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Stellarium 0.12.3
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This class performs extinction computations, following literature from atmospheric optics and astronomy. More...
#include <RefractionExtinction.hpp>
Public Member Functions | |
void | forward (const Vec3d *altAzPos, float *mag, const int num=1) const |
Compute extinction effect for arrays of size. More... | |
void | forward (const Vec3f *altAzPos, float *mag, const int num=1) const |
void | forward (const double *sinAlt, float *mag, const int num) const |
void | forward (const float *sinAlt, float *mag, const int num) const |
void | forward (const double *sinAlt, float *mag) const |
void | forward (const float *sinAlt, float *mag) const |
void | backward (const Vec3d *altAzPos, float *mag, const int num=1) const |
Compute inverse extinction effect for arrays of size. More... | |
void | backward (const Vec3f *altAzPos, float *mag, const int num=1) const |
void | backward (const double *sinAlt, float *mag, const int num=1) const |
void | backward (const float *sinAlt, float *mag, const int num=1) const |
void | setExtinctionCoefficient (float k) |
Set visual extinction coefficient (mag/airmass), influences extinction computation. More... | |
float | getExtinctionCoefficient () const |
This class performs extinction computations, following literature from atmospheric optics and astronomy.
Airmass computations are limited to meaningful altitudes. The solution provided here will [hopefully!] result in a visible "zone of avoidance" near the horizon down to altitude -2, and may show stars in their full brightness below -2 degrees. Typical horizons do not go down below -1, so all natural sites 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 terrestrial locations, not on Moon/Mars/Saturn etc config.ini:astro/flag_extinction_below_horizon=true|false controls if extinction kills objects below -2 degrees altitude by setting airmass to 42.
Definition at line 45 of file RefractionExtinction.hpp.
void Extinction::backward | ( | const Vec3d * | altAzPos, |
float * | mag, | ||
const int | num = 1 |
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) | const |
Compute inverse extinction effect for arrays of size.
num | position vectors and magnitudes. |
altAzPos | are the NORMALIZED (!!) (apparent) star position vectors, and their z components sin(apparent_altitude). |
mag | the magnitudes Note that forward/backward are no absolute reverse operations! |
void Extinction::forward | ( | const Vec3d * | altAzPos, |
float * | mag, | ||
const int | num = 1 |
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) | const |
Compute extinction effect for arrays of size.
num | position vectors and magnitudes. |
altAzPos | are the NORMALIZED (!!) (apparent) star position vectors, and their z components sin(apparent_altitude). |
mag | the magnitudes This call must therefore be done after application of Refraction, and only if atmospheric effects are on. Note that forward/backward are no absolute reverse operations! |
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inline |
Set visual extinction coefficient (mag/airmass), influences extinction computation.
k= | 0.1 for highest mountains, 0.2 for very good lowland locations, 0.35 for typical lowland, 0.5 in humid climates. |
Definition at line 72 of file RefractionExtinction.hpp.