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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 ¢er, 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
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