SliderConstraint Class Reference

A slider constraint allows movement in only 1 axis (and no rotation). Also known as a prismatic constraint. More...

#include <SliderConstraint.h>

Inheritance diagram for SliderConstraint:

Public Member Functions
JPH_OVERRIDE_NEW_DELETE	SliderConstraint (Body &inBody1, Body &inBody2, const SliderConstraintSettings &inSettings)
	Construct slider constraint.
virtual EConstraintSubType	GetSubType () const override
	Get the sub type of a constraint.
virtual void	NotifyShapeChanged (const BodyID &inBodyID, Vec3Arg inDeltaCOM) override
virtual void	SetupVelocityConstraint (float inDeltaTime) override
virtual void	ResetWarmStart () override
virtual void	WarmStartVelocityConstraint (float inWarmStartImpulseRatio) override
virtual bool	SolveVelocityConstraint (float inDeltaTime) override
virtual bool	SolvePositionConstraint (float inDeltaTime, float inBaumgarte) override
virtual void	DrawConstraint (DebugRenderer *inRenderer) const override
virtual void	DrawConstraintLimits (DebugRenderer *inRenderer) const override
virtual void	SaveState (StateRecorder &inStream) const override
	Saving state for replay.
virtual void	RestoreState (StateRecorder &inStream) override
	Restoring state for replay.
virtual Ref< ConstraintSettings >	GetConstraintSettings () const override
	Debug function to convert a constraint to its settings, note that this will not save to which bodies the constraint is connected to.
virtual Mat44	GetConstraintToBody1Matrix () const override
	Calculates the transform that transforms from constraint space to body 1 space. The first column of the matrix is the primary constraint axis (e.g. the hinge axis / slider direction), second column the secondary etc.
virtual Mat44	GetConstraintToBody2Matrix () const override
	Calculates the transform that transforms from constraint space to body 2 space. The first column of the matrix is the primary constraint axis (e.g. the hinge axis / slider direction), second column the secondary etc.
float	GetCurrentPosition () const
	Get the current distance from the rest position.
void	SetMaxFrictionForce (float inFrictionForce)
	Friction control.
float	GetMaxFrictionForce () const
MotorSettings &	GetMotorSettings ()
	Motor settings.
const MotorSettings &	GetMotorSettings () const
void	SetMotorState (EMotorState inState)
EMotorState	GetMotorState () const
void	SetTargetVelocity (float inVelocity)
float	GetTargetVelocity () const
void	SetTargetPosition (float inPosition)
float	GetTargetPosition () const
void	SetLimits (float inLimitsMin, float inLimitsMax)
	Update the limits of the slider constraint (see SliderConstraintSettings)
float	GetLimitsMin () const
float	GetLimitsMax () const
bool	HasLimits () const
const SpringSettings &	GetLimitsSpringSettings () const
	Update the limits spring settings.
SpringSettings &	GetLimitsSpringSettings ()
void	SetLimitsSpringSettings (const SpringSettings &inLimitsSpringSettings)
Public Member Functions inherited from TwoBodyConstraint
JPH_OVERRIDE_NEW_DELETE	TwoBodyConstraint (Body &inBody1, Body &inBody2, const TwoBodyConstraintSettings &inSettings)
	Constructor.
virtual EConstraintType	GetType () const override
	Get the type of a constraint.
virtual bool	IsActive () const override
	Solver interface.
virtual void	DrawConstraintReferenceFrame (DebugRenderer *inRenderer) const override
Body *	GetBody1 () const
	Access to the connected bodies.
Body *	GetBody2 () const
virtual void	BuildIslands (uint32 inConstraintIndex, IslandBuilder &ioBuilder, BodyManager &inBodyManager) override
	Link bodies that are connected by this constraint in the island builder.
virtual uint	BuildIslandSplits (LargeIslandSplitter &ioSplitter) const override
	Link bodies that are connected by this constraint in the same split. Returns the split index.
Public Member Functions inherited from Constraint
JPH_OVERRIDE_NEW_DELETE	Constraint (const ConstraintSettings &inSettings)
	Constructor.
virtual	~Constraint ()=default
	Virtual destructor.
uint32	GetConstraintPriority () const
void	SetConstraintPriority (uint32 inPriority)
void	SetNumVelocityStepsOverride (uint inN)
	Used only when the constraint is active. Override for the number of solver velocity iterations to run, 0 means use the default in PhysicsSettings::mNumVelocitySteps. The number of iterations to use is the max of all contacts and constraints in the island.
uint	GetNumVelocityStepsOverride () const
void	SetNumPositionStepsOverride (uint inN)
	Used only when the constraint is active. Override for the number of solver position iterations to run, 0 means use the default in PhysicsSettings::mNumPositionSteps. The number of iterations to use is the max of all contacts and constraints in the island.
uint	GetNumPositionStepsOverride () const
void	SetEnabled (bool inEnabled)
bool	GetEnabled () const
	Test if a constraint is enabled.
uint64	GetUserData () const
	Access to the user data, can be used for anything by the application.
void	SetUserData (uint64 inUserData)
float	GetDrawConstraintSize () const
	Size of constraint when drawing it through the debug renderer.
void	SetDrawConstraintSize (float inSize)
Public Member Functions inherited from RefTarget< Constraint >
	RefTarget ()=default
	Constructor.
	RefTarget (const RefTarget &)
	~RefTarget ()
	assert no one is referencing us
void	SetEmbedded () const
RefTarget &	operator= (const RefTarget &)
	Assignment operator.
uint32	GetRefCount () const
	Get current refcount of this object.
void	AddRef () const
	Add or release a reference to this object.
void	Release () const
Public Member Functions inherited from NonCopyable
	NonCopyable ()=default
	NonCopyable (const NonCopyable &)=delete
void	operator= (const NonCopyable &)=delete

Get Lagrange multiplier from last physics update (the linear/angular impulse applied to satisfy the constraint)
Vector< 2 >	GetTotalLambdaPosition () const
float	GetTotalLambdaPositionLimits () const
Vec3	GetTotalLambdaRotation () const
float	GetTotalLambdaMotor () const

Additional Inherited Members
Static Public Member Functions inherited from RefTarget< Constraint >
static int	sInternalGetRefCountOffset ()
	INTERNAL HELPER FUNCTION USED BY SERIALIZATION.
Protected Member Functions inherited from Constraint
void	ToConstraintSettings (ConstraintSettings &outSettings) const
	Helper function to copy settings back to constraint settings for this base class.
Protected Attributes inherited from TwoBodyConstraint
Body *	mBody1
	The two bodies involved.
Body *	mBody2
Protected Attributes inherited from Constraint
float	mDrawConstraintSize
	Size of constraint when drawing it through the debug renderer.
Protected Attributes inherited from RefTarget< Constraint >
atomic< uint32 >	mRefCount
	Current reference count.
Static Protected Attributes inherited from RefTarget< Constraint >
static constexpr uint32	cEmbedded
	A large value that gets added to the refcount to mark the object as embedded.

Detailed Description

A slider constraint allows movement in only 1 axis (and no rotation). Also known as a prismatic constraint.

Constructor & Destructor Documentation

SliderConstraint()

SliderConstraint::SliderConstraint	(	Body &	inBody1,
		Body &	inBody2,
		const SliderConstraintSettings &	inSettings
	)

Construct slider constraint.

Member Function Documentation

DrawConstraint()

void SliderConstraint::DrawConstraint ( DebugRenderer *  inRenderer ) const

overridevirtual

Implements Constraint.

DrawConstraintLimits()

void SliderConstraint::DrawConstraintLimits ( DebugRenderer *  inRenderer ) const

overridevirtual

Reimplemented from Constraint.

GetConstraintSettings()

Ref< ConstraintSettings > SliderConstraint::GetConstraintSettings ( ) const

overridevirtual

Debug function to convert a constraint to its settings, note that this will not save to which bodies the constraint is connected to.

Implements Constraint.

GetConstraintToBody1Matrix()

Mat44 SliderConstraint::GetConstraintToBody1Matrix ( ) const

overridevirtual

Calculates the transform that transforms from constraint space to body 1 space. The first column of the matrix is the primary constraint axis (e.g. the hinge axis / slider direction), second column the secondary etc.

Implements TwoBodyConstraint.

GetConstraintToBody2Matrix()

Mat44 SliderConstraint::GetConstraintToBody2Matrix ( ) const

overridevirtual

Calculates the transform that transforms from constraint space to body 2 space. The first column of the matrix is the primary constraint axis (e.g. the hinge axis / slider direction), second column the secondary etc.

Implements TwoBodyConstraint.

GetCurrentPosition()

float SliderConstraint::GetCurrentPosition

(

)

const

Get the current distance from the rest position.

GetLimitsMax()

float SliderConstraint::GetLimitsMax ( ) const

inline

GetLimitsMin()

float SliderConstraint::GetLimitsMin ( ) const

inline

GetLimitsSpringSettings() [1/2]

SpringSettings & SliderConstraint::GetLimitsSpringSettings ( )

inline

GetLimitsSpringSettings() [2/2]

const SpringSettings & SliderConstraint::GetLimitsSpringSettings ( ) const

inline

Update the limits spring settings.

GetMaxFrictionForce()

float SliderConstraint::GetMaxFrictionForce ( ) const

inline

GetMotorSettings() [1/2]

MotorSettings & SliderConstraint::GetMotorSettings ( )

inline

Motor settings.

GetMotorSettings() [2/2]

const MotorSettings & SliderConstraint::GetMotorSettings ( ) const

inline

GetMotorState()

EMotorState SliderConstraint::GetMotorState ( ) const

inline

GetSubType()

virtual EConstraintSubType SliderConstraint::GetSubType ( ) const

inlineoverridevirtual

Get the sub type of a constraint.

Implements Constraint.

GetTargetPosition()

float SliderConstraint::GetTargetPosition ( ) const

inline

GetTargetVelocity()

float SliderConstraint::GetTargetVelocity ( ) const

inline

GetTotalLambdaMotor()

float SliderConstraint::GetTotalLambdaMotor ( ) const

inline

GetTotalLambdaPosition()

Vector< 2 > SliderConstraint::GetTotalLambdaPosition ( ) const

inline

GetTotalLambdaPositionLimits()

float SliderConstraint::GetTotalLambdaPositionLimits ( ) const

inline

GetTotalLambdaRotation()

Vec3 SliderConstraint::GetTotalLambdaRotation ( ) const

inline

HasLimits()

bool SliderConstraint::HasLimits ( ) const

inline

NotifyShapeChanged()

void SliderConstraint::NotifyShapeChanged ( const BodyID &  inBodyID, Vec3Arg  inDeltaCOM  )

overridevirtual

Notify the constraint that the shape of a body has changed and that its center of mass has moved by inDeltaCOM. Bodies don't know which constraints are connected to them so the user is responsible for notifying the relevant constraints when a body changes.

Parameters

inBodyID	ID of the body that has changed
inDeltaCOM	The delta of the center of mass of the body (shape->GetCenterOfMass() - shape_before_change->GetCenterOfMass())

Implements Constraint.

ResetWarmStart()

void SliderConstraint::ResetWarmStart ( )

overridevirtual

Notify the system that the configuration of the bodies and/or constraint has changed enough so that the warm start impulses should not be applied the next frame. You can use this function for example when repositioning a ragdoll through Ragdoll::SetPose in such a way that the orientation of the bodies completely changes so that the previous frame impulses are no longer a good approximation of what the impulses will be in the next frame. Calling this function when there are no big changes will result in the constraints being much 'softer' than usual so they are more easily violated (e.g. a long chain of bodies might sag a bit if you call this every frame).

Implements Constraint.

RestoreState()

void SliderConstraint::RestoreState ( StateRecorder &  inStream )

overridevirtual

Restoring state for replay.

Reimplemented from Constraint.

SaveState()

void SliderConstraint::SaveState ( StateRecorder &  inStream ) const

overridevirtual

Saving state for replay.

Reimplemented from Constraint.

SetLimits()

void SliderConstraint::SetLimits	(	float	inLimitsMin,
		float	inLimitsMax
	)

Update the limits of the slider constraint (see SliderConstraintSettings)

SetLimitsSpringSettings()

void SliderConstraint::SetLimitsSpringSettings ( const SpringSettings &  inLimitsSpringSettings )

inline

SetMaxFrictionForce()

void SliderConstraint::SetMaxFrictionForce ( float  inFrictionForce )

inline

Friction control.

SetMotorState()

void SliderConstraint::SetMotorState ( EMotorState  inState )

inline

SetTargetPosition()

void SliderConstraint::SetTargetPosition ( float  inPosition )

inline

SetTargetVelocity()

void SliderConstraint::SetTargetVelocity ( float  inVelocity )

inline

SetupVelocityConstraint()

void SliderConstraint::SetupVelocityConstraint ( float  inDeltaTime )

overridevirtual

Implements Constraint.

SolvePositionConstraint()

bool SliderConstraint::SolvePositionConstraint ( float  inDeltaTime, float  inBaumgarte  )

overridevirtual

Implements Constraint.

SolveVelocityConstraint()

bool SliderConstraint::SolveVelocityConstraint ( float  inDeltaTime )

overridevirtual

Implements Constraint.

WarmStartVelocityConstraint()

void SliderConstraint::WarmStartVelocityConstraint ( float  inWarmStartImpulseRatio )

overridevirtual

Implements Constraint.

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

• Jolt/Physics/Constraints/SliderConstraint.h
• Jolt/Physics/Constraints/SliderConstraint.cpp