; }  // This used to be 'next->vertex', but that changed often when the connectivity of the mesh changes.
+        Vertex * to() { return pair->vertex; }
+
+
+        // Edge queries.
+        void setNext(Edge * e) { next = e; if (e != NULL) e->prev = this; }
+        void setPrev(Edge * e) { prev = e; if (e != NULL) e->next = this; }
+
+        // @@ Add these helpers:
+        //Edge * nextBoundary();
+        //Edge * prevBoundary();
+
+
+        // @@ It would be more simple to only check m_pair == NULL
+        // Face queries.
+        bool isBoundary() const { return !(face && pair->face); }
+
+        // @@ This is not exactly accurate, we should compare the texture coordinates...
+        bool isSeam() const { return vertex != pair->next->vertex || next->vertex != pair->vertex; }
+
+        bool isValid() const;
+
+        // Geometric queries.
+        Vector3 midPoint() const;
+        float length() const;
+        float angle() const;
+
+    };
+
+} // nv namespace
+
+
+#endif // NV_MESH_HALFEDGE_EDGE_H