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class TGLBoundingBox


TGLBoundingBox

Concrete class describing an orientated (free) or axis aligned box
of 8 verticies. Supports methods for setting aligned or orientated
boxes, find volume, axes, extents, centers, face planes etc.
Also tests for overlap testing of planes and other bounding boxes,
with fast sphere approximation.

Function Members (Methods)

public:

	TGLBoundingBox()
	TGLBoundingBox(const TGLVertex3* vertex)
	TGLBoundingBox(const Double_t** vertex)
	TGLBoundingBox(const TGLBoundingBox& other)
	TGLBoundingBox(const TGLVertex3& lowVertex, const TGLVertex3& highVertex)
virtual	~TGLBoundingBox()
const TGLVector3&	Axis(UInt_t i, Bool_t normalised = kTRUE) const
TGLVertex3	Center() const
static TClass*	Class()
Double_t	Diagonal() const
void	Draw(Bool_t solid = kFALSE) const
void	Dump() const
void	ExpandAligned(const TGLVertex3& point)
TGLVector3	Extents() const
const vector<UInt_t>&	FaceVertices(TGLBoundingBox::EFace face) const
TGLPlane	GetNearPlane() const
virtual TClass*	IsA() const
Bool_t	IsEmpty() const
TGLVertex3	MaxAAVertex() const
void	MergeAligned(const TGLBoundingBox& other)
TGLVertex3	MinAAVertex() const
Int_t	NumVertices() const
TGLBoundingBox&	operator=(const TGLBoundingBox& other)
const TGLVertex3&	operator[](UInt_t index) const
Rgl::EOverlap	Overlap(const TGLPlane& plane) const
Rgl::EOverlap	Overlap(const TGLBoundingBox& box) const
void	PlaneSet(TGLPlaneSet_t& planeSet) const
void	Scale(Double_t factor)
void	Scale(Double_t xFactor, Double_t yFactor, Double_t zFactor)
void	Set(const TGLVertex3* vertex)
void	Set(const Double_t** vertex)
void	Set(const TGLBoundingBox& other)
void	SetAligned(const TGLVertex3& lowVertex, const TGLVertex3& highVertex)
void	SetAligned(UInt_t nbPnts, const Double_t* pnts)
void	SetEmpty()
virtual void	ShowMembers(TMemberInspector&)
virtual void	Streamer(TBuffer&)
void	StreamerNVirtual(TBuffer& ClassDef_StreamerNVirtual_b)
void	Transform(const TGLMatrix& matrix)
void	Translate(const TGLVector3& offset)
const TGLVertex3&	Vertex(UInt_t index) const
const TGLVertex3*	Vertices() const
Double_t	Volume() const
Double_t	XMax() const
Double_t	XMin() const
Double_t	YMax() const
Double_t	YMin() const
Double_t	ZMax() const
Double_t	ZMin() const

private:

Double_t	Max(UInt_t index) const
Double_t	Min(UInt_t index) const
void	UpdateCache()
Bool_t	ValidIndex(UInt_t index) const

Data Members

public:

enum EFace {	kFaceLowX
	kFaceHighX
	kFaceLowY
	kFaceHighY
	kFaceLowZ
	kFaceHighZ
	kFaceCount
};

private:

TGLVector3	fAxes[3]	! box axes in global frame - cached for speed
TGLVector3	fAxesNorm[3]	! normalised box axes in global frame - cached for speed
Double_t	fDiagonal	! max box diagonal - cached for speed
TGLVertex3	fVertex[8]	! the 8 bounding box vertices
Double_t	fVolume	! box volume - cached for speed

Class Charts

Inheritance Inherited Members Includes Libraries

Function documentation

TGLBoundingBox()

 Construct an empty bounding box

TGLBoundingBox(const TGLVertex3 vertex[8])

 Construct a bounding box from provided 8 vertices

TGLBoundingBox(const Double_t vertex[8][3])

 Construct a bounding box from provided 8 vertices

TGLBoundingBox(const TGLVertex3& lowVertex, const TGLVertex3& highVertex)

 Construct an global axis ALIGNED bounding box from provided low/high vertex pair

TGLBoundingBox(const TGLBoundingBox& other)

 Construct a bounding box as copy of existing one

~TGLBoundingBox()

 Destroy bounding box

void UpdateCache()

 Update the internally cached volume and axes vectors - these are retained
 for efficiency - many more reads than modifications

void Set(const TGLVertex3 vertex[8])

 Set a bounding box from provided 8 vertices

void Set(const Double_t vertex[8][3])

 Set a bounding box from provided 8 vertices

void Set(const TGLBoundingBox& other)

 Set a bounding box from vertices of other

void SetEmpty()

 Set bounding box empty - all vertices at (0,0,0)

void SetAligned(const TGLVertex3& lowVertex, const TGLVertex3& highVertex)

 Set ALIGNED box from two low/high vertices. Box axes are aligned with
 global frame axes that vertices are specified in.

void SetAligned(UInt_t nbPnts, const Double_t* pnts)

 Set ALIGNED box from one or more points. Box axes are aligned with
 global frame axes that points are specified in.

void MergeAligned(const TGLBoundingBox& other)

 Expand current bbox so that it includes other's bbox.
 This make the bbox axis-aligned.

void ExpandAligned(const TGLVertex3& point)

 Expand current bbox so that it includes the point.
 This make the bbox axis-aligned.

void Scale(Double_t factor)

 Isotropically scale bounding box along it's LOCAL axes, preserving center

void Scale(Double_t xFactor, Double_t yFactor, Double_t zFactor)

 Asymetrically scale box along it's LOCAL x,y,z axes, preserving center

void Translate(const TGLVector3& offset)

 Translate all vertices by offset

void Transform(const TGLMatrix& matrix)

 Transform all vertices with matrix.

const std::vector<UInt_t> & FaceVertices(TGLBoundingBox::EFace face) const

return a vector of face vertices
    y
    |
    |
    |________x
   /  3-------2
  /  /|      /|
 z  7-------6 |
    | 0-----|-1
    |/      |
    4-------5

void PlaneSet(TGLPlaneSet_t& planeSet) const

 Fill out supplied plane set vector with TGLPlane objects
 representing six faces of box

TGLPlane GetNearPlane() const

 Return the near-plane.

Rgl::EOverlap Overlap(const TGLPlane& plane) const

 Find overlap (Inside, Outside, Partial) of plane c.f. bounding box.

Rgl::EOverlap Overlap(const TGLBoundingBox& box) const

 Find overlap (Inside, Outside, Partial) of other bounding box c.f. us.

void Draw(Bool_t solid = kFALSE) const

 Draw the bounding box as either wireframe (default) of solid
 using current GL color.

Double_t Min(UInt_t index) const

 Find minimum vertex value for axis of index X(0), Y(1), Z(2)

Double_t Max(UInt_t index) const

 Find maximum vertex value for axis of index X(0), Y(1), Z(2)

TGLVertex3 MinAAVertex() const

 Find minimum vertex values.

TGLVertex3 MaxAAVertex() const

 Find maximum vertex values.

void Dump() const

 Output to std::cout the vertices, center and volume of box

const TGLVertex3 & Vertex(UInt_t index) const

const TGLVertex3* Vertices() const

TGLVector3 Extents() const

TGLVertex3 Center() const

const TGLVector3 & Axis(UInt_t i, Bool_t normalised = kTRUE) const

Bool_t IsEmpty() const

Bool_t ValidIndex(UInt_t index) const

{ return (index < 8); }

Double_t XMin() const

{ return Min(0); }

Double_t XMax() const

{ return Max(0); }

Double_t YMin() const

{ return Min(1); }

Double_t YMax() const

{ return Max(1); }

Double_t ZMin() const

{ return Min(2); }

Double_t ZMax() const

{ return Max(2); }

Int_t NumVertices() const

{ return 8; }

Double_t Volume() const

{ return fVolume; }

Double_t Diagonal() const

{ return fDiagonal; }