Refraction Class Reference

This class performs refraction computations, following literature from atmospheric optics and astronomy. More...

#include <RefractionExtinction.hpp>

Public Member Functions
void	forward (Vec3d &altAzPos) const override
	Apply refraction. More...
void	backward (Vec3d &altAzPos) const override
	Remove refraction from position ("reduce"). More...
void	forward (Vec3f &altAzPos) const override
	Apply refraction. More...
void	backward (Vec3f &altAzPos) const override
	Remove refraction from position ("reduce"). More...
void	combine (const Mat4d &m) override
Mat4d	getApproximateLinearTransfo () const override
QByteArray	getForwardTransformShader () const override
void	setForwardTransformUniforms (QOpenGLShaderProgram &program) const override
QByteArray	getBackwardTransformShader () const override
void	setBackwardTransformUniforms (QOpenGLShaderProgram &program) const override
StelProjector::ModelViewTranformP	clone () const override
void	setPressure (float p_mbar)
	Set surface air pressure (mbars), influences refraction computation.
float	getPressure () const
void	setTemperature (float t_C)
	Set surface air temperature (degrees Celsius), influences refraction computation.
float	getTemperature () const
void	setPreTransfoMat (const Mat4d &m)
	Set the transformation matrices used to transform input vector to AltAz frame.
void	setPostTransfoMat (const Mat4d &m)

Detailed Description

This class performs refraction computations, following literature from atmospheric optics and astronomy.

Refraction solutions can only be approximate, given the turbulent, unpredictable real atmosphere. Typical horizons do not go down below -1, so strange effects (distortion) between -2 and -5 should be covered. Note that forward/backward are no absolute reverse operations! All the computations should be in effect (1) only if atmosphere effects are true (2) only for celestial objects, never for landscape images (3) only for terrestrial locations, not on Moon/Mars/Saturn etc

Member Function Documentation

backward() [1/2]

void Refraction::backward ( Vec3d &  altAzPos ) const

overridevirtual

Remove refraction from position ("reduce").

Parameters

altAzPos

is the apparent star position vector, to be transformed into geometrical position. Note that forward/backward are no absolute reverse operations!

Implements StelProjector::ModelViewTranform.

backward() [2/2]

void Refraction::backward ( Vec3f &  altAzPos ) const

overridevirtual

Remove refraction from position ("reduce").

Parameters

altAzPos

is the apparent star position vector, to be transformed into geometrical position. Note that forward/backward are no absolute reverse operations!

Implements StelProjector::ModelViewTranform.

forward() [1/2]

void Refraction::forward ( Vec3d &  altAzPos ) const

overridevirtual

Apply refraction.

Parameters

altAzPos

is the geometrical star position vector, to be transformed into apparent position. Note that forward/backward are no absolute reverse operations!

Implements StelProjector::ModelViewTranform.

forward() [2/2]

void Refraction::forward ( Vec3f &  altAzPos ) const

overridevirtual

Apply refraction.

Parameters

altAzPos

is the geometrical star position vector, to be transformed into apparent position. Note that forward/backward are no absolute reverse operations!

Implements StelProjector::ModelViewTranform.