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Ogre::AxisAlignedBox Class Reference

A 3D box aligned with the x/y/z axes. More...

#include <OgreAxisAlignedBox.h>

List of all members.

Public Member Functions

 AxisAlignedBox ()
 AxisAlignedBox (const Vector3 &min, const Vector3 &max)
 AxisAlignedBox (Real mx, Real my, Real mz, Real Mx, Real My, Real Mz)
const Vector3 & getMinimum (void) const
 Gets the minimum corner of the box.

const Vector3 & getMaximum (void) const
 Gets the maximum corner of the box.

void setMinimum (const Vector3 &vec)
 Sets the minimum corner of the box.

void setMinimum (Real x, Real y, Real z)
void setMaximum (const Vector3 &vec)
 Sets the maximum corner of the box.

void setMaximum (Real x, Real y, Real z)
void setExtents (const Vector3 &min, const Vector3 &max)
 Sets both minimum and maximum extents at once.

void setExtents (Real mx, Real my, Real mz, Real Mx, Real My, Real Mz)
const Vector3 * getAllCorners (void) const
 Returns a pointer to an array of 8 corner points, useful for collision vs.

void merge (const AxisAlignedBox &rhs)
 Merges the passed in box into the current box.

void merge (const Vector3 &point)
 Extends the box to encompass the specified point (if needed).

void transform (const Matrix4 &matrix)
 Transforms the box according to the matrix supplied.

void setNull ()
 Sets the box to a 'null' value i.e.

bool isNull (void) const
 Returns true if the box is null i.e.

bool intersects (const AxisAlignedBox &b2) const
 Returns whether or not this box intersects another.

AxisAlignedBox intersection (const AxisAlignedBox &b2) const
 Calculate the area of intersection of this box and another.

Real volume (void) const
 Calculate the volume of this box.

void scale (const Vector3 &s)
 Scales the AABB by the vector given.

bool intersects (const Sphere &s) const
 Tests whether this box intersects a sphere.

bool intersects (const Plane &p) const
 Tests whether this box intersects a plane.

bool intersects (const Vector3 &v) const
 Tests whether the vector point is within this box.

Vector3 getCenter (void) const
 Gets the centre of the box.


Protected Member Functions

void updateCorners (void)
 Internal method for updating corner points.


Protected Attributes

Vector3 mMinimum
Vector3 mMaximum
bool mNull
Vector3 mCorners [8]

Friends

std::ostream & operator<< (std::ostream &o, AxisAlignedBox aab)

Detailed Description

A 3D box aligned with the x/y/z axes.

Remarks:
This class represents a simple box which is aligned with the axes. Internally it only stores 2 points as the extremeties of the box, one which is the minima of all 3 axes, and the other which is the maxima of all 3 axes. This class is typically used for an axis-aligned bounding box (AABB) for collision and visibility determination.

Definition at line 45 of file OgreAxisAlignedBox.h.

Constructor & Destructor Documentation

Ogre::AxisAlignedBox::AxisAlignedBox (   ) 
 

Definition at line 75 of file OgreAxisAlignedBox.h.

Ogre::AxisAlignedBox::AxisAlignedBox (  const Vector3 &  min,
const Vector3 &  max
) 
 

Definition at line 83 of file OgreAxisAlignedBox.h.

Ogre::AxisAlignedBox::AxisAlignedBox (  Real  mx,
Real  my,
Real  mz,
Real  Mx,
Real  My,
Real  Mz
) 
 

Definition at line 88 of file OgreAxisAlignedBox.h.

References Ogre::Real.

Member Function Documentation

const Vector3* Ogre::AxisAlignedBox::getAllCorners (  void   )  const
 

Returns a pointer to an array of 8 corner points, useful for collision vs.

non-aligned objects.

Remarks:
If the order of these corners is important, they are as follows: The 4 points of the minimum Z face (note that because Ogre uses right-handed coordinates, the minimum Z is at the 'back' of the box) starting with the minimum point of all, then anticlockwise around this face (if you are looking onto the face from outside the box). Then the 4 points of the maximum Z face, starting with maximum point of all, then anticlockwise around this face (looking onto the face from outside the box). Like this: 

			       1-----2
			      /|    /|
			     / |   / |
			    5-----4  |
			    |  0--|--3
			    | /   | /
			    |/    |/
			    6-----7

Definition at line 195 of file OgreAxisAlignedBox.h.

Referenced by Ogre::PlaneBoundedVolume::intersects().

Vector3 Ogre::AxisAlignedBox::getCenter (  void   )  const
 

Gets the centre of the box.

Definition at line 427 of file OgreAxisAlignedBox.h.

const Vector3& Ogre::AxisAlignedBox::getMaximum (  void   )  const
 

Gets the maximum corner of the box.

Definition at line 104 of file OgreAxisAlignedBox.h.

Referenced by intersection().

const Vector3& Ogre::AxisAlignedBox::getMinimum (  void   )  const
 

Gets the minimum corner of the box.

Definition at line 97 of file OgreAxisAlignedBox.h.

Referenced by intersection().

AxisAlignedBox Ogre::AxisAlignedBox::intersection (  const AxisAlignedBox &  b2  )  const
 

Calculate the area of intersection of this box and another.

Definition at line 344 of file OgreAxisAlignedBox.h.

References getMaximum(), getMinimum(), Ogre::Vector3::x, Ogre::Vector3::y, and Ogre::Vector3::z.

bool Ogre::AxisAlignedBox::intersects (  const Vector3 &  v  )  const
 

Tests whether the vector point is within this box.

Definition at line 420 of file OgreAxisAlignedBox.h.

References Ogre::Vector3::x, Ogre::Vector3::y, and Ogre::Vector3::z.

bool Ogre::AxisAlignedBox::intersects (  const Plane &  p  )  const
 

Tests whether this box intersects a plane.

Definition at line 415 of file OgreAxisAlignedBox.h.

bool Ogre::AxisAlignedBox::intersects (  const Sphere &  s  )  const
 

Tests whether this box intersects a sphere.

Definition at line 410 of file OgreAxisAlignedBox.h.

bool Ogre::AxisAlignedBox::intersects (  const AxisAlignedBox &  b2  )  const
 

Returns whether or not this box intersects another.

Definition at line 317 of file OgreAxisAlignedBox.h.

References isNull(), mMaximum, mMinimum, Ogre::Vector3::x, Ogre::Vector3::y, and Ogre::Vector3::z.

bool Ogre::AxisAlignedBox::isNull (  void   )  const
 

Returns true if the box is null i.e.

empty.

Definition at line 311 of file OgreAxisAlignedBox.h.

Referenced by Ogre::PlaneBoundedVolume::intersects(), and intersects().

void Ogre::AxisAlignedBox::merge (  const Vector3 &  point  ) 
 

Extends the box to encompass the specified point (if needed).

Definition at line 248 of file OgreAxisAlignedBox.h.

void Ogre::AxisAlignedBox::merge (  const AxisAlignedBox &  rhs  ) 
 

Merges the passed in box into the current box.

The result is the box which encompasses both.

Definition at line 221 of file OgreAxisAlignedBox.h.

References Ogre::Vector3::makeCeil(), Ogre::Vector3::makeFloor(), mMaximum, mMinimum, and mNull.

void Ogre::AxisAlignedBox::scale (  const Vector3 &  s  ) 
 

Scales the AABB by the vector given.

Definition at line 401 of file OgreAxisAlignedBox.h.

void Ogre::AxisAlignedBox::setExtents (  Real  mx,
Real  my,
Real  mz,
Real  Mx,
Real  My,
Real  Mz
) 
 

Definition at line 155 of file OgreAxisAlignedBox.h.

References Ogre::Real.

void Ogre::AxisAlignedBox::setExtents (  const Vector3 &  min,
const Vector3 &  max
) 
 

Sets both minimum and maximum extents at once.

Definition at line 147 of file OgreAxisAlignedBox.h.

void Ogre::AxisAlignedBox::setMaximum (  Real  x,
Real  y,
Real  z
) 
 

Definition at line 136 of file OgreAxisAlignedBox.h.

References Ogre::Real.

void Ogre::AxisAlignedBox::setMaximum (  const Vector3 &  vec  ) 
 

Sets the maximum corner of the box.

Definition at line 129 of file OgreAxisAlignedBox.h.

void Ogre::AxisAlignedBox::setMinimum (  Real  x,
Real  y,
Real  z
) 
 

Definition at line 118 of file OgreAxisAlignedBox.h.

References Ogre::Real.

void Ogre::AxisAlignedBox::setMinimum (  const Vector3 &  vec  ) 
 

Sets the minimum corner of the box.

Definition at line 111 of file OgreAxisAlignedBox.h.

void Ogre::AxisAlignedBox::setNull (   ) 
 

Sets the box to a 'null' value i.e.

not a box.

Definition at line 304 of file OgreAxisAlignedBox.h.

void Ogre::AxisAlignedBox::transform (  const Matrix4 &  matrix  ) 
 

Transforms the box according to the matrix supplied.

Remarks:
By calling this method you get the axis-aligned box which surrounds the transformed version of this box. Therefore each corner of the box is transformed by the matrix, then the extents are mapped back onto the axes to produce another AABB. Useful when you have a local AABB for an object which is then transformed.

Definition at line 268 of file OgreAxisAlignedBox.h.

References Ogre::Vector3::x, Ogre::Vector3::y, and Ogre::Vector3::z.

void Ogre::AxisAlignedBox::updateCorners (  void   )  [protected]
 

Internal method for updating corner points.

Definition at line 56 of file OgreAxisAlignedBox.h.

Real Ogre::AxisAlignedBox::volume (  void   )  const
 

Calculate the volume of this box.

Definition at line 386 of file OgreAxisAlignedBox.h.

References Ogre::Real, Ogre::Vector3::x, Ogre::Vector3::y, and Ogre::Vector3::z.

Friends And Related Function Documentation

std::ostream& operator<< (  std::ostream &  o,
AxisAlignedBox  aab
)  [friend]
 

Definition at line 201 of file OgreAxisAlignedBox.h.

Member Data Documentation

Vector3 Ogre::AxisAlignedBox::mCorners[8] [protected]
 

Definition at line 52 of file OgreAxisAlignedBox.h.

Vector3 Ogre::AxisAlignedBox::mMaximum [protected]
 

Definition at line 49 of file OgreAxisAlignedBox.h.

Referenced by intersects(), and merge().

Vector3 Ogre::AxisAlignedBox::mMinimum [protected]
 

Definition at line 48 of file OgreAxisAlignedBox.h.

Referenced by intersects(), and merge().

bool Ogre::AxisAlignedBox::mNull [protected]
 

Definition at line 50 of file OgreAxisAlignedBox.h.

Referenced by merge().

The documentation for this class was generated from the following file:

Copyright © 2000-2005 by The OGRE Team
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This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Sun Mar 12 14:38:07 2006