IntersectionOfWalls Class Reference

A IntersectionOfWalls is convex polygon defined as an intersection of InfiniteWall's. More...

#include <IntersectionOfWalls.h>

Inheritance diagram for IntersectionOfWalls:

Public Member Functions
	IntersectionOfWalls ()
	Default constructor. More...
	IntersectionOfWalls (const IntersectionOfWalls &other)
	Copy constructor. More...
virtual	~IntersectionOfWalls ()
	Destructor. More...
IntersectionOfWalls &	operator= (const IntersectionOfWalls &other)
IntersectionOfWalls *	copy () const override
	Wall copy method. It calls the copy constructor of this Wall, useful for polymorphism. More...
MERCURY_DEPRECATED void	clear ()
	Removes all parts of the walls. More...
void	addObject (Vec3D normal, Vec3D point)
	Adds a wall to the set of infinite walls, given an outward normal vector s.t. normal*x=normal*point. More...
MERCURY_DEPRECATED void	addObject (Vec3D normal, Mdouble position)
	Adds a wall to the set of finite walls, given an outward normal vector s. t. normal*x=position. More...
void	createOpenPrism (std::vector< Vec3D > points, Vec3D prismAxis)
	Creates an open prism which is a polygon between the points, except the first and last point, and extends infinitely in the PrismAxis direction. More...
void	createPrism (std::vector< Vec3D > points, Vec3D prismAxis)
	Creates an open prism which is a polygon between the points and extends infinitely in the PrismAxis direction. More...
void	createOpenPrism (std::vector< Vec3D > points)
	Creates an open prism which is a polygon between the points, except the first and last point, and extends infinitely in the direction perpendicular to the first and second wall. More...
void	createPrism (std::vector< Vec3D > points)
	Creates an open prism which is a polygon between the points and extends infinitely in the direction perpendicular to the first and second wall. More...
bool	getDistanceAndNormal (const BaseParticle &p, Mdouble &distance, Vec3D &normal_return) const override
	Compute the distance from the wall for a given BaseParticle and return if there is a collision. If there is a collision, also return the normal vector. More...
bool	getDistanceAndNormal (const Vec3D &postition, Mdouble wallInteractionRadius, Mdouble &distance, Vec3D &normal_return) const
	Compute the distance from the wall for a given BaseParticle and return if there is an interaction. If there is an interaction, also return the normal vector. More...
void	move (const Vec3D &move)
	Move the IntersectionOfWalls to a new position, which is a Vec3D from the old position. More...
void	read (std::istream &is)
	Reads an IntersectionOfWalls from an input stream, for example a restart file. More...
void	write (std::ostream &os) const
	Writes an IntersectionOfWalls to an output stream, for example a restart file. More...
std::string	getName () const override
	Returns the name of the object, here the string "IntersectionOfWalls". More...
BaseInteraction *	getInteractionWith (BaseParticle *p, Mdouble timeStamp, InteractionHandler *interactionHandler)
	Get the interaction between this IntersectionOfWalls and given BaseParticle at a given time. More...
Public Member Functions inherited from BaseWall
	BaseWall ()
	Default constructor. It makes an empty BaseWall. More...
	BaseWall (const BaseWall &w)
	Copy constructor. More...
virtual	~BaseWall ()
	Default destructor. More...
void	setHandler (WallHandler *handler)
	A function which sets the WallHandler for this BaseWall. More...
WallHandler *	getHandler () const
	A function which returns the WallHandler that handles this BaseWall. More...
void	setIndSpecies (unsigned int indSpecies)
	Define the species of this wall using the index of the species in the SpeciesHandler in this DPMBase. More...
void	setSpecies (const ParticleSpecies *species)
	Define the species of this wall. More...
Public Member Functions inherited from BaseInteractable
	BaseInteractable ()
	Default BaseInteractable constructor, it simply creates an empty BaseInteractable. More...
	BaseInteractable (const BaseInteractable &p)
	Copy constructor. It copies the BaseInteractable and all objects it contains. More...
virtual	~BaseInteractable ()
	Destructor, it simply destructs the BaseInteractable and all the objects it contains. More...
unsigned int	getIndSpecies () const
	Returns the index of the Species of this BaseInteractable. More...
const ParticleSpecies *	getSpecies () const
	Returns a pointer to the species of this BaseInteractable. More...
void	setSpecies (const ParticleSpecies *species)
	Sets the species of this BaseInteractable. More...
const Vec3D &	getForce () const
	Returns the force on this BaseInteractable. More...
const Vec3D &	getTorque () const
	Returns the torque on this BaseInteractable. More...
void	setForce (Vec3D force)
	Sets the force on this BaseInteractable. More...
void	setTorque (Vec3D torque)
	Sets the torque on this BaseInteractable. More...
void	addForce (Vec3D addForce)
	Adds an amount to the force on this BaseInteractable. More...
void	addTorque (Vec3D addTorque)
	Adds an amount to the torque on this BaseInteractable. More...
const Vec3D &	getPosition () const
	Returns the position of this BaseInteractable. More...
const Vec3D &	getOrientation () const
	Returns the orientation of this BaseInteractable. More...
void	setPosition (const Vec3D &position)
	Sets the position of this BaseInteractable. More...
void	setOrientation (const Vec3D &orientation)
	Sets the orientation of this BaseInteractable. More...
void	rotate (const Vec3D &rotate)
	Rotates this BaseInteractable. More...
const std::list < BaseInteraction * > &	getInteractions () const
	Returns a reference to the list of interactions in this BaseInteractable. More...
void	addInteraction (BaseInteraction *I)
	Adds an interaction to this BaseInteractable. More...
bool	removeInteraction (BaseInteraction *I)
	Removes an interaction from this BaseInteractable. More...
void	copyInteractionsForPeriodicParticles (const BaseInteractable &p)
	Copies interactions to this BaseInteractable whenever a periodic copy made. More...
void	setVelocity (const Vec3D &velocity)
	set the velocity of the BaseInteractable. More...
void	setAngularVelocity (const Vec3D &angularVelocity)
	set the angular velocity of the BaseInteractble. More...
void	addVelocity (const Vec3D &velocity)
	adds an increment to the velocity. More...
void	addAngularVelocity (const Vec3D &angularVelocity)
	add an increment to the angular velocity. More...
virtual const Vec3D &	getVelocity () const
	Returns the velocity of this interactable. More...
virtual const Vec3D &	getAngularVelocity () const
	Returns the angular velocity of this interactable. More...
void	setPrescribedPosition (std::function< Vec3D(double)> prescribedPosition)
	Allows the position of an infinite mass interactable to be prescribed. More...
void	applyPrescribedPosition (double time)
	Computes the position from the user defined prescribed position function. More...
void	setPrescribedVelocity (std::function< Vec3D(double)> prescribedVelocity)
	Allows the velocity of an infinite mass interactable to be prescribed. More...
void	applyPrescribedVelocity (double time)
	Computes the velocity from the user defined prescribed velocity function. More...
void	setPrescribedOrientation (std::function< Vec3D(double)> prescribedOrientation)
	Allows the orientation of the infinite mass interactbale to be prescribed. More...
void	applyPrescribedOrientation (double time)
	Computes the orientation from the user defined prescribed orientation function. More...
void	setPrescribedAngularVelocity (std::function< Vec3D(double)> prescribedAngularVelocity)
	Allows the angular velocity of the infinite mass interactable to be prescribed. More...
void	applyPrescribedAngularVelocity (double time)
	Computes the angular velocity from the user defined prescribed angular velocity. More...
virtual const Vec3D	getVelocityAtContact (const Vec3D &contact) const
	Returns the velocity at the contact point, use by many force laws. More...
void	integrateBeforeForceComputation (double time, double timeStep)
	This is part of integrate routine for objects with infinite mass. More...
void	integrateAfterForceComputation (double time, double timeStep)
	This is part of the integration routine for objects with infinite mass. More...
Public Member Functions inherited from BaseObject
	BaseObject ()
	Default constructor. More...
	BaseObject (const BaseObject &p)
	Copy constructor, copies all the objects BaseObject contains. More...
virtual	~BaseObject ()
	virtual destructor More...
virtual void	moveInHandler (const unsigned int index)
	Except that it is virtual, it does the same thing as setIndex() does. More...
void	setIndex (const unsigned int index)
	Allows one to assign an index to an object in the handler/container. More...
void	setId (const unsigned int id)
	Assigns a unique identifier to each object in the handler (container) which remains constant even after the object is deleted from the container/handler. More...
unsigned int	getIndex () const
	Returns the index of the object in the handler. More...
unsigned int	getId () const
	Returns the unique identifier of any particular object. More...

Private Attributes
std::vector< InfiniteWall >	wallObjects_
	The wall "segments"/directions that together make up the finite wall. More...
std::vector< Vec3D >	A_
	A vector that stores a point for each intersecting line between two different InfiniteWall. More...
std::vector< Vec3D >	AB_
	A vector that stores the direction of the intersecting lines between two different InfiniteWall. More...
std::vector< Vec3D >	C_
	A vector that stores the intersection point of three different InfiniteWall. More...

Detailed Description

A IntersectionOfWalls is convex polygon defined as an intersection of InfiniteWall's.

A IntersectionOfWalls can be defined as the intersection of a set of InfiniteWalls, defined by the normal vector into the wall and a point on the wall. For an example see Tutorial T8. A particle touches a finite wall if position_i-normal_i*x<=radius for all InfiniteWall's i.

Definition at line 44 of file IntersectionOfWalls.h.

Constructor & Destructor Documentation

IntersectionOfWalls::IntersectionOfWalls

(

)

Default constructor.

Definition at line 30 of file IntersectionOfWalls.cc.

References DEBUG, and logger.

Referenced by copy().

{
    logger(DEBUG, "IntersectionOfWalls() constructed.");
}

IntersectionOfWalls::IntersectionOfWalls

(

const IntersectionOfWalls &

other

)

Copy constructor.

Parameters

[in]

other

The IntersectionOfWalls that must be copied.

Definition at line 38 of file IntersectionOfWalls.cc.

References A_, AB_, C_, DEBUG, logger, and wallObjects_.

    : BaseWall(other)
{
    wallObjects_ = other.wallObjects_;
    A_ = other.A_;
    AB_ = other.AB_;
    C_ = other.C_;
    logger(DEBUG, "IntersectionOfWalls(IntersectionOfWalls&) constructed.");
}

IntersectionOfWalls::~IntersectionOfWalls ( )

virtual

Destructor.

Definition at line 48 of file IntersectionOfWalls.cc.

References DEBUG, and logger.

{
    logger(DEBUG, "~IntersectionOfWalls() has been called.");
}

Member Function Documentation

void IntersectionOfWalls::addObject	(	Vec3D	normal,
		Vec3D	point
	)

Adds a wall to the set of infinite walls, given an outward normal vector s.t. normal*x=normal*point.

Parameters

[in]	normal	The normal to this wallObject.
[in]	point	One of the points of the wallObject.

Adds a wall to the set of finite walls, given an outward unit normal vector s.t. normal*x=normal*point for all x of the wallObject. First make the InfiniteWall, then compute all intersections, which are then stored in A_, AB_ and C_.

Definition at line 90 of file IntersectionOfWalls.cc.

References A_, AB_, C_, Vec3D::cross(), Vec3D::dot(), BaseInteractable::getPosition(), logger, Vec3D::normalize(), VERBOSE, wallObjects_, X, Y, and Z.

Referenced by ChuteWithHopper::addHopper(), addObject(), createOpenPrism(), createPrism(), read(), and WallHandler::readOldObject().

{
    normal.normalize();

    //n is the index of the new wall
    std::size_t n = wallObjects_.size();
    wallObjects_.resize(n + 1);
    wallObjects_[n].set(normal, point);

    // AB[n*(n-1)/2+m] is the direction of the intersecting line between walls m and n, m<n
    // A[n*(n-1)/2+m] is a point on the intersecting line between walls m and n, m<n
    // See http://www.netcomuk.co.uk/~jenolive/vect18d.html for finding the line where two planes meet
    AB_.resize(n * (n + 1) / 2); //0 + 1 + 2 + ... + indexNew, total number of walls you need
    A_.resize(n * (n + 1) / 2);
    for (std::size_t m = 0; m < n; m++)
    {
        std::size_t id = (n - 1) * n / 2 + m;
        //first we cross the wall normals and normalize to obtain AB
        AB_[id] = Vec3D::cross(wallObjects_[m].getNormal(), wallObjects_[n].getNormal());
        AB_[id] /= sqrt(AB_[id].getLengthSquared());
        //then we find a point A (using AB*x=0 as a third plane)
        Mdouble invdet = 1.0 / (+wallObjects_[n].getNormal().X * (wallObjects_[m].getNormal().Y * AB_[id].Z - AB_[id].Y * wallObjects_[m].getNormal().Z)
                - wallObjects_[n].getNormal().Y * (wallObjects_[m].getNormal().X * AB_[id].Z - wallObjects_[m].getNormal().Z * AB_[id].X)
                + wallObjects_[n].getNormal().Z * (wallObjects_[m].getNormal().X * AB_[id].Y - wallObjects_[m].getNormal().Y * AB_[id].X));
        
        A_[id] = Vec3D( +(wallObjects_[m].getNormal().Y * AB_[id].Z - AB_[id].Y * wallObjects_[m].getNormal().Z) * Vec3D::dot(wallObjects_[n].getPosition(),wallObjects_[n].getNormal())
                        -(wallObjects_[n].getNormal().Y * AB_[id].Z - wallObjects_[n].getNormal().Z * AB_[id].Y) * Vec3D::dot(wallObjects_[m].getPosition(),wallObjects_[m].getNormal())
                        +(wallObjects_[n].getNormal().Y * wallObjects_[m].getNormal().Z - wallObjects_[n].getNormal().Z * wallObjects_[m].getNormal().Y) * 0.0,
                        -(wallObjects_[m].getNormal().X * AB_[id].Z - wallObjects_[m].getNormal().Z * AB_[id].X) * Vec3D::dot(wallObjects_[n].getPosition(),wallObjects_[n].getNormal())
                        +(wallObjects_[n].getNormal().X * AB_[id].Z - wallObjects_[n].getNormal().Z * AB_[id].X) * Vec3D::dot(wallObjects_[m].getPosition(),wallObjects_[m].getNormal())
                        -(wallObjects_[n].getNormal().X * wallObjects_[m].getNormal().Z - wallObjects_[m].getNormal().X * wallObjects_[n].getNormal().Z) * 0.0,
                        +(wallObjects_[m].getNormal().X * AB_[id].Y - AB_[id].X * wallObjects_[m].getNormal().Y) * Vec3D::dot(wallObjects_[n].getPosition(),wallObjects_[n].getNormal())
                        -(wallObjects_[n].getNormal().X * AB_[id].Y - AB_[id].X * wallObjects_[n].getNormal().Y) * Vec3D::dot(wallObjects_[m].getPosition(),wallObjects_[m].getNormal())
                        +(wallObjects_[n].getNormal().X * wallObjects_[m].getNormal().Y - wallObjects_[m].getNormal().X * wallObjects_[n].getNormal().Y) * 0.0) * invdet;
    }
    
    // C[(n-2)*(n-1)*n/6+(m-1)*m/2+l] is a point intersecting walls l, m and n, l<m<n
    C_.resize((n - 1) * n * (n + 1) / 6);
    for (std::size_t m = 0; m < n; m++)
    {
        for (std::size_t l = 0; l < m; l++)
        {
            std::size_t id = (n - 2) * (n - 1) * n / 6 + (m - 1) * m / 2 + l;
            Mdouble invdet = 1.0 / (+wallObjects_[n].getNormal().X * (wallObjects_[m].getNormal().Y * wallObjects_[l].getNormal().Z - wallObjects_[l].getNormal().Y * wallObjects_[m].getNormal().Z)
                    - wallObjects_[n].getNormal().Y * (wallObjects_[m].getNormal().X * wallObjects_[l].getNormal().Z - wallObjects_[m].getNormal().Z * wallObjects_[l].getNormal().X)
                    + wallObjects_[n].getNormal().Z * (wallObjects_[m].getNormal().X * wallObjects_[l].getNormal().Y - wallObjects_[m].getNormal().Y * wallObjects_[l].getNormal().X));
            C_[id] = Vec3D(+(wallObjects_[m].getNormal().Y * wallObjects_[l].getNormal().Z - wallObjects_[l].getNormal().Y * wallObjects_[m].getNormal().Z) * Vec3D::dot(wallObjects_[n].getPosition(),wallObjects_[n].getNormal())
                    - (wallObjects_[n].getNormal().Y * wallObjects_[l].getNormal().Z - wallObjects_[n].getNormal().Z * wallObjects_[l].getNormal().Y) * Vec3D::dot(wallObjects_[m].getPosition(),wallObjects_[m].getNormal())
                    + (wallObjects_[n].getNormal().Y * wallObjects_[m].getNormal().Z - wallObjects_[n].getNormal().Z * wallObjects_[m].getNormal().Y) * Vec3D::dot(wallObjects_[l].getPosition(),wallObjects_[l].getNormal()),
                    -(wallObjects_[m].getNormal().X * wallObjects_[l].getNormal().Z - wallObjects_[m].getNormal().Z * wallObjects_[l].getNormal().X) * Vec3D::dot(wallObjects_[n].getPosition(),wallObjects_[n].getNormal())
                            + (wallObjects_[n].getNormal().X * wallObjects_[l].getNormal().Z - wallObjects_[n].getNormal().Z * wallObjects_[l].getNormal().X) * Vec3D::dot(wallObjects_[m].getPosition(),wallObjects_[m].getNormal())
                            - (wallObjects_[n].getNormal().X * wallObjects_[m].getNormal().Z - wallObjects_[m].getNormal().X * wallObjects_[n].getNormal().Z) * Vec3D::dot(wallObjects_[l].getPosition(),wallObjects_[l].getNormal()),
                    +(wallObjects_[m].getNormal().X * wallObjects_[l].getNormal().Y - wallObjects_[l].getNormal().X * wallObjects_[m].getNormal().Y) * Vec3D::dot(wallObjects_[n].getPosition(),wallObjects_[n].getNormal())
                            - (wallObjects_[n].getNormal().X * wallObjects_[l].getNormal().Y - wallObjects_[l].getNormal().X * wallObjects_[n].getNormal().Y) * Vec3D::dot(wallObjects_[m].getPosition(),wallObjects_[m].getNormal())
                            + (wallObjects_[n].getNormal().X * wallObjects_[m].getNormal().Y - wallObjects_[m].getNormal().X * wallObjects_[n].getNormal().Y) * Vec3D::dot(wallObjects_[l].getPosition(),wallObjects_[l].getNormal())) * invdet;
        }
    }

    logger(VERBOSE, "%", *this);
    for (InfiniteWall w : wallObjects_)
        logger(VERBOSE, "wallObject %, %", w.getNormal(), w.getPosition());
    for (Vec3D v : A_)
        logger(VERBOSE, "A %", v);
    for (Vec3D v : AB_)
        logger(VERBOSE, "AB %", v);
    for (Vec3D v : C_)
        logger(VERBOSE, "C %", v);
}

void IntersectionOfWalls::addObject	(	Vec3D	normal,
		Mdouble	position
	)

Adds a wall to the set of finite walls, given an outward normal vector s. t. normal*x=position.

Deprecated:

Don't use this function, instead use the function addObject(Vec3D, Vec3D).

Parameters

[in]	normal	The normal to the wallObject.
[in]	position	The position of the wallObject in the direction of the normal vector.

Definition at line 163 of file IntersectionOfWalls.cc.

References addObject(), logger, and WARN.

{
    logger(WARN, "This function is deprecated, use IntersectionOfWalls::addObject(Vec3D, Vec3D) instead.");
    addObject(normal, position*normal);
}

void IntersectionOfWalls::clear ( )

virtual

Removes all parts of the walls.

Deprecated:

Please don't use any clear() anymore, it will be gone soon.

Reimplemented from BaseWall.

Definition at line 74 of file IntersectionOfWalls.cc.

References A_, AB_, C_, and wallObjects_.

Referenced by createOpenPrism().

{
    wallObjects_.clear();
    A_.clear();
    AB_.clear();
    C_.clear();
}

IntersectionOfWalls * IntersectionOfWalls::copy ( ) const

overridevirtual

Wall copy method. It calls the copy constructor of this Wall, useful for polymorphism.

Returns

pointer to a IntersectionOfWalls object allocated using new.

Implements BaseWall.

Definition at line 69 of file IntersectionOfWalls.cc.

References IntersectionOfWalls().

Referenced by operator=().

{
    return new IntersectionOfWalls(*this);
}

void IntersectionOfWalls::createOpenPrism	(	std::vector< Vec3D >	points,
		Vec3D	prismAxis
	)

Creates an open prism which is a polygon between the points, except the first and last point, and extends infinitely in the PrismAxis direction.

Parameters

[in]	points	A vector of 3D-vectors which contains the points between which the polygon is drawn.
[in]	prismAxis	A 3D-vector which represents the direction in which the prism is extended infinitely.

Create an open prism which is a polygon with no connection between the first and last point, and extending infinitely in the other direction, which is defined as PrismAxis. Do this by adding the walls between the consecutive points one by one.

Definition at line 177 of file IntersectionOfWalls.cc.

References addObject(), clear(), and Vec3D::cross().

Referenced by createOpenPrism(), and createPrism().

{
    clear();
    //note: use i+1 < points.size() instead of i < points.size()-1, otherwise it creates havoc if point has zero entries.
    for (unsigned int i = 0; i+1 < points.size(); i++)
        addObject(Vec3D::cross(points[i] - points[i + 1], prismAxis), points[i]);
}

void IntersectionOfWalls::createOpenPrism

(

std::vector< Vec3D >

points

)

Creates an open prism which is a polygon between the points, except the first and last point, and extends infinitely in the direction perpendicular to the first and second wall.

Parameters

[in]

points

A vector of 3D-vectors which contains the points between which the polygon is drawn.

Create an open prism which is a polygon with no connection between the first and last point, and extending infinitely in the direction perpendicular to the first and second wall. Do this by first computing in which direction the wall must be extended infinitely, then call createOpenPrism(points, prismAxis).

Definition at line 205 of file IntersectionOfWalls.cc.

References createOpenPrism(), Vec3D::cross(), and Vec3D::getUnitVector().

{
    Vec3D prismAxis = Vec3D::cross(
            Vec3D::getUnitVector(points[2] - points[0]),
            Vec3D::getUnitVector(points[1] - points[0]));
    createOpenPrism(points, prismAxis);
}

void IntersectionOfWalls::createPrism	(	std::vector< Vec3D >	points,
		Vec3D	prismAxis
	)

Creates an open prism which is a polygon between the points and extends infinitely in the PrismAxis direction.

Parameters

[in]	points	A vector of 3D-vectors which contains the points between which the polygon is drawn.
[in]	prismAxis	A 3D-vector which represents the direction in which the prism is extended infinitely.

Create an open prism which is a polygon and extending infinitely in the other direction, which is defined as PrismAxis. Do this by first creating an open prism and then connect the last and the first point.

Definition at line 192 of file IntersectionOfWalls.cc.

References addObject(), createOpenPrism(), and Vec3D::cross().

Referenced by createPrism().

{
    createOpenPrism(points, prismAxis);
    addObject(Vec3D::cross(points.back() - points.front(), prismAxis), points.front());
}

void IntersectionOfWalls::createPrism

(

std::vector< Vec3D >

points

)

Creates an open prism which is a polygon between the points and extends infinitely in the direction perpendicular to the first and second wall.

Parameters

[in]

points

A vector of 3D-vectors which contains the points between which the polygon is drawn.

Create an open prism which is a polygon, and extending infinitely in the direction perpendicular to the first and second wall. Do this by first computing in which direction the wall must be extended infinitely, then call createOpenPrism(points, prismAxis).

Definition at line 220 of file IntersectionOfWalls.cc.

References createPrism(), Vec3D::cross(), and Vec3D::getUnitVector().

{
    Vec3D prismAxis = Vec3D::cross(
            Vec3D::getUnitVector(points[2] - points[0]),
            Vec3D::getUnitVector(points[1] - points[0]));
    createPrism(points, prismAxis);
}

bool IntersectionOfWalls::getDistanceAndNormal ( const BaseParticle &  p, Mdouble &  distance, Vec3D &  normal_return  ) const

overridevirtual

Compute the distance from the wall for a given BaseParticle and return if there is a collision. If there is a collision, also return the normal vector.

Parameters

[in]	p	BaseParticle we want to calculate the distance and whether it collided of.
[out]	distance	The distance of the BaseParticle to this wall.
[out]	normal_return	If there was a collision, the normal vector to this wall will be placed here.

Returns

A boolean which says whether or not there was a collision.

This function computes whether or not there is a collision between a given BaseParticle and this IntersectionOfWalls. If there is a collision, this function also computes the distance between the BaseParticle and IntersectionOfWalls and the normal of the IntersectionOfWalls at the intersection point. It does this by calling IntersectionOfWalls::getDistanceAndNormal(const Vec3D& , Mdouble , Mdouble&, Vec3D&) const. Since this function should be called before calculating any Particle-Wall interactions, it can also be used to set the normal vector in case of curved walls.

Implements BaseWall.

Definition at line 242 of file IntersectionOfWalls.cc.

References BaseParticle::getInteractionRadius(), and BaseInteractable::getPosition().

Referenced by AxisymmetricIntersectionOfWalls::getDistanceAndNormal(), and getInteractionWith().

{
    return getDistanceAndNormal(p.getPosition(), p.getInteractionRadius(), distance, normal_return);
}

bool IntersectionOfWalls::getDistanceAndNormal	(	const Vec3D &	position,
		Mdouble	wallInteractionRadius,
		Mdouble &	distance,
		Vec3D &	normal_return
	)		const

Compute the distance from the wall for a given BaseParticle and return if there is an interaction. If there is an interaction, also return the normal vector.

Parameters

[in]	position	The position of the object there is possible an interaction with.
[in]	wallInteractionRadius	The maximum distance between the IntersectionOfWalls and the input argument position for which there is an interaction.
[out]	distance	The distance of the object at position to this wall.
[out]	normal_return	If there was an interaction, the normal vector to this wall will be placed here.

Returns

A boolean which says whether or not there was an interaction.

This function computes whether or not there is an interaction between an object at the given distance and this IntersectionOfWalls. If there is an interaction, this function also computes the distance between the BaseParticle and IntersectionOfWalls and the normal of the IntersectionOfWalls at the intersection point. First check if the distance between the object at position and the IntersectionOfWalls is smaller or greater than the wallInteractionRadius. If there is no interaction, return false, the output parameters then have no meaning. If there is an interaction, find out which (one or more) of the InfiniteWall there is an interaction with. Then compute the distance between the particle and InfiniteWall and the normal to the interaction point. Since this function should be called before calculating any Particle-Wall interactions, it can also be used to set the normal vector in case of curved walls.

Definition at line 269 of file IntersectionOfWalls.cc.

References A_, AB_, C_, Vec3D::dot(), Vec3D::getLengthSquared(), and wallObjects_.

{
    distance = -1e20;
    Mdouble distance2 = -1e20;
    Mdouble distance3 = -1e20;
    Mdouble distanceCurrent;
    unsigned int id=0;
    unsigned int id2=0;
    unsigned int id3=0;

    //The object has to touch each wall  each wall (distanceCurrent) and keep the minimum distance (distance) and wall index (id)
    for (unsigned int i = 0; i < wallObjects_.size(); i++)
    {
        // Calculate distance to each wall (distanceCurrent);
        distanceCurrent = wallObjects_[i].getDistance(position);
        // The object has to touch each wall (distanceCurrent >= wallInteractionRadius), otherwise return false (i.e. no contact)
        // This means that for each InfiniteWall in wallObjects_, the particle is either "inside"
        // the wall or touching it. If not, there is no interaction.
        if (distanceCurrent >= wallInteractionRadius)
            return false;
        // Find out which of the InfiniteWalls is interacting with the particle.
        // Keep the minimum distance (distance) and wall index (id)
        // and store up to two walls (id2, id3) and their distances (distance2, distance3),
        // if the possible contact point is near the intersection between id and id2 (and id3)
        if (distanceCurrent > distance)
        {
            if (distance > -wallInteractionRadius)
            {
                if (distance2 > -wallInteractionRadius)
                {
                    distance3 = distance;
                    id3 = id;
                }
                else
                {
                    distance2 = distance;
                    id2 = id;
                }
            }
            distance = distanceCurrent;
            id = i;
        }
        else if (distanceCurrent > -wallInteractionRadius)
        {
            if (distance2 > -wallInteractionRadius)
            {
                distance3 = distanceCurrent;
                id3 = i;
            }
            else
            {
                distance2 = distanceCurrent;
                id2 = i;
            }
        }
    }
    
    //If we are here, the closest wall is id;
    //if distance2>-P.Radius (and distance3>-P.Radius), the possible contact point
    // is near the intersection between id and id2 (and id3)
    if (distance2 > -wallInteractionRadius)
    {
        //D is the point on wall id closest to P
        Vec3D D = position + wallObjects_[id].getNormal() * distance;
        //If the distance of D to id2 is positive, the contact is with the intersection
        bool intersection_with_id2 = (wallObjects_[id2].getDistance(D) > 0.0);
        
        if (distance3 > -wallInteractionRadius && (wallObjects_[id3].getDistance(D) > 0.0))
        {
            if (intersection_with_id2)
            {
                //possible contact is with intersection of id,id2,id3
                //we know id2<id3
                unsigned int index =
                        (id < id2) ? ((id3 - 2) * (id3 - 1) * id3 / 6 + (id2 - 1) * id2 / 2 + id) :
                        (id < id3) ? ((id3 - 2) * (id3 - 1) * id3 / 6 + (id - 1) * id / 2 + id2) :
                                     ((id - 2) * (id - 1) * id / 6 + (id3 - 1) * id3 / 2 + id2);
                normal_return = position - C_[index];
                distance = sqrt(normal_return.getLengthSquared());
                if (distance >= wallInteractionRadius)
                    return false; //no contact
                normal_return /= -distance;
                return true; //contact with id,id2,id3
            }
            else
            {
                intersection_with_id2 = true;
                distance2 = distance3;
                id2 = id3;
            }
        }
        
        if (intersection_with_id2)
        { //possible contact is with intersection of id,id2
            unsigned int index = (id > id2) ? ((id - 1) * id / 2 + id2) : ((id2 - 1) * id2 / 2 + id);
            Vec3D AC = position - A_[index];
            normal_return = AC - AB_[index] * Vec3D::dot(AC, AB_[index]);
            distance = sqrt(normal_return.getLengthSquared());
            if (distance >= wallInteractionRadius)
                return false; //no contact
            normal_return /= -distance;
            return true; //contact with two walls
        }
    }
    //contact is with id
    normal_return = wallObjects_[id].getNormal();
    return true;
}

BaseInteraction * IntersectionOfWalls::getInteractionWith ( BaseParticle *  p, Mdouble  timeStamp, InteractionHandler *  interactionHandler  )

virtual

Get the interaction between this IntersectionOfWalls and given BaseParticle at a given time.

Parameters

[in]	p	Pointer to the BaseParticle which we want to check the interaction for.
[in]	timeStamp	The time at which we want to look at the interaction.
[in]	interactionHandler	A pointer to the InteractionHandler in which the interaction can be found.

Returns

A pointer to the BaseInteraction that happened between this InfiniteWall and the BaseParticle at the timeStamp.

Todo:

{DK: What is the contact point for interactions with walls}

Implements BaseInteractable.

Definition at line 454 of file IntersectionOfWalls.cc.

References getDistanceAndNormal(), InteractionHandler::getInteraction(), BaseInteraction::getNormal(), BaseInteraction::getOverlap(), BaseInteractable::getPosition(), BaseParticle::getRadius(), BaseInteraction::setContactPoint(), BaseInteraction::setDistance(), BaseInteraction::setNormal(), and BaseInteraction::setOverlap().

{
    Mdouble distance;
    Vec3D normal;

    if (getDistanceAndNormal(*p, distance, normal))
    {
        BaseInteraction* c = interactionHandler->getInteraction(p, this, timeStamp);
        c->setNormal(-normal);
        c->setDistance(distance);
        c->setOverlap(p->getRadius() - distance);
        c->setContactPoint(p->getPosition() - (p->getRadius() - 0.5 * c->getOverlap()) * c->getNormal());
        return c;
    }
    else
    {
        return nullptr;
    }
}

std::string IntersectionOfWalls::getName ( ) const

overridevirtual

Returns the name of the object, here the string "IntersectionOfWalls".

Returns

The string "IntersectionOfWalls".

Implements BaseObject.

Definition at line 442 of file IntersectionOfWalls.cc.

{
    return "IntersectionOfWalls";
}

void IntersectionOfWalls::move ( const Vec3D &  move )

virtual

Move the IntersectionOfWalls to a new position, which is a Vec3D from the old position.

Parameters

[in]

move

A reference to a Vec3D that denotes the direction and length it should be moved with.

A function that moves the InterSectionOfWalls in a certain direction by both moving the walls and all intersections. Note that the directions of the intersections are not moved since they don't change when moving the IntersectionOfWalls as a whole.

Todo:

We should use the position_ and orientation_ of the IntersectionOfWalls; that way, IntersectionOfWalls can be moved with the standard BaseInteractable::move function, getting rid of an anomaly in the code and removing the virtual from the move function.

Author

weinhartt

Reimplemented from BaseInteractable.

Definition at line 389 of file IntersectionOfWalls.cc.

References A_, C_, BaseInteractable::move(), and wallObjects_.

{
    BaseInteractable::move(move);
    for(Vec3D& a : A_)
    {
        a += move;
    }
    for(Vec3D& c : C_)
    {
        c += move;
    }  
    for(InfiniteWall& o : wallObjects_)
    {
        o.move(move);
    }
}

IntersectionOfWalls & IntersectionOfWalls::operator=

(

const IntersectionOfWalls &

other

)

Copy assignment operator.

Parameters

[in]

other

The IntersectionOfWalls that must be copied.

Definition at line 56 of file IntersectionOfWalls.cc.

References copy(), DEBUG, and logger.

{
    logger(DEBUG, "IntersectionOfWalls::operator= called.");
    if (this == &other)
    {
        return *this;
    }
    return *(other.copy());
}

void IntersectionOfWalls::read ( std::istream &  is )

virtual

Reads an IntersectionOfWalls from an input stream, for example a restart file.

Parameters

[in]

is

The input stream from which the IntersectionOfWalls is read, usually a restart file.

Reimplemented from BaseWall.

Definition at line 409 of file IntersectionOfWalls.cc.

References addObject(), and BaseWall::read().

Referenced by AxisymmetricIntersectionOfWalls::read().

{
    BaseWall::read(is);
    std::string dummy;
    int n;
    is >> dummy >> n;
    
    Vec3D normal;
    Vec3D position;
    for (int i = 0; i < n; i++)
    {
        is >> dummy >> normal >> dummy >> position;
        addObject(normal, position);
    }
}

void IntersectionOfWalls::write ( std::ostream &  os ) const

virtual

Writes an IntersectionOfWalls to an output stream, for example a restart file.

Parameters

[in]

os

The output stream where the IntersectionOfWalls must be written to, usually a restart file.

Reimplemented from BaseWall.

Definition at line 429 of file IntersectionOfWalls.cc.

References wallObjects_, and BaseWall::write().

Referenced by AxisymmetricIntersectionOfWalls::write().

{
    BaseWall::write(os);
    os << " numIntersectionOfWalls " << wallObjects_.size();
    for (std::vector<InfiniteWall>::const_iterator it = wallObjects_.begin(); it != wallObjects_.end(); ++it)
    {
        os << " normal " << it->getNormal() << " position " << it->getPosition();
    }
}

Member Data Documentation

std::vector<Vec3D> IntersectionOfWalls::A_

private

A vector that stores a point for each intersecting line between two different InfiniteWall.

A[n*(n-1)/2+m] is a point on the intersecting line between walls m and n, m<n.

Definition at line 160 of file IntersectionOfWalls.h.

Referenced by addObject(), clear(), getDistanceAndNormal(), IntersectionOfWalls(), and move().

std::vector<Vec3D> IntersectionOfWalls::AB_

private

A vector that stores the direction of the intersecting lines between two different InfiniteWall.

AB[n*(n-1)/2+m] is the direction of the intersecting line between walls m and n, m<n.

Definition at line 167 of file IntersectionOfWalls.h.

Referenced by addObject(), clear(), getDistanceAndNormal(), and IntersectionOfWalls().

std::vector<Vec3D> IntersectionOfWalls::C_

private

A vector that stores the intersection point of three different InfiniteWall.

C[(n-2)*(n-1)*n/6+(m-1)*m/2+l] is a point intersecting walls l, m and n, l<m<n

Definition at line 174 of file IntersectionOfWalls.h.

Referenced by addObject(), clear(), getDistanceAndNormal(), IntersectionOfWalls(), and move().

std::vector<InfiniteWall> IntersectionOfWalls::wallObjects_

private

The wall "segments"/directions that together make up the finite wall.

An intersection of walls exists of a number of infinite walls that are cut of at the intersection points. These InfiniteWall are saved in this vector called iWObjects_.

Definition at line 153 of file IntersectionOfWalls.h.

Referenced by addObject(), clear(), getDistanceAndNormal(), IntersectionOfWalls(), move(), and write().

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

• Walls/IntersectionOfWalls.h
• Walls/IntersectionOfWalls.cc