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+/*
+ This file is part of the MinGfx Project.
+ 
+ Copyright (c) 2017,2018 Regents of the University of Minnesota.
+ All Rights Reserved.
+ 
+ Original Author(s) of this File:
+	David Schroeder, 2010-ish, University of Minnesota
+	
+ Author(s) of Significant Updates/Modifications to the File:
+    Dan Keefe, 2018, University of Minnesota
+	...
+ */
+
+#ifndef SRC_AABB_H_
+#define SRC_AABB_H_
+
+#include "point3.h"
+#include "vector3.h"
+
+namespace mingfx {
+
+// forward declaration
+class Mesh;
+    
+/** A 3D axis-aligned bounding box defined by two corners (min and max).  AABBs
+ can be added together using the + operator to make them grow to cover the 
+ extents of both boxes.  Each box can also store a user_id (int), which can be 
+ used to associate the box with some other object in your program.
+ */
+class AABB {
+public:
+    /// Creates an empty box.
+    AABB();
+    
+    /// Box that contains a single point
+    AABB(const Point3 &a);
+    
+    /// Box that contains a triangle defined by 3 points
+    AABB(const Point3 &a, const Point3 &b, const Point3 &c);
+    
+    /// Box centered at the origin with width, height, and depth specified by
+    /// the vector.
+    AABB(const Vector3 &extents);
+
+    /// Box centered at the center with width, height, and depth specified by
+    /// the vector.
+    AABB(const Point3 &center, const Vector3 &extents);
+    
+    /// Box that contains a whole mesh
+    AABB(const Mesh &mesh);
+
+    /// Box that contains just triangle number "tri_id" from the specified mesh.
+    AABB(const Mesh &mesh, unsigned int tri_id);
+    
+    virtual ~AABB();
+    
+    /// Returns the dimensions of the box in x, y, and z as a 3D vector.
+    Vector3 Dimensions() const;
+    
+    /// Returns the volume of the box or -1.0 when empty and 0.0 if the box
+    /// contains just a single point.
+    float Volume() const;
+    
+    /// Returns the coordinates for the minimum corner of the box.
+    Point3 min() const;
+    
+    /// Returns the coordinates for the maximum corner of the box.
+    Point3 max() const;
+    
+    /// You can set this to whatever you want in order to use it as a handle
+    /// into your own program.  The intent is to make it possible for you to
+    /// associate this AABB with the id of some object in your application.
+    void set_user_data(int data);
+
+    /// You can set this to whatever you want in order to use it as a handle
+    /// into your own program.  The intent is to make it possible for you to
+    /// associate this AABB with the id of some object in your application.
+    int user_data();
+
+private:
+    
+    Point3 min_, max_;
+    
+    int user_data_;
+    
+    friend AABB operator+(const AABB &A, const AABB &B);
+};
+
+// Returns an AABB that contains both A and B completely (kind of like a union)
+AABB operator+(const AABB &A, const AABB &B);
+
+    
+} // end namespace
+
+#endif