A class representing a point sphere with a given diameter. More...

#include <shape_point_sphere.hpp>

Inheritance diagram for netdem::PointSphere:

Public Member Functions
	PointSphere ()
	Default constructor.

	PointSphere (double d)
	Constructor that sets the diameter of the PointSphere object.

Shape *	Clone () const override
	Clone the PointSphere object.

nlohmann::json	PackJson () override
	Pack the PointSphere object into a JSON structure.

void	InitFromJson (nlohmann::json const &js) override
	Initialize the PointSphere object from a JSON structure.

void	Init ()
	Initialize the PointSphere object.

void	UpdateSurfaceNodes () override
	Update the surface nodes of the PointSphere object.

void	UpdateShapeProperties () override
	Update the shape properties of the PointSphere object.

STLModel	GetSTLModel (int num_nodes=200) override
	Generate an STL model of the PointSphere object.

Vec3d	SupportPoint (Vec3d const &dir) override
	Compute the support point of the PointSphere object in a given direction.

VecXT< Vec3d >	SupportPoints (Vec3d const &dir) override
	Compute the support points of the PointSphere object in a given direction.

double	SignedDistance (Vec3d const &pos) const override
	Compute the signed distance from a given position to the surface of the PointSphere object.

Vec3d	SurfacePoint (Vec3d const &pos) override
	Compute the surface point on the PointSphere object closest to a given position.

void	Print () override
	Print information about the PointSphere object.

Public Member Functions inherited from netdem::Shape
virtual void	InitFromJsonFile (std::string const &js_file)
	Initializes the shape instance from a JSON file.

virtual double	GetSize () const
	Return shape size, which is defined as the diameter of equal-volume sphere.

virtual double	GetVolume () const
	Return the volume of the shape.

virtual Mat3d const &	GetInertia () const
	Return the inertia of the shape.

Vec3d	GetInertiaPrincipal () const
	Return the principal inertia of the shape.

virtual double	GetBoundSphereRadius () const
	Return the inertia of the shape.

virtual std::tuple< Vec3d, Vec3d >	GetBoundAABB () const
	Gets the boundary AABB of the shape instance.

virtual std::tuple< Vec3d, Vec3d >	GetBoundAABB (Vec3d const &pos, Vec4d const &quat) const
	Gets the boundary AABB of the shape instance.

virtual double	GetSkin () const
	Return skin size of the shape.

virtual double	GetSkinFactor () const
	Return skin factor of the shape.

virtual double	GetSurfaceNodeNum () const
	Return number of surface nodes of the shape.

virtual VecXT< Vec3d > const &	GetSurfaceNodes () const
	Return surface nodes of the shape.

virtual VecXT< double > const &	GetSurfaceNodeAreas () const
	Return surface area associated with each surface node.

virtual double	GetSurfaceNodeSpacing () const
	Return spacing of surface nodes.

const STLModel &	GetRenderMesh () const
	Return the surface mesh for rendering.

bool	CheckConvexity ()
	Return the convexity of the shape.

virtual void	Translate (Vec3d const &pos)
	Translates the shape instance to a new position.

virtual void	UpdateRenderMesh (int num_nodes=200)
	Initializes the surface mesh for rendering.

virtual void	SetSize (double d)
	Sets the size of the shape instance.

virtual void	SetSkin (double sk)
	Set skin size of the shape.

virtual void	SetSkinFactor (double sk_factor)
	Set skin size factor (skin = size by skin size factor) of the shape.

virtual void	EnableSurfaceNodes ()
	Enable the use of surface nodes.

virtual void	DisableSurfaceNodes ()
	Disable the use of surface nodes.

virtual bool	IsSurfaceNodesEnabled ()
	Check if the use of surface nodes is enabled.

virtual void	SetSurfaceNodeNum (int num)
	Set number of surface nodes of the shape.

virtual void	SetSurfaceNodes (VecXT< Vec3d > const &nodes)
	Set the surface nodes of the shape.

virtual void	SetSurfaceNodes (STLModel const &surf_stl)
	Set the surface nodes of the shape.

virtual void	SaveAsVTK (std::string const &filename)
	Saves the shape instance as a VTK file.

virtual void	SaveAsSTL (std::string const &filename)
	Saves the shape instance as an STL file.

virtual bool	CheckEnclose (Vec3d const &pos) const
	Determines whether a given point is enclosed within the shape instance.

virtual bool	CheckPrincipal () const
	Determines whether the shape is in principal configuration.

virtual	~Shape ()
	Destructor for the Shape class.

Public Attributes
double	node_area_corrector {0.01}
	A factor to be multiplied with the node area, to make the contact behavior be equivalent to that of regular sphere. It can be taken as the estimated true number of intruding node divided by the total number. 0.01 is a good choice with a balance of numerical stability and accuracy.

Public Attributes inherited from netdem::Shape
int	id {0}
	ID of the shape instance.

std::string	label {"default"}
	Label of the shape instance.

Type	shape_type {Type::none}
	Type of the shape instance.

std::string	shape_name {"shape"}
	Name of the shape instance.

bool	use_customized_solver {false}
	Determines whether to use a customized contact solver or not.

STLModel	render_mesh
	Surface mesh for rendering.

Additional Inherited Members
Public Types inherited from netdem::Shape
enum	Type { none , point_sphere , sphere , spherical_harmonics , trimesh , trimesh_convex , ellipsoid , polybezier , triangle , plane , cylinder , poly_super_ellipsoid , poly_super_quadrics , level_set , netsdf , coded_netsdf , num_shapes }
	Enumeration for different types of shapes. More...

Static Public Member Functions inherited from netdem::Shape
static MatNd< 8, 3 >	VerticesOfAABB (Vec3d const &bmin, Vec3d const &bmax)
	Gets the vertices of the boundary AABB of the shape instance.

Protected Attributes inherited from netdem::Shape
double	size {1.0}
	Size and volume of the shape instance.

double	volume {0.5236}
	Volume of the shape instance.

Mat3d	inertia {{{0.05236, 0, 0}, {0, 0.05236, 0}, {0, 0, 0.05236}}}
	Inertia tensor of the shape instance.

double	bound_sphere_radius {0.5}
	Radius of the bounding sphere used for broad-phase contact detection.

double	skin {0.025}
	Skin thickness used for broad-phase contact detection.

double	skin_factor {0.05}
	Factor used to adjust the skin thickness.

Vec3d	bound_aabb_min {-0.5, -0.5, -0.5}
	Minimum bounds of the AABB used for broad-phase contact detection.

Vec3d	bound_aabb_max {0.5, 0.5, 0.5}
	Maximum bounds of the AABB used for broad-phase contact detection.

bool	is_convex {true}
	Determines whether the shape instance is convex or not.

bool	use_surface_nodes {false}
	Determines whether to use nodes for the contact solver.

int	surface_node_num {1000}
	Number of nodes used for the contact solver.

double	surface_node_spacing {std::sqrt(Math::PI / 1000.0)}
	Spacing between nodes used for the contact solver.

VecXT< Vec3d >	surface_nodes
	Surface nodes of the shape instance used for the contact solver.

VecXT< double >	surface_node_areas
	Area associated with each surface node.

Detailed Description

A class representing a point sphere with a given diameter.

This class provides methods for setting and updating the position of the point sphere, computing its surface properties, generating STL models for visualization, and calculating signed distances and surface points.

Additionally, the PointSphere class is a subclass of the Shape class, which allows it to be used in combination with other shapes in compound objects.

Constructor & Destructor Documentation

◆ PointSphere() [1/2]

PointSphere::PointSphere ( )

Default constructor.

◆ PointSphere() [2/2]

PointSphere::PointSphere ( double d )

Constructor that sets the diameter of the PointSphere object.

Parameters

d	The diameter of the PointSphere object.

Member Function Documentation

◆ Clone()

Shape * PointSphere::Clone ( ) const

overridevirtual

Clone the PointSphere object.

This method creates a copy of the PointSphere object.

Returns: A pointer to the cloned PointSphere object.

Reimplemented from netdem::Shape.

◆ GetSTLModel()

STLModel PointSphere::GetSTLModel ( int num_nodes = 200 )

overridevirtual

Generate an STL model of the PointSphere object.

This method generates an STL model of the PointSphere object using the specified number of nodes for each surface triangle.

Parameters

num_nodes The number of nodes to use for each surface triangle (default: 200).

Returns: An STLModel object representing the PointSphere object.

Reimplemented from netdem::Shape.

◆ Init()

void PointSphere::Init ( )

Initialize the PointSphere object.

This method initializes the PointSphere object by updating its nodes and shape properties.

◆ InitFromJson()

void PointSphere::InitFromJson ( nlohmann::json const & js )

overridevirtual

Initialize the PointSphere object from a JSON structure.

This method initializes the PointSphere object from a JSON structure previously generated by PackJson().

Parameters

js	The JSON structure to load.

Reimplemented from netdem::Shape.

◆ PackJson()

nlohmann::json PointSphere::PackJson ( )

overridevirtual

Pack the PointSphere object into a JSON structure.

This method packs the PointSphere object into a JSON structure for serialization and storage.

Returns: The packed JSON structure.

Reimplemented from netdem::Shape.

◆ Print()

void PointSphere::Print ( )

overridevirtual

Print information about the PointSphere object.

This method prints basic information about the PointSphere object, including its position, rotation, size, volume, and surface area.

Reimplemented from netdem::Shape.

◆ SignedDistance()

double PointSphere::SignedDistance ( Vec3d const & pos ) const

overridevirtual

Compute the signed distance from a given position to the surface of the PointSphere object.

This method computes the signed distance from a given position to the surface of the PointSphere object using its center point and diameter.

Parameters

pos	The position for which to compute the signed distance.

Returns: The signed distance from the specified position to the surface of the PointSphere object.

Reimplemented from netdem::Shape.

◆ SupportPoint()

Vec3d PointSphere::SupportPoint ( Vec3d const & dir )

overridevirtual

Compute the support point of the PointSphere object in a given direction.

This method computes the support point of the PointSphere object in a given direction, which is the point on the sphere surface farthest in the specified direction.

Parameters

dir	The direction in which to compute the support point.

Returns: The support point of the PointSphere object in the specified direction.

Reimplemented from netdem::Shape.

◆ SupportPoints()

VecXT< Vec3d > PointSphere::SupportPoints ( Vec3d const & dir )

overridevirtual

Compute the support points of the PointSphere object in a given direction.

This method computes the support points of the PointSphere object in a given direction, which are two opposite points on the sphere surface farthest along the specified direction.

Parameters

dir	The direction in which to compute the support points.

Returns: A vector containing the two support points of the PointSphere object in the specified direction.

Reimplemented from netdem::Shape.

◆ SurfacePoint()

Vec3d PointSphere::SurfacePoint ( Vec3d const & pos )

overridevirtual

Compute the surface point on the PointSphere object closest to a given position.

This method computes the surface point on the PointSphere object closest to a given position by finding the point on the sphere surface that has the minimum distance to the specified position.

Parameters

pos	The position for which to compute the closest surface point.

Returns: The surface point on the PointSphere object closest to the specified position.

Reimplemented from netdem::Shape.

◆ UpdateShapeProperties()

void PointSphere::UpdateShapeProperties ( )

overridevirtual

Update the shape properties of the PointSphere object.

This method updates the shape properties of the PointSphere object, such as its volume and surface area.

Reimplemented from netdem::Shape.

◆ UpdateSurfaceNodes()

void PointSphere::UpdateSurfaceNodes ( )

overridevirtual

Update the surface nodes of the PointSphere object.

This method updates the surface nodes of the PointSphere object based on its current position and rotation.

Reimplemented from netdem::Shape.

Member Data Documentation

◆ node_area_corrector

double netdem::PointSphere::node_area_corrector {0.01}

A factor to be multiplied with the node area, to make the contact behavior be equivalent to that of regular sphere. It can be taken as the estimated true number of intruding node divided by the total number. 0.01 is a good choice with a balance of numerical stability and accuracy.

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

/Users/lzhshou/Documents/Research/myProjects/apaam/repo/netdem/src/shape/shape_point_sphere.hpp
/Users/lzhshou/Documents/Research/myProjects/apaam/repo/netdem/src/shape/shape_point_sphere.cpp

Public Member Functions

Public Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ PointSphere() [1/2]

◆ PointSphere() [2/2]

Member Function Documentation

◆ Clone()

◆ GetSTLModel()

◆ Init()

◆ InitFromJson()

◆ PackJson()

◆ Print()

◆ SignedDistance()

◆ SupportPoint()

◆ SupportPoints()

◆ SurfacePoint()

◆ UpdateShapeProperties()

◆ UpdateSurfaceNodes()

Member Data Documentation

◆ node_area_corrector