GrayLib::cHexahedron Class Reference

#include <cHexahedron.h>

Classes
struct	BBOX_INDICES_t

Public Types
typedef float	DVALUE_t
	Dimension value type. More...
typedef UINT	PLANES_MASK_t
	Bit Mask of the 6 planes. More...

Public Member Functions
	cHexahedron () noexcept
	cHexahedron (const cBounds3f &bbox)
PLANES_MASK_t	get_FullPlanesMask () const noexcept
void	UpdateBBoxIndices ()
	need to be called after planes were changed if you want BBox testing More...
bool	GetIntersection (const cBounds3f &box, OUT PLANES_MASK_t *planesMask=nullptr) const
bool	GetIntersection (const cSpheref &sphere, OUT PLANES_MASK_t *planesMask=nullptr) const
template<class TYPE >
GINTERSECT_TYPE	IntersectTest (const TYPE &obj) const
void	TransformCoords (const cMatrix4x4f &m)
	to transform polyhedrons, multiply by transpose of inverse of actual transform More...
void	TransformNormals (const cMatrix4x4f &m)
void	SetNormalized ()
	set coords. More...
void	SetBounds (const cBounds3f &bbox)
void	SetW (const cHexahedron &frustum, const cVector3f &vPos)
void	SetFrustum (const cMatrix4x4f &m, DVALUE_t fUnit=1)
	UNITTEST_FRIEND (cHexahedron)

Static Public Attributes
static const int	k_NUMPLANES = 6
	Hexahedron, Frustum, (maybe cubic?) More...

Protected Attributes
BBOX_INDICES_t	m_BBoxIndices [k_NUMPLANES]
	for fast bbox tests More...
cPlanef	m_aPlanes [k_NUMPLANES]
	represent the bbox as a set of planes. More...

Detailed Description

a six sided 3d object. e.g. Hexahedron, Frustum, cubic. convex polyhedral space, represented as union of half-spaces, each half-space represented as plane

Member Typedef Documentation

DVALUE_t

typedef float GrayLib::cHexahedron::DVALUE_t

Dimension value type.

PLANES_MASK_t

typedef UINT GrayLib::cHexahedron::PLANES_MASK_t

Bit Mask of the 6 planes.

Constructor & Destructor Documentation

cHexahedron() [1/2]

GrayLib::cHexahedron::cHexahedron ( )

inlinenoexcept

cHexahedron() [2/2]

GrayLib::cHexahedron::cHexahedron

(

const cBounds3f &

bbox

)

Member Function Documentation

get_FullPlanesMask()

PLANES_MASK_t GrayLib::cHexahedron::get_FullPlanesMask ( ) const

inlinenoexcept

GetIntersection() [1/2]

bool GrayLib::cHexahedron::GetIntersection	(	const cBounds3f &	box,
		OUT PLANES_MASK_t *	planesMask = nullptr
	)		const

does the bbox intersect the frustum/hexahedron? very fast and 100% precise requires pre-setup indices though (UpdateBBoxIndices)

GetIntersection() [2/2]

bool GrayLib::cHexahedron::GetIntersection	(	const cSpheref &	sphere,
		OUT PLANES_MASK_t *	planesMask = nullptr
	)		const

does the sphere intersect the frustum/hexahedron?

IntersectTest()

template<class TYPE >

GINTERSECT_TYPE GrayLib::cHexahedron::IntersectTest ( const TYPE &  obj ) const

inline

TYPE = cBounds3f, cSpheref

SetBounds()

void GrayLib::cHexahedron::SetBounds

(

const cBounds3f &

bbox

)

SetFrustum()

void GrayLib::cHexahedron::SetFrustum	(	const cMatrix4x4f &	m,
		DVALUE_t	fUnit = 1
	)

this is frustum in projected coords, back transformed to make pyramidal (or cubic) convex polyhedron

• m = projected view of the frustum. fUnit = 1, 0.8f = shrink frustum to test clipping

SetNormalized()

void GrayLib::cHexahedron::SetNormalized ( )

inline

set coords.

usually this is not needed unless you want normalized plane normals all plane checks work perfectly without normalization

SetW()

void GrayLib::cHexahedron::SetW	(	const cHexahedron &	frustum,
		const cVector3f &	vPos
	)

Offset coords.

TransformCoords()

void GrayLib::cHexahedron::TransformCoords ( const cMatrix4x4f &  m )

inline

to transform polyhedrons, multiply by transpose of inverse of actual transform

4x4 mult. SetMul e.g. Make a unit bbox into a camera frustum.

TransformNormals()

void GrayLib::cHexahedron::TransformNormals ( const cMatrix4x4f &  m )

inline

3x3 mult

UNITTEST_FRIEND()

GrayLib::cHexahedron::UNITTEST_FRIEND

(

cHexahedron

)

UpdateBBoxIndices()

void GrayLib::cHexahedron::UpdateBBoxIndices

(

)

need to be called after planes were changed if you want BBox testing

Member Data Documentation

k_NUMPLANES

const int GrayLib::cHexahedron::k_NUMPLANES = 6

static

Hexahedron, Frustum, (maybe cubic?)

m_aPlanes

cPlanef GrayLib::cHexahedron::m_aPlanes[k_NUMPLANES]

protected

represent the bbox as a set of planes.

m_BBoxIndices

BBOX_INDICES_t GrayLib::cHexahedron::m_BBoxIndices[k_NUMPLANES]

protected

for fast bbox tests

---

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

• c:/Dennis/Source/Gray/GrayLib/include/Geometry/cHexahedron.h
• c:/Dennis/Source/Gray/GrayLib/src/Geometry/cHexahedron.cpp