SkyMultipleScattering Class Reference

Public Member Functions
	SkyMultipleScattering (const float air_density, const float aerosol_density, const float ozone_density)
float4	get_transmittance (const float cos_theta, const float normalized_altitude) const
float4	get_inscattering (const float3 sun_dir, const float3 ray_origin, const float3 ray_dir, const float t_d) const
void	precompute_lut ()

Protected Member Functions
void	get_atmosphere_collision_coefficients (const float altitude, float4 &aerosol_absorption, float4 &aerosol_scattering, float4 &molecular_absorption, float4 &molecular_scattering) const
float4	lookup_multiscattering (float cos_theta, float normalized_height, float d) const
float4	lookup_transmittance (const float cos_theta, const float normalized_altitude) const
float4	lookup_transmittance_at_ground (const float cos_theta) const
float4	lookup_transmittance_to_sun (const float normalized_altitude) const

Protected Attributes
float4	transmittance_lut [TRANSMITTANCE_RES_Y][TRANSMITTANCE_RES_X]
float	air_density
float	aerosol_density
float	ozone_density

Detailed Description

Definition at line 122 of file sky_multiple_scattering.cpp.

Constructor & Destructor Documentation

SkyMultipleScattering()

SkyMultipleScattering::SkyMultipleScattering ( const float air_density, const float aerosol_density, const float ozone_density )

inline

Definition at line 124 of file sky_multiple_scattering.cpp.

References aerosol_density, air_density, and ozone_density.

Member Function Documentation

get_atmosphere_collision_coefficients()

void SkyMultipleScattering::get_atmosphere_collision_coefficients ( const float altitude, float4 & aerosol_absorption, float4 & aerosol_scattering, float4 & molecular_absorption, float4 & molecular_scattering ) const

inlineprotected

Definition at line 228 of file sky_multiple_scattering.cpp.

References AEROSOL_ABSORPTION_CROSS_SECTION, aerosol_density, AEROSOL_SCATTERING_CROSS_SECTION, air_density, get_aerosol_density(), get_molecular_absorption_coefficient(), get_molecular_scattering_coefficient(), and ozone_density.

Referenced by get_inscattering(), and get_transmittance().

get_inscattering()

float4 SkyMultipleScattering::get_inscattering ( const float3 sun_dir, const float3 ray_origin, const float3 ray_dir, const float t_d ) const

inline

Definition at line 161 of file sky_multiple_scattering.cpp.

References aerosol_phase_function(), ATMOSPHERE_THICKNESS, cos_theta(), dot(), EARTH_RADIUS, exp, fmaxf, get_atmosphere_collision_coefficients(), i, IN_SCATTERING_STEPS, float3::length(), lookup_multiscattering(), lookup_transmittance(), make_float4, max, molecular_phase_function(), and SUN_SPECTRAL_IRRADIANCE.

Referenced by SKY_multiple_scattering_precompute_texture().

get_transmittance()

float4 SkyMultipleScattering::get_transmittance ( const float cos_theta, const float normalized_altitude ) const

inline

Definition at line 132 of file sky_multiple_scattering.cpp.

References ATMOSPHERE_RADIUS, cos_theta(), EARTH_RADIUS, exp, fmaxf, get_atmosphere_collision_coefficients(), float3::length(), make_float3(), make_float4, mix, ray_sphere_intersection(), result, step, sun_direction(), and TRANSMITTANCE_STEPS.

Referenced by precompute_lut(), and SKY_multiple_scattering_precompute_sun().

lookup_multiscattering()

float4 SkyMultipleScattering::lookup_multiscattering ( float cos_theta, float normalized_height, float d ) const

inlineprotected

Definition at line 241 of file sky_multiple_scattering.cpp.

References cos_theta(), EARTH_RADIUS, expf, GROUND_ALBEDO, lookup_transmittance_at_ground(), lookup_transmittance_to_sun(), M_1_PI_F, M_2PI_F, make_float4, PHASE_ISOTROPIC, safe_sqrtf(), and sqr.

Referenced by get_inscattering().

lookup_transmittance()

float4 SkyMultipleScattering::lookup_transmittance ( const float cos_theta, const float normalized_altitude ) const

inlineprotected

Definition at line 261 of file sky_multiple_scattering.cpp.

References cos_theta(), float, min, mix, saturate, top, transmittance_lut, TRANSMITTANCE_RES_X, TRANSMITTANCE_RES_Y, v, x, and y.

Referenced by get_inscattering().

lookup_transmittance_at_ground()

float4 SkyMultipleScattering::lookup_transmittance_at_ground ( const float cos_theta ) const

inlineprotected

Definition at line 279 of file sky_multiple_scattering.cpp.

References cos_theta(), float, min, mix, saturate, transmittance_lut, TRANSMITTANCE_RES_X, x, and y.

Referenced by lookup_multiscattering().

lookup_transmittance_to_sun()

float4 SkyMultipleScattering::lookup_transmittance_to_sun ( const float normalized_altitude ) const

inlineprotected

Definition at line 290 of file sky_multiple_scattering.cpp.

References float, min, mix, saturate, transmittance_lut, TRANSMITTANCE_RES_X, TRANSMITTANCE_RES_Y, v, x, and y.

Referenced by lookup_multiscattering().

precompute_lut()

void SkyMultipleScattering::precompute_lut ( )

inline

Definition at line 208 of file sky_multiple_scattering.cpp.

References begin(), get_transmittance(), make_float2, SKY_parallel_for(), transmittance_lut, TRANSMITTANCE_RES_X, TRANSMITTANCE_RES_Y, float2::x, x, float2::y, and y.

Referenced by SKY_multiple_scattering_precompute_texture().

Member Data Documentation

aerosol_density

float SkyMultipleScattering::aerosol_density

protected

Definition at line 224 of file sky_multiple_scattering.cpp.

Referenced by get_atmosphere_collision_coefficients(), and SkyMultipleScattering().

air_density

float SkyMultipleScattering::air_density

protected

Definition at line 223 of file sky_multiple_scattering.cpp.

Referenced by get_atmosphere_collision_coefficients(), and SkyMultipleScattering().

ozone_density

float SkyMultipleScattering::ozone_density

protected

Definition at line 225 of file sky_multiple_scattering.cpp.

Referenced by get_atmosphere_collision_coefficients(), and SkyMultipleScattering().

transmittance_lut

float4 SkyMultipleScattering::transmittance_lut[TRANSMITTANCE_RES_Y][TRANSMITTANCE_RES_X]

protected

Definition at line 222 of file sky_multiple_scattering.cpp.

Referenced by lookup_transmittance(), lookup_transmittance_at_ground(), lookup_transmittance_to_sun(), and precompute_lut().

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

• sky_multiple_scattering.cpp