btPersistentManifold is a contact point cache, it stays persistent as long as objects are overlapping in the broadphase. More...

#include <btPersistentManifold.h>

Inheritance diagram for btPersistentManifold:

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Collaboration diagram for btPersistentManifold:

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Public Member Functions
	BT_DECLARE_ALIGNED_ALLOCATOR ()

	btPersistentManifold ()

	btPersistentManifold (const btCollisionObject body0, const btCollisionObject body1, int, btScalar contactBreakingThreshold, btScalar contactProcessingThreshold)

const btCollisionObject *	getBody0 () const

const btCollisionObject *	getBody1 () const

void	setBodies (const btCollisionObject body0, const btCollisionObject body1)

void	clearUserCache (btManifoldPoint &pt)

int	getNumContacts () const

void	setNumContacts (int cachedPoints)
	the setNumContacts API is usually not used, except when you gather/fill all contacts manually More...

const btManifoldPoint &	getContactPoint (int index) const

btManifoldPoint &	getContactPoint (int index)

btScalar	getContactBreakingThreshold () const

btScalar	getContactProcessingThreshold () const

void	setContactBreakingThreshold (btScalar contactBreakingThreshold)

void	setContactProcessingThreshold (btScalar contactProcessingThreshold)

int	getCacheEntry (const btManifoldPoint &newPoint) const

int	addManifoldPoint (const btManifoldPoint &newPoint, bool isPredictive=false)

void	removeContactPoint (int index)

void	replaceContactPoint (const btManifoldPoint &newPoint, int insertIndex)

bool	validContactDistance (const btManifoldPoint &pt) const

void	refreshContactPoints (const btTransform &trA, const btTransform &trB)
	calculated new worldspace coordinates and depth, and reject points that exceed the collision margin More...

void	clearManifold ()

Public Member Functions inherited from btTypedObject
	btTypedObject (int objectType)

int	getObjectType () const

Public Attributes
int	m_companionIdA

int	m_companionIdB

int	m_index1a

Public Attributes inherited from btTypedObject
int	m_objectType

Private Member Functions
int	sortCachedPoints (const btManifoldPoint &pt)
	sort cached points so most isolated points come first More...

int	findContactPoint (const btManifoldPoint *unUsed, int numUnused, const btManifoldPoint &pt)

Private Attributes
btManifoldPoint	m_pointCache [MANIFOLD_CACHE_SIZE]

const btCollisionObject *	m_body0
	this two body pointers can point to the physics rigidbody class. More...

const btCollisionObject *	m_body1

int	m_cachedPoints

btScalar	m_contactBreakingThreshold

btScalar	m_contactProcessingThreshold

Detailed Description

btPersistentManifold is a contact point cache, it stays persistent as long as objects are overlapping in the broadphase.

Those contact points are created by the collision narrow phase. The cache can be empty, or hold 1,2,3 or 4 points. Some collision algorithms (GJK) might only add one point at a time. updates/refreshes old contact points, and throw them away if necessary (distance becomes too large) reduces the cache to 4 points, when more then 4 points are added, using following rules: the contact point with deepest penetration is always kept, and it tries to maximuze the area covered by the points note that some pairs of objects might have more then one contact manifold.

Definition at line 54 of file btPersistentManifold.h.

Constructor & Destructor Documentation

btPersistentManifold::btPersistentManifold ( )

Definition at line 29 of file btPersistentManifold.cpp.

btPersistentManifold::btPersistentManifold	(	const btCollisionObject *	body0,
		const btCollisionObject *	body1,
		int	,
		btScalar	contactBreakingThreshold,
		btScalar	contactProcessingThreshold
	)

inline

Definition at line 86 of file btPersistentManifold.h.

Member Function Documentation

int btPersistentManifold::addManifoldPoint	(	const btManifoldPoint &	newPoint,
		bool	isPredictive = `false`
	)

Definition at line 208 of file btPersistentManifold.cpp.

btPersistentManifold::BT_DECLARE_ALIGNED_ALLOCATOR ( )

void btPersistentManifold::clearManifold ( )

inline

Definition at line 221 of file btPersistentManifold.h.

void btPersistentManifold::clearUserCache ( btManifoldPoint & pt )

Definition at line 54 of file btPersistentManifold.cpp.

int btPersistentManifold::findContactPoint	(	const btManifoldPoint *	unUsed,
		int	numUnused,
		const btManifoldPoint &	pt
	)

private

const btCollisionObject* btPersistentManifold::getBody0 ( ) const

inline

Definition at line 94 of file btPersistentManifold.h.

const btCollisionObject* btPersistentManifold::getBody1 ( ) const

inline

Definition at line 95 of file btPersistentManifold.h.

int btPersistentManifold::getCacheEntry ( const btManifoldPoint & newPoint ) const

Definition at line 188 of file btPersistentManifold.cpp.

btScalar btPersistentManifold::getContactBreakingThreshold ( ) const

Definition at line 240 of file btPersistentManifold.cpp.

const btManifoldPoint& btPersistentManifold::getContactPoint ( int index ) const

inline

Definition at line 117 of file btPersistentManifold.h.

btManifoldPoint& btPersistentManifold::getContactPoint ( int index )

inline

Definition at line 123 of file btPersistentManifold.h.

btScalar btPersistentManifold::getContactProcessingThreshold ( ) const

inline

Definition at line 132 of file btPersistentManifold.h.

int btPersistentManifold::getNumContacts ( ) const

inline

Definition at line 109 of file btPersistentManifold.h.

void btPersistentManifold::refreshContactPoints	(	const btTransform &	trA,
		const btTransform &	trB
	)

calculated new worldspace coordinates and depth, and reject points that exceed the collision margin

first refresh worldspace positions and distance

then

Definition at line 247 of file btPersistentManifold.cpp.

void btPersistentManifold::removeContactPoint ( int index )

inline

Definition at line 154 of file btPersistentManifold.h.

void btPersistentManifold::replaceContactPoint	(	const btManifoldPoint &	newPoint,
		int	insertIndex
	)

inline

Definition at line 175 of file btPersistentManifold.h.

void btPersistentManifold::setBodies	(	const btCollisionObject *	body0,
		const btCollisionObject *	body1
	)

inline

Definition at line 97 of file btPersistentManifold.h.

void btPersistentManifold::setContactBreakingThreshold ( btScalar contactBreakingThreshold )

inline

Definition at line 137 of file btPersistentManifold.h.

void btPersistentManifold::setContactProcessingThreshold ( btScalar contactProcessingThreshold )

inline

Definition at line 142 of file btPersistentManifold.h.

void btPersistentManifold::setNumContacts ( int cachedPoints )

inline

the setNumContacts API is usually not used, except when you gather/fill all contacts manually

Definition at line 111 of file btPersistentManifold.h.

int btPersistentManifold::sortCachedPoints ( const btManifoldPoint & pt )

private

sort cached points so most isolated points come first

Definition at line 109 of file btPersistentManifold.cpp.

bool btPersistentManifold::validContactDistance ( const btManifoldPoint & pt ) const

inline

Definition at line 213 of file btPersistentManifold.h.

Member Data Documentation

const btCollisionObject* btPersistentManifold::m_body0

private

this two body pointers can point to the physics rigidbody class.

Definition at line 61 of file btPersistentManifold.h.

const btCollisionObject* btPersistentManifold::m_body1

private

Definition at line 62 of file btPersistentManifold.h.

int btPersistentManifold::m_cachedPoints

private

Definition at line 64 of file btPersistentManifold.h.

int btPersistentManifold::m_companionIdA

Definition at line 79 of file btPersistentManifold.h.

int btPersistentManifold::m_companionIdB

Definition at line 80 of file btPersistentManifold.h.

btScalar btPersistentManifold::m_contactBreakingThreshold

private

Definition at line 66 of file btPersistentManifold.h.

btScalar btPersistentManifold::m_contactProcessingThreshold

private

Definition at line 67 of file btPersistentManifold.h.

int btPersistentManifold::m_index1a

Definition at line 82 of file btPersistentManifold.h.

btManifoldPoint btPersistentManifold::m_pointCache[MANIFOLD_CACHE_SIZE]

private

Definition at line 58 of file btPersistentManifold.h.

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

Public Member Functions

Public Attributes

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation