Refraction Class Reference

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

#include <RefractionExtinction.hpp>

Public Member Functions
virtual void	forward (Vec3d &altAzPos) const
	Apply refraction. More...
virtual void	backward (Vec3d &altAzPos) const
	Remove refraction from position ("reduce"). More...
virtual void	forward (Vec3f &altAzPos) const
	Apply refraction. More...
virtual void	backward (Vec3f &altAzPos) const
	Remove refraction from position ("reduce"). More...
virtual void	combine (const Mat4d &m)
virtual Mat4d	getApproximateLinearTransfo () const
virtual StelProjector::ModelViewTranformP	clone () const
virtual bool	setupGLSLTransform (StelGLSLShader *shader)
	Attaches (or enables, if attached already) the GLSL transform shader to specified shader. More...
virtual void	setGLSLUniforms (StelGLSLShader *shader)
	Set GLSL uniforms needed for the transform shader. More...
virtual void	disableGLSLTransform (StelGLSLShader *shader)
	Disable the attached GLSL transform shader. More...
void	setPressure (float p_mbar)
	Set surface air pressure (mbars), influences refraction computation. More...
float	getPressure () const
void	setTemperature (float t_C)
	Set surface air temperature (degrees Celsius), influences refraction computation. More...
float	getTemperature () const
void	setPreTransfoMat (const Mat4d &m)
	Set the transformation matrices used to transform input vector to AltAz frame. More...
void	setPostTransfoMat (const Mat4d &m)

Detailed Description

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

Refraction solutions can only be aproximate, 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

Definition at line 102 of file RefractionExtinction.hpp.

Member Function Documentation

virtual void Refraction::backward ( Vec3d &  altAzPos ) const

virtual

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.

virtual void Refraction::backward ( Vec3f &  altAzPos ) const

virtual

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.

virtual void Refraction::disableGLSLTransform ( StelGLSLShader *  shader )

inlinevirtual

Disable the attached GLSL transform shader.

Implements StelProjector::ModelViewTranform.

Definition at line 223 of file RefractionExtinction.hpp.

virtual void Refraction::forward ( Vec3d &  altAzPos ) const

virtual

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.

virtual void Refraction::forward ( Vec3f &  altAzPos ) const

virtual

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.

virtual void Refraction::setGLSLUniforms ( StelGLSLShader *  shader )

inlinevirtual

Set GLSL uniforms needed for the transform shader.

Called by the renderer backend before drawing, if the transform shader was attached successfully.

Implements StelProjector::ModelViewTranform.

Definition at line 215 of file RefractionExtinction.hpp.

void Refraction::setPressure

(

float

p_mbar

)

Set surface air pressure (mbars), influences refraction computation.

void Refraction::setPreTransfoMat

(

const Mat4d &

m

)

Set the transformation matrices used to transform input vector to AltAz frame.

void Refraction::setTemperature

(

float

t_C

)

Set surface air temperature (degrees Celsius), influences refraction computation.

virtual bool Refraction::setupGLSLTransform ( StelGLSLShader *  shader )

inlinevirtual

Attaches (or enables, if attached already) the GLSL transform shader to specified shader.

The shader attached must implement one function:

vec4(modelViewForward(in vec4 v));

This function should implement the same logic as the forward() member function, except that it returns the result instead of modifying the parameter.

Parameters

shader

Shader to attach to.

Returns

true if the shader was succesfully attached, false otherwise.

Implements StelProjector::ModelViewTranform.

Definition at line 136 of file RefractionExtinction.hpp.

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

• core/RefractionExtinction.hpp