A null geodesic transporting light. More...

#include <GyotoPhoton.h>

Inheritance diagram for Gyoto::Photon:

Classes
class	Refined
	Refine last step of integration in a Photon. More...

Public Types
typedef Gyoto::SmartPointer< Gyoto::SmartPointee >	Subcontractor_t(Gyoto::FactoryMessenger *, std::vector< std::string > const &)
	A subcontractor builds an object upon order from the Factory. More...

Public Member Functions
virtual Property const *	getProperties () const
	Get list of properties. More...

virtual std::string	className () const
	"Photon" More...

virtual std::string	className_l () const
	"photon" More...

	Photon ()
	Default constructor. More...

	Photon (const Photon &)
	Copy constructor.

Photon *	clone () const
	Cloner.

	Photon (SmartPointer< Metric::Generic > gg, SmartPointer< Astrobj::Generic > obj, double *coord)
	Same as Photon() followed by setInitialCondition(SmartPointer<Metric::Generic> gg, SmartPointer<Astrobj::Generic> obj, const double coord[8])

	Photon (SmartPointer< Metric::Generic > gg, SmartPointer< Astrobj::Generic > obj, SmartPointer< Screen > screen, double d_alpha, double d_delta)
	Same as Photon() followed by setInitialCondition(SmartPointer<Metric::Generic> gg, SmartPointer<Astrobj::Generic> obj, SmartPointer<Screen> screen, double d_alpha, double d_delta)

virtual	~Photon ()
	Destructor.

virtual double	getMass () const
	Return 0. More...

void	astrobj (SmartPointer< Astrobj::Generic >)
	Set Photon::object_.

SmartPointer< Astrobj::Generic >	astrobj () const
	Get Photon::object_.

void	metric (SmartPointer< Metric::Generic >)

void	spectrometer (SmartPointer< Spectrometer::Generic > spr)
	Set Photon::spectro_.

SmartPointer< Spectrometer::Generic >	spectrometer () const
	Get Photon::spectro_.

void	freqObs (double)
	Set Photon::freq_obs__.

double	freqObs () const
	Get Photon::freq_obs__.

void	setInitialCondition (SmartPointer< Metric::Generic > gg, SmartPointer< Astrobj::Generic > obj, const double coord[8])
	Set or re-set the initial condition prior to integration. More...

void	setInitialCondition (SmartPointer< Metric::Generic > gg, SmartPointer< Astrobj::Generic > obj, const double coord[8], const double Ephi[4], const double Etheta[4])
	Set or re-set the initial condition prior to integration. More...

void	setInitialCondition (SmartPointer< Metric::Generic > gg, SmartPointer< Astrobj::Generic > obj, SmartPointer< Screen > screen, double d_alpha, double d_delta)
	Set or re-set the initial condition prior to integration. More...

int	hit (Astrobj::Properties *data=NULL)
	Integrate the geodesic. More...

double	findMin (Functor::Double_constDoubleArray *object, double t1, double t2, double &tmin, double threshold=DBL_MIN)
	Find minimum of photon–object distance. More...

void	findValue (Functor::Double_constDoubleArray *object, double value, double tinside, double &toutside)
	Find date for which the photon is at a given distance from the object. More...

virtual void	setParameters (FactoryMessenger *fmp)
	Main loop for parsing Properties from XML description. More...

void	resetTransmission ()
	Set transmission to 1 for each channel as well as scalar transmission.

double	getTransmission (size_t i) const
	Get transmission. More...

double	getTransmissionMax () const
	Get maximum transmission;. More...

double const *	getTransmission () const
	Get Photon::transmission_. More...

virtual void	transmit (size_t i, double t)
	Update transmission in a given channel. More...

virtual void	transfer (double Inu, double Qnu, double Unu, double Vnu, double const aInu, double const aQnu, double const aUnu, double const aVnu, double const rQnu, double const rUnu, double const *rVnu)
	Perform one step of radiative transfer. More...

void	metric (SmartPointer< Metric::Generic >)
	Set metric Smartpointer.

SmartPointer< Metric::Generic >	metric () const
	Get metric.

void	setInitialCondition (SmartPointer< Metric::Generic > gg, const double coord[8], const int dir, double const Ephi[4], double const Etheta[4])
	Set or re-set the initial condition prior to integration. More...

void	setInitialCondition (SmartPointer< Metric::Generic > gg, const double coord[8], const int dir)
	Set or re-set the initial condition prior to integration. More...

size_t	getImin () const
	Get imin_.

size_t	getImax () const
	Get imax_.

size_t	getI0 () const
	Get i0_.

void	initCoord (std::vector< double > const &)

std::vector< double >	initCoord () const

virtual void	setInitCoord (const double coord[8], int dir, double const Ephi[4], double const Etheta[4])
	Set Initial coordinate. More...

virtual void	setInitCoord (const double coord[8], int dir=0)
	Set Initial coordinate. More...

virtual void	setInitCoord (double const pos[4], double const vel[3], int dir=0)
	Set initial coordinate. More...

virtual void	setPosition (double const pos[4])
	Set initial 4-position.

virtual void	setVelocity (double const vel[3])
	Set initial 3-velocity.

void	reset ()
	Forget integration, keeping initial contition.

void	reInit ()
	Reset and recompute particle properties.

void	integrator (std::string const &type)
	Set the integrator. More...

std::string	integrator () const
	Describe the integrator used by state_.

double	deltaMin () const
	Get delta_min_.

void	deltaMin (double h1)
	Set delta_min_.

double	deltaMax () const
	Get delta_max_.

virtual double	deltaMax (double const pos[8], double delta_max_external) const

void	deltaMax (double h1)

void	absTol (double)
	Set abstol_.

double	absTol () const
	Get abstol_.

void	relTol (double)
	Set reltol_.

double	relTol () const
	Get reltol_.

double	deltaMaxOverR () const
	Get delta_max_over_r_.

void	deltaMaxOverR (double t)
	Set delta_max_over_r_.

void	delta (const double delta)
	Expand memory slots for polarization vectors. More...

void	delta (double, const std::string &unit)
	Set delta_ in specified units.

double	delta () const
	Get delta_.

double	delta (const std::string &unit) const
	Get delta_ in specified units.

double	tMin () const
	Get tmin_.

double	tMin (const std::string &unit) const
	Get tmin_ in specified unit.

void	tMin (double tlim)
	Set tmin_.

void	tMin (double, const std::string &unit)
	Set tmin_ in specified unit.

void	adaptive (bool mode)
	Set adaptive_.

bool	adaptive () const
	Get adaptive_.

void	secondary (bool sec)
	Set secondary_.

bool	secondary () const
	Get secondary_.

void	parallelTransport (bool pt)
	Set parallel_transport_.

bool	parallelTransport () const
	Get parallel_transport_.

void	maxiter (size_t miter)
	Set maxiter_.

size_t	maxiter () const
	Get maxiter_.

double const *	getCst () const
	Returns the worldline's cst of motion (if any) More...

void	setCst (double const *cst, size_t const ncsts)
	Set Metric-specific constants of motion. More...

void	getInitialCoord (std::vector< double > &dest) const
	Get initial coordinates + base vectors. More...

void	getCoord (size_t index, Gyoto::state_t &dest) const
	Get coordinates+base vectors corresponding to index. More...

void	getCoord (size_t index, Gyoto::state_t &dest)
	Get coordinates+base vectors corresponding to index. More...

void	getCoord (double date, Gyoto::state_t &dest, bool proper=false)
	Get coordinates+base vectors corresponding to date dest[0]. More...

void	getCoord (double const const dates, size_t const n_dates, double const x1dest, double const x2dest, double const x3dest, double const x0dot=NULL, double const x1dot=NULL, double const x2dot=NULL, double const x3dot=NULL, double ep0=NULL, double ep1=NULL, double ep2=NULL, double ep3=NULL, double et0=NULL, double et1=NULL, double et2=NULL, double et3=NULL, double *otime=NULL, bool proper=false)
	Get 8-coordinates for specific dates. More...

void	getCoord (double x0, double x1, double x2, double x3) const
	Get all computed positions. More...

void	getCartesianPos (size_t index, double dest[4]) const
	Get Cartesian expression of 4-position at index.

virtual void	xStore (size_t ind, state_t const &coord, double tau)
	Store coord at index ind. More...

virtual void	xStore (size_t ind, state_t const &coord)=delete
	Obsolete, update your code.

virtual void	xStore (size_t ind, double const coord[8])=delete
	Obsolete, update your code.

virtual void	xFill (double tlim, bool proper=false)
	Fill x0, x1... by integrating the Worldline from previously set inittial condition to time tlim.

size_t	get_nelements () const
	Get number of computed dates.

void	get_t (double *dest) const
	Get computed dates.

void	get_tau (double *dest) const
	Get computed proper times or values of the affine parameter.

void	getCartesian (double const const dates, size_t const n_dates, double const x, double const y, double const z, double const xprime=NULL, double const yprime=NULL, double *const zprime=NULL)
	Get the 6 Cartesian coordinates for specific dates. More...

void	get_xyz (double x, double y, double *z) const
	Get 3-position in cartesian coordinates for computed dates.

void	checkPhiTheta (double coord[8]) const
	Bring θ in [0,Π] and φ in [0,2Π]. More...

void	getSkyPos (SmartPointer< Screen > screen, double dalpha, double ddellta, double *dD) const
	Get computed positions in sky coordinates.

void	get_dot (double x0dot, double x1dot, double x2dot, double x3dot) const
	Get computed 4-velocities.

void	get_prime (double x1prime, double x2prime, double *x3prime) const
	Get computed 3-velocities.

void	save_txyz (char *fichierxyz) const
	Save in a file.

void	save_txyz (char *const filename, double const t1, double const mass_sun, double const distance_kpc, std::string const unit, SmartPointer< Screen > sc=NULL)
	Save, converted.

void	incRefCount ()
	Increment the reference counter. Warning: Don't mess with the counter.

int	decRefCount ()
	Decrement the reference counter and return current value. Warning: Don't mess with the counter.

int	getRefCount ()
	Get the current number of references.

virtual bool	isThreadSafe () const
	Whether this class is thread-safe. More...

void	set (Property const &p, Value val)
	Set Value of a Property.

void	set (Property const &p, Value val, std::string const &unit)
	Set Value (expressed in unit) of a Property.

void	set (std::string const &pname, Value val)
	Set Value of a Property.

void	set (std::string const &pname, Value val, std::string const &unit)
	Set Value (expressed in unit) of a Property.

Value	get (Property const &p) const
	Get Value of a Property.

Value	get (std::string const &pname) const
	Get Value of a Property.

Value	get (Property const &p, std::string const &unit) const
	Get Value of a Property, converted to unit.

Value	get (std::string const &pname, std::string const &unit) const
	Get Value of a Property, converted to unit.

Property const *	property (std::string const pname) const
	Find property by name. More...

virtual void	fillProperty (Gyoto::FactoryMessenger *fmp, Property const &p) const
	Output a single Property to XML. More...

virtual void	fillElement (Gyoto::FactoryMessenger *fmp) const
	Fill the XML element for this Object. More...

virtual int	setParameter (std::string name, std::string content, std::string unit)
	Set parameter by name. More...

virtual void	setParameter (Gyoto::Property const &p, std::string const &name, std::string const &content, std::string const &unit)
	Set parameter by Property (and name) More...

std::string	describeProperty (Gyoto::Property const &p) const
	Format desrciption for a property. More...

void	help () const
	Print (to stdout) some help on this class. More...

Static Public Member Functions
static SmartPointer< Photon >	Subcontractor (Gyoto::FactoryMessenger *)

Public Attributes
	GYOTO_OBJECT_THREAD_SAFETY

	GYOTO_WORLDLINE

int	stopcond
	Whether and why integration is finished.

Static Public Attributes
static GYOTO_OBJECT Property const	properties []

Protected Member Functions
	Photon (Photon *orig, size_t i0, int dir, double step_max)
	Used by Photon::Refined::Refined()

virtual void	xAllocate ()
	Allocate x0, x1 etc. with default size. More...

virtual void	xAllocate (size_t size)
	Allocate x0, x1 etc. with a specified size. More...

virtual size_t	xExpand (int dir)
	Expand x0, x1 etc... to hold more elements. More...

virtual void	xExpand (double *&x, int dir)
	Expand one array to hold more elements. More...

virtual void	eAllocate ()
	Allocate ep0_ ... et3_. More...

virtual void	eDeallocate ()
	Deallocate ep0_ ... et3_. More...

virtual void	eExpand (int dir)

virtual void	tell (Gyoto::Hook::Teller *)
	This is how a Teller tells. More...

Protected Attributes
SmartPointer< Gyoto::Astrobj::Generic >	object_
	The astronomical target. More...

double	freq_obs_
	Photon's frequency in observer's frame. More...

double	transmission_freqobs_
	Integrated optical transmission. More...

SmartPointer< Spectrometer::Generic >	spectro_
	Observer's spectrometer. More...

double *	transmission_
	Integrated optical transmissions. More...

SmartPointer< Gyoto::Metric::Generic >	metric_
	The Gyoto::Metric in this part of the universe.

double *	tau_
	proper time or affine parameter

double *	x0_
	t or T

double *	x1_
	r or x

double *	x2_
	θ or y

double *	x3_
	φ or z

double *	x0dot_
	tdot or Tdot

double *	x1dot_
	rdot or xdot

double *	x2dot_
	θdot or ydot

double *	x3dot_
	φdot or zdot

double *	ep0_

double *	ep1_
	Coordinate of first base vector to parallel transport.

double *	ep2_
	Coordinate of first base vector to parallel transport.

double *	ep3_
	Coordinate of first base vector to parallel transport.

double *	et0_
	Coordinate of first base vector to parallel transport.

double *	et1_
	Coordinate of Second base vector to parallel transport.

double *	et2_
	Coordinate of Second base vector to parallel transport.

double *	et3_
	Coordinate of Second base vector to parallel transport.

size_t	x_size_
	Coordinate of Second base vector to parallel transport. More...

size_t	imin_
	Minimum index for which x0_, x1_... have been computed.

size_t	i0_
	Index of initial condition in array.

size_t	imax_
	Maximum index for which x0_, x1_... have been computed.

bool	adaptive_
	Whether integration should use adaptive delta.

bool	secondary_
	Experimental: choose 0 to compute only primary image. More...

bool	parallel_transport_
	Whether to parallel transport a local triad. More...

double	delta_
	Initial integrating step. More...

double	tmin_
	Time limit for the integration (geometrical units) More...

double *	cst_
	Worldline's csts of motion (if any)

size_t	cst_n_
	Number of constants of motion.

int	wait_pos_
	Hack in setParameters()

double *	init_vel_
	Hack in setParameters()

size_t	maxiter_
	Maximum number of iterations when integrating.

double	delta_min_
	Minimum integration step for the adaptive integrator. More...

double	delta_max_
	Maximum integration step for the adaptive integrator. More...

double	delta_max_over_r_
	Numerical tuning parameter. More...

double	abstol_
	Absolute tolerance of the integrator. More...

double	reltol_
	Absolute tolerance of the integrator. More...

SmartPointer< Worldline::IntegState::Generic >	state_
	An object to hold the integration state.

std::string	kind_
	The "kind" that is output in the XML entity. More...

std::vector< std::string >	plugins_
	The plug-ins that needs to be loaded to access this instance's class. More...

Private Member Functions
void	_allocateTransmission ()
	Allocate Photon::transmission_.

Private Attributes
int	refCount
	Reference counter.

pthread_mutex_t	mutex_
	A mutex. More...

Friends
class	Gyoto::SmartPointer< Gyoto::Photon >

Detailed Description

A null geodesic transporting light.

This is the central object for ray-tracing.

Member Typedef Documentation

◆ Subcontractor_t

typedef Gyoto::SmartPointer< Gyoto::SmartPointee > Gyoto::SmartPointee::Subcontractor_t(Gyoto::FactoryMessenger *, std::vector< std::string > const &)

inherited

A subcontractor builds an object upon order from the Factory.

Various classes need to provide a subcontractor to be able to instantiate themselves upon order from the Factory. A subcontractor is a function (often a static member function) which accepts a pointer to a FactoryMessenger as unique parameter, communicates with the Factory using this messenger to read an XML description of the object to build, and returns this objet. SmartPointee::Subcontractor_t* is just generic enough a typedef to cast to and from other subcontractor types: Astrobj::Subcontractor_t, Metric::Subcontractor_t, Spectrum::Subcontractor_t. A subcontractor needs to be registered using the relevant Register() function: Astrobj::Register(), Metric::Register(), Spectrum::Register().

Constructor & Destructor Documentation

◆ Photon()

Gyoto::Photon::Photon ( )

Default constructor.

Allocates the default size (GYOTO_DEFAULT_X_SIZE) for x1, x2 etc.

Member Function Documentation

◆ checkPhiTheta()

void Gyoto::Worldline::checkPhiTheta ( double coord[8] ) const

inherited

Bring θ in [0,Π] and φ in [0,2Π].

checkPhiTheta() Modifies coord if the corrdinates are spherical-like so that coord[2]=theta is in [0,pi] and coord[3]=phi is in [0,2pi]. Important to use in all astrobj in spherical coordinates to prevent "z-axis problems".

◆ className()

virtual std::string Gyoto::Photon::className ( ) const

virtual

"Photon"

Reimplemented from Gyoto::Worldline.

◆ className_l()

virtual std::string Gyoto::Photon::className_l ( ) const

virtual

"photon"

Reimplemented from Gyoto::Worldline.

◆ delta()

void Gyoto::Worldline::delta ( const double delta )

inherited

Expand memory slots for polarization vectors.

Assignment to another Worldline Set delta_

◆ deltaMax() [1/2]

virtual double Gyoto::Worldline::deltaMax	(	double const	pos[8],
		double	delta_max_external
	)		const

virtualinherited

Get delta max at a given position

Parameters

[in]	pos	4-position
[in]	delta_max_external	external constraint on delta_max

Returns: the smallest value between delta_max_, delta_max_external, and R*delta_max_over_r_ where R is pos[1] in spherical coordinates and max(x1, x2, x3) in Cartesian coordinates.

◆ deltaMax() [2/2]

void Gyoto::Worldline::deltaMax ( double h1 )

inherited

Set delta_max_

◆ describeProperty()

std::string Gyoto::Object::describeProperty ( Gyoto::Property const & p ) const

inherited

Format desrciption for a property.

Returns a string containing the name(s) and type of the property, as well as whether it supports unit.

◆ eAllocate()

virtual void Gyoto::Worldline::eAllocate ( )

protectedvirtualinherited

Allocate ep0_ ... et3_.

Allocate memory for polarization vectors

◆ eDeallocate()

virtual void Gyoto::Worldline::eDeallocate ( )

protectedvirtualinherited

Deallocate ep0_ ... et3_.

Deallocate memory for polarization vectors

◆ eExpand()

virtual void Gyoto::Worldline::eExpand ( int dir )

protectedvirtualinherited

Call xExpand(double * &x, int dir) on #ep0_, ep1_ etc.

◆ fillElement()

virtual void Gyoto::Object::fillElement ( Gyoto::FactoryMessenger * fmp ) const

virtualinherited

Fill the XML element for this Object.

The base implementation simply calls fillProperty() for each Property defined for the Object.

Derived classes should avoid overriding fillElement(). It may make sense occasionally, e.g. to make sure that the metric is output first.

To customize how a given Property is rendered, it is better to override fillProperty().

If this method is overridden, the implementation should in general call fillElement() on the direct base.

Reimplemented in Gyoto::Astrobj::Complex, Gyoto::Spectrometer::Complex, and Gyoto::Scenery.

◆ fillProperty()

virtual void Gyoto::Object::fillProperty	(	Gyoto::FactoryMessenger *	fmp,
		Property const &	p
	)		const

virtualinherited

Output a single Property to XML.

The base implementation decides what to do based on the p.type. The format matches how setParameters() an setParameter() would interpret the XML descition.

Overriding this method should be avoided, but makes sense in some cases (for instance Screen::fillProperty() selects a different unit for Distance based on its magnitude, so that stellar sizes are expressed in solar radii while smaller sizes can be expressed in meters and larger sizes in parsecs).

Overriding implementation should fall-back on calling the implementation in the direct parent class:

class A: public Object {};
class B: public A { 
 using B::setParameter;
 virtual void fillProperty(Gyoto::FactoryMessenger *fmp,
                        Property const &p) const ;
};
void B::fillProperty(Gyoto::FactoryMessenger *fmp,
                        Property const &p) const {
  if (name=="Duff") fmp->doSomething();
  else A::fillProperty(fmp, p);
}

Reimplemented in Gyoto::Scenery, Gyoto::Astrobj::DirectionalDisk, Gyoto::Astrobj::Disk3D, Gyoto::Astrobj::EquatorialHotSpot, Gyoto::Astrobj::NeutronStarModelAtmosphere, Gyoto::Astrobj::PatternDisk, Gyoto::Astrobj::PolishDoughnut, Gyoto::Screen, Gyoto::Astrobj::Star, Gyoto::Spectrometer::Uniform, and Gyoto::Astrobj::XillverReflection.

◆ findMin()

double Gyoto::Photon::findMin	(	Functor::Double_constDoubleArray *	object,
		double	t1,
		double	t2,
		double &	tmin,
		double	threshold = `DBL_MIN`
	)

Find minimum of photon–object distance.

Return the minimum of (*object)(this->getCoord()) between t1 and t2. The date of this minimum is returned in tmin.

Parameters

[in]	object	the distance to minimize is given by object->operator()(). This method is in particular implemented by the subclasses of Astrobj::Standard.
[in]	t1	date
[in]	t2	date
[out]	tmin	on output, date correspondig to the minimum
[in]	threshold	stop searching for a minimum if a value < threshold is found (very often, we just want to find a date below the threshold, not the accurate minimum).

◆ findValue()

void Gyoto::Photon::findValue	(	Functor::Double_constDoubleArray *	object,
		double	value,
		double	tinside,
		double &	toutside
	)

Find date for which the photon is at a given distance from the object.

Parameters

[in]	object	Object, must implement operator() (e.g. Astrobj::Standard, ThinDisk::Standard)
[in]	value	The value to find
[in]	tinside	A date for which object->Astrobj::operator()(Photon::getCoord()) is < value
[in,out]	toutside	On input: a date for which object->Astrobj::operator()(Photon::getCoord()) is > value. on output, (*object)(getCoord(toutside)) is < value, very close to value. toutside is closer to tinside on output than on input.

◆ getCartesian()

void Gyoto::Worldline::getCartesian	(	double const *const	dates,
		size_t const	n_dates,
		double *const	x,
		double *const	y,
		double *const	z,
		double *const	xprime = `NULL`,
		double *const	yprime = `NULL`,
		double *const	zprime = `NULL`
	)

inherited

Get the 6 Cartesian coordinates for specific dates.

The 6 coordinates (x, y, z, dx/dt, dy/dt, dz/dt) will be computed using the integrator and interpolated if necessary, so they will be as accurate as possible. Transforming to Cartesian coordinates is not necessarily meaningful.

Parameters

[in]	dates	List of dates for which the coordinates are to be computed;
[in]	n_dates	Number of dates to compute ;
[out]	x,y,z,xprime,yprime,zprime	Arrays in which to store the result. These pointer may be set to NULL to retrieve only part of the information. Else, they must be pre-allocated.

◆ getCoord() [1/5]

void Gyoto::Worldline::getCoord	(	double *	x0,
		double *	x1,
		double *	x2,
		double *	x3
	)		const

inherited

Get all computed positions.

Get all the pre-computed 8 coordinates (e.g. thanks to a prior call to xFill()) of this worldline.

◆ getCoord() [2/5]

void Gyoto::Worldline::getCoord	(	double const *const	dates,
		size_t const	n_dates,
		double *const	x1dest,
		double *const	x2dest,
		double *const	x3dest,
		double *const	x0dot = `NULL`,
		double *const	x1dot = `NULL`,
		double *const	x2dot = `NULL`,
		double *const	x3dot = `NULL`,
		double *	ep0 = `NULL`,
		double *	ep1 = `NULL`,
		double *	ep2 = `NULL`,
		double *	ep3 = `NULL`,
		double *	et0 = `NULL`,
		double *	et1 = `NULL`,
		double *	et2 = `NULL`,
		double *	et3 = `NULL`,
		double *	otime = `NULL`,
		bool	proper = `false`
	)

inherited

Get 8-coordinates for specific dates.

The coordinates will be computed using the integrator, so they will be as accurate as possible. Some heuristics are used to speed up the process and it is presumably faster to call this routine with a sorted list of dates. The line will be integrated further as required. An error will be thrown if it is not possible to reach a certain date.

Parameters

[in]	dates	the list of dates for which the coordinates are to be computed in proper time or affine parameter if #proper is true or in coordinate time if #proper is false (default);
[in]	n_dates	the number of dates to compute ;
[out]	x1dest,x2dest,x3dest,x0dot,x1dot,x2dot,x3dot	arrays in which to store the result. These pointer may be set to NULL to retrieve only part of the information. They must be pre-allocated.
[out]	ephi0,ephi1,ephi2,ephi3,etheta0,etheta1,etheta2,etheta3	arrays in which to store the ephi and etheta (parallel transport case). These pointer may be set to NULL to retrieve only part of the information. They must be pre-allocated.
[out]	otime	array in which to store the other time: coordinate time if #proper, else proper time or affine parameter.
[in]	proper	bool: whether #dates is proper time (or affine parameter) or coordinate time.

◆ getCoord() [3/5]

void Gyoto::Worldline::getCoord	(	double	date,
		Gyoto::state_t &	dest,
		bool	proper = `false`
	)

inherited

Get coordinates+base vectors corresponding to date dest[0].

Depending on the value of parallel_transport_, get position (xi_), velocity (xidot_) and possibly other triad vectors (epi_ and eti_). coord is resized to the right number of elements.

◆ getCoord() [4/5]

void Gyoto::Worldline::getCoord	(	size_t	index,
		Gyoto::state_t &	dest
	)

inherited

Get coordinates+base vectors corresponding to index.

We need this non-const implementation to allow the const, size_t and the non-const, double implementations to coexist.

◆ getCoord() [5/5]

void Gyoto::Worldline::getCoord	(	size_t	index,
		Gyoto::state_t &	dest
	)		const

inherited

Get coordinates+base vectors corresponding to index.

Depending on the value of parallel_transport_, get position (xi_), velocity (xidot_) and possibly other triad vectors (epi_ and eti_). coord is resized to the right number of elements.

◆ getCst()

double const * Gyoto::Worldline::getCst ( ) const

inherited

Returns the worldline's cst of motion (if any)

Return pointer to array holding the previously set Metric-specific constants of motion

◆ getInitialCoord()

void Gyoto::Worldline::getInitialCoord ( std::vector< double > & dest ) const

inherited

Get initial coordinates + base vectors.

Depending on the size of dest and on the value of parallel_transport_, get position (xi_), velocity (xidot_) and possibly other triad vectors (epi_ and eti_).

◆ getMass()

virtual double Gyoto::Photon::getMass ( ) const

virtual

Return 0.

Implements Gyoto::Worldline.

◆ getProperties()

virtual Property const * Gyoto::Photon::getProperties ( ) const

virtual

Get list of properties.

This method is declared automatically by the GYOTO_OBJECT macro and defined automatically by the GYOTO_PROPERTY_END macro.

Reimplemented from Gyoto::Object.

◆ getTransmission() [1/2]

double const * Gyoto::Photon::getTransmission ( ) const

Get Photon::transmission_.

getTansmission()[i] == getTransmission(size_t i)

◆ getTransmission() [2/2]

double Gyoto::Photon::getTransmission ( size_t i ) const

Get transmission.

Get either Photon::transmission_freqobs_ (with i=-1) or Photon::transmission_[i].

Parameters

i	channel number of the requested frequency, -1 for Photon::freq_obs_.

◆ getTransmissionMax()

double Gyoto::Photon::getTransmissionMax ( ) const

Get maximum transmission;.

Get current maximum of all the transmissions, Photon::transmission_freqobs_ or one elements of the Photon::transmission_ array.

◆ help()

void Gyoto::Object::help ( ) const

inherited

Print (to stdout) some help on this class.

Describe all properties that this instance supports.

◆ hit()

int Gyoto::Photon::hit ( Astrobj::Properties * data = NULL )

Integrate the geodesic.

Parameters

[in,out] data Optional Astrobj::Properties to fill with observational quantities.

Returns: 1 if object was hit, else 0.

◆ integrator()

void Gyoto::Worldline::integrator ( std::string const & type )

inherited

Set the integrator.

Initialize state_ to use the required integrator.

Parameters

[in] type Either "Legacy" or (if GYOTO_HAVE_BOOST_INTEGRATORS) one of "runge_kutta_cash_karp54", "runge_kutta_fehlberg78", "runge_kutta_dopri5", "runge_kutta_cash_karp54_classic"

◆ isThreadSafe()

virtual bool Gyoto::Object::isThreadSafe ( ) const

virtualinherited

Whether this class is thread-safe.

Return True if this object is thread-safe, i.e. if an instance and its clone can be used in parallel threads (in the context of Scenery::raytrace()). Known objects which are not thread-safe include Lorene metrics and everything from the Python plug-in.

The default implementation considers that the class itself is thread safe and recurses into the declared properties to check whether they are safe too. Classes that abide to the Object/Property paradigm and are themselves thread-safe have nothing special to do.

Objects that clone children in their copy constructor that are not declared as properties must take these children into account.

Classes that are never thread-safe must declare it. It acn be easily done using GYOTO_OBJECT_THREAD_SAFETY in the class declaration and GYOTO_PROPERTY_THREAD_UNSAFE in the class definition.

◆ property()

Property const * Gyoto::Object::property ( std::string const pname ) const

inherited

Find property by name.

Look into the Property list for a Property whose name (or name_false, for a boolean Property) is pname. Return a const pointer to the first such property found, or NULL if none is found.

◆ setCst()

void Gyoto::Worldline::setCst	(	double const *	cst,
		size_t const	ncsts
	)

inherited

Set Metric-specific constants of motion.

The will (re)allocate Worldline::cst_, copy cst into it, and set Worldline::cst_n_.

◆ setInitCoord() [1/3]

virtual void Gyoto::Worldline::setInitCoord	(	const double	coord[8],
		int	dir,
		double const	Ephi[4],
		double const	Etheta[4]
	)

virtualinherited

Set Initial coordinate.

Set imin_=imax_=i0_, and x[i0]=coord[].

If dir==1, i0_ is set to 0. If dir==-1, i0_ is set to x_size_-1.

If dir==0 and the Worldine has never been computed (i0_==0, imin_==1 and imax_==0), then dir defaults to 1 for a massive particle and -1 for a massless particle.

If dir==0 and the Worldine has already been computed, i0_ is not changed.

Parameters

coord new initial coordinates

dir direction of integration. 1 for forward integration, -1 for backards integration, 0 for unknown or both

Ephi initial value of base vector to parallel-transport. Ignored if parallel_transport_ is false.

Etheta initial value of base vector to parallel-transport. Ignored if parallel_transport_ is false.

◆ setInitCoord() [2/3]

virtual void Gyoto::Worldline::setInitCoord	(	const double	coord[8],
		int	dir = `0`
	)

virtualinherited

Set Initial coordinate.

Set imin_=imax_=i0_, and x[i0]=coord[].

If dir==1, i0_ is set to 0. If dir==-1, i0_ is set to x_size_-1.

If dir==0 and the Worldine has never been computed (i0_==0, imin_==1 and imax_==0), then dir defaults to 1 for a massive particle and -1 for a massless particle.

If dir==0 and the Worldine has already been computed, i0_ is not changed.

Parameters

coord new initial coordinates

dir direction of integration. 1 for forward integration, -1 for backards integration, 0 for unknown or both

Reimplemented in Gyoto::Astrobj::StarTrace.

◆ setInitCoord() [3/3]

virtual void Gyoto::Worldline::setInitCoord	(	double const	pos[4],
		double const	vel[3],
		int	dir = `0`
	)

virtualinherited

Set initial coordinate.

Parameters

pos	initial 4-position
vel	initial 3-velocity
dir	direction of integration