#include "sky_float3.h"
#include "sky_model.h"

Functions
static float3	geographical_to_direction (float lat, float lon)

static float3	spec_to_xyz (const float *spectrum)

static float	density_rayleigh (float height)

static float	density_mie (float height)

static float	density_ozone (float height)

static float	phase_rayleigh (float mu)

static float	phase_mie (float mu)

static bool	surface_intersection (float3 pos, float3 dir)

static float3	atmosphere_intersection (float3 pos, float3 dir)

static float3	ray_optical_depth (float3 ray_origin, float3 ray_dir)

static void	single_scattering (float3 ray_dir, float3 sun_dir, float3 ray_origin, float air_density, float dust_density, float ozone_density, float *r_spectrum)

void	SKY_nishita_skymodel_precompute_texture (float *pixels, int stride, int start_y, int end_y, int width, int height, float sun_elevation, float altitude, float air_density, float dust_density, float ozone_density)

static void	sun_radiation (float3 cam_dir, float altitude, float air_density, float dust_density, float solid_angle, float *r_spectrum)

void	SKY_nishita_skymodel_precompute_sun (float sun_elevation, float angular_diameter, float altitude, float air_density, float dust_density, float r_pixel_bottom, float r_pixel_top)

Variables
static const float	rayleigh_scale = 8e3f

static const float	mie_scale = 1.2e3f

static const float	mie_coeff = 2e-5f

static const float	mie_G = 0.76f

static const float	sqr_G = mie_G * mie_G

static const float	earth_radius = 6360e3f

static const float	atmosphere_radius = 6420e3f

static const int	steps = 32

static const int	steps_light = 16

static const int	num_wavelengths = 21

static const int	min_wavelength = 380

static const int	max_wavelength = 780

static const float	step_lambda = (max_wavelength - min_wavelength) / (num_wavelengths - 1)

static const float	irradiance []

static const float	rayleigh_coeff []

static const float	ozone_coeff []

static const float	cmf_xyz [][3]

Function Documentation

◆ atmosphere_intersection()

static float3 atmosphere_intersection	(	float3	pos,
		float3	dir
	)

static

Definition at line 150 of file sky_nishita.cpp.

References atmosphere_radius, Freestyle::c, dot(), len_squared(), make_float3, pos, sqr(), sqrtf, t, float3::x, float3::y, and float3::z.

Referenced by ray_optical_depth(), and single_scattering().

◆ density_mie()

static float density_mie ( float height )

static

Definition at line 107 of file sky_nishita.cpp.

References expf, height, and mie_scale.

Referenced by ray_optical_depth(), and single_scattering().

◆ density_ozone()

static float density_ozone ( float height )

static

Definition at line 112 of file sky_nishita.cpp.

References height.

Referenced by ray_optical_depth(), and single_scattering().

◆ density_rayleigh()

static float density_rayleigh ( float height )

static

Definition at line 102 of file sky_nishita.cpp.

References expf, height, and rayleigh_scale.

Referenced by ray_optical_depth(), and single_scattering().

◆ geographical_to_direction()

static float3 geographical_to_direction	(	float	lat,
		float	lon
	)

static

Definition at line 85 of file sky_nishita.cpp.

References cosf, make_float3, and sinf.

Referenced by SKY_nishita_skymodel_precompute_sun(), and SKY_nishita_skymodel_precompute_texture().

◆ phase_mie()

static float phase_mie ( float mu )

static

Definition at line 129 of file sky_nishita.cpp.

References M_PI_F, mie_G, powf, sqr(), and sqr_G.

Referenced by single_scattering().

◆ phase_rayleigh()

static float phase_rayleigh ( float mu )

static

Definition at line 124 of file sky_nishita.cpp.

References M_PI_F, and sqr().

Referenced by single_scattering().

◆ ray_optical_depth()

static float3 ray_optical_depth	(	float3	ray_origin,
		float3	ray_dir
	)

static

Definition at line 158 of file sky_nishita.cpp.

References atmosphere_intersection(), density_mie(), density_ozone(), density_rayleigh(), distance(), earth_radius, height, len, make_float3, P(), and steps_light.

Referenced by single_scattering(), and sun_radiation().

◆ single_scattering()

static void single_scattering	(	float3	ray_dir,
		float3	sun_dir,
		float3	ray_origin,
		float	air_density,
		float	dust_density,
		float	ozone_density,
		float *	r_spectrum
	)

static

Definition at line 194 of file sky_nishita.cpp.

References atmosphere_intersection(), density_mie(), density_ozone(), density_rayleigh(), distance(), dot(), earth_radius, expf, height, irradiance, len, make_float3, mie_coeff, num_wavelengths, ozone_coeff, P(), phase_mie(), phase_rayleigh(), ray_optical_depth(), rayleigh_coeff, reduce_add(), steps, and surface_intersection().

Referenced by SKY_nishita_skymodel_precompute_texture().

◆ SKY_nishita_skymodel_precompute_sun()

void SKY_nishita_skymodel_precompute_sun	(	float	sun_elevation,
		float	angular_diameter,
		float	altitude,
		float	air_density,
		float	dust_density,
		float *	r_pixel_bottom,
		float *	r_pixel_top
	)

Definition at line 345 of file sky_nishita.cpp.

References bottom, cosf, geographical_to_direction(), M_2PI_F, num_wavelengths, spec_to_xyz(), sun_radiation(), top, float3::x, float3::y, and float3::z.

Referenced by sky_texture_precompute_nishita().

◆ SKY_nishita_skymodel_precompute_texture()

void SKY_nishita_skymodel_precompute_texture	(	float *	pixels,
		int	stride,
		int	start_y,
		int	end_y,
		int	width,
		int	height,
		float	sun_elevation,
		float	altitude,
		float	air_density,
		float	dust_density,
		float	ozone_density
	)

Definition at line 277 of file sky_nishita.cpp.

References earth_radius, geographical_to_direction(), height, M_2PI_F, M_PI_2_F, M_PI_F, make_float3, num_wavelengths, single_scattering(), spec_to_xyz(), sqr(), stride, width, float3::x, x, float3::y, y, and float3::z.

Referenced by SkyLoader::load_pixels().

◆ spec_to_xyz()

static float3 spec_to_xyz ( const float * spectrum )

static

Definition at line 90 of file sky_nishita.cpp.

References cmf_xyz, make_float3, num_wavelengths, step_lambda, float3::x, float3::y, and float3::z.

Referenced by SKY_nishita_skymodel_precompute_sun(), and SKY_nishita_skymodel_precompute_texture().

◆ sun_radiation()

static void sun_radiation	(	float3	cam_dir,
		float	altitude,
		float	air_density,
		float	dust_density,
		float	solid_angle,
		float *	r_spectrum
	)

static

Definition at line 326 of file sky_nishita.cpp.

References earth_radius, expf, irradiance, make_float3, mie_coeff, num_wavelengths, ray_optical_depth(), rayleigh_coeff, float3::x, and float3::y.

Referenced by SKY_nishita_skymodel_precompute_sun().

◆ surface_intersection()

static bool surface_intersection	(	float3	pos,
		float3	dir
	)

static

Definition at line 136 of file sky_nishita.cpp.

References Freestyle::c, dot(), earth_radius, len_squared(), pos, sqr(), t, and float3::z.

Referenced by single_scattering().

Variable Documentation

◆ atmosphere_radius

const float atmosphere_radius = 6420e3f

static

Definition at line 27 of file sky_nishita.cpp.

Referenced by atmosphere_intersection().

◆ cmf_xyz

const float cmf_xyz[][3]

static

Initial value:

= {{0.00136800000f, 0.00003900000f, 0.00645000100f},
                                   {0.01431000000f, 0.00039600000f, 0.06785001000f},
                                   {0.13438000000f, 0.00400000000f, 0.64560000000f},
                                   {0.34828000000f, 0.02300000000f, 1.74706000000f},
                                   {0.29080000000f, 0.06000000000f, 1.66920000000f},
                                   {0.09564000000f, 0.13902000000f, 0.81295010000f},
                                   {0.00490000000f, 0.32300000000f, 0.27200000000f},
                                   {0.06327000000f, 0.71000000000f, 0.07824999000f},
                                   {0.29040000000f, 0.95400000000f, 0.02030000000f},
                                   {0.59450000000f, 0.99500000000f, 0.00390000000f},
                                   {0.91630000000f, 0.87000000000f, 0.00165000100f},
                                   {1.06220000000f, 0.63100000000f, 0.00080000000f},
                                   {0.85444990000f, 0.38100000000f, 0.00019000000f},
                                   {0.44790000000f, 0.17500000000f, 0.00002000000f},
                                   {0.16490000000f, 0.06100000000f, 0.00000000000f},
                                   {0.04677000000f, 0.01700000000f, 0.00000000000f},
                                   {0.01135916000f, 0.00410200000f, 0.00000000000f},
                                   {0.00289932700f, 0.00104700000f, 0.00000000000f},
                                   {0.00069007860f, 0.00024920000f, 0.00000000000f},
                                   {0.00016615050f, 0.00006000000f, 0.00000000000f},
                                   {0.00004150994f, 0.00001499000f, 0.00000000000f}}

Definition at line 63 of file sky_nishita.cpp.

Referenced by spec_to_xyz().

◆ earth_radius

const float earth_radius = 6360e3f

static

Definition at line 26 of file sky_nishita.cpp.

Referenced by ray_optical_depth(), single_scattering(), SKY_nishita_skymodel_precompute_texture(), sun_radiation(), and surface_intersection().

◆ irradiance

const float irradiance[]

static

Initial value:

= {
45756829855592995315f, 1.56596305559738380175f, 1.65148449067670455293f,
71496242737209314555f, 1.75797983805020541226f, 1.78256407885924539336f,
79095108475838560302f, 1.78541550133410664714f, 1.76815554864306845317f,
74122069647250410362f, 1.70647127164943679389f, 1.66556087452739887134f,
61993437242451854274f, 1.57083597368892080581f, 1.51932335059305478886f,
46628494965214395407f, 1.41245852740172450623f, 1.35844961970384092709f,
30474913844739281998f, 1.25174963272610817455f, 1.19975998755420620867f}

Definition at line 36 of file sky_nishita.cpp.

Referenced by single_scattering(), and sun_radiation().

◆ max_wavelength

const int max_wavelength = 780

static

Definition at line 32 of file sky_nishita.cpp.

◆ mie_coeff

const float mie_coeff = 2e-5f

static

Definition at line 23 of file sky_nishita.cpp.

Referenced by single_scattering(), and sun_radiation().

◆ mie_G

const float mie_G = 0.76f

static

Definition at line 24 of file sky_nishita.cpp.

Referenced by phase_mie().

◆ mie_scale

const float mie_scale = 1.2e3f

static

Definition at line 22 of file sky_nishita.cpp.

Referenced by density_mie().

◆ min_wavelength

const int min_wavelength = 380

static

Definition at line 31 of file sky_nishita.cpp.

◆ num_wavelengths

const int num_wavelengths = 21

static

Definition at line 30 of file sky_nishita.cpp.

Referenced by single_scattering(), SKY_nishita_skymodel_precompute_sun(), SKY_nishita_skymodel_precompute_texture(), spec_to_xyz(), and sun_radiation().

◆ ozone_coeff

const float ozone_coeff[]

static

Initial value:

= {
00000000325126849861f, 0.00000000585395365047f, 0.00000001977191155085f,
00000007309568762914f, 0.00000020084561514287f, 0.00000040383958096161f,
00000063551335912363f, 0.00000096707041180970f, 0.00000154797400424410f,
00000209038647223331f, 0.00000246128056164565f, 0.00000273551299461512f,
00000215125863128643f, 0.00000159051840791988f, 0.00000112356197979857f,
00000073527551487574f, 0.00000046450130357806f, 0.00000033096079921048f,
00000022512612292678f, 0.00000014879129266490f, 0.00000016828623364192f}

Definition at line 54 of file sky_nishita.cpp.

Referenced by single_scattering().

◆ rayleigh_coeff

const float rayleigh_coeff[]

static

Initial value:

= {
00005424820087636473f, 0.00004418549866505454f, 0.00003635151910165377f,
00003017929012024763f, 0.00002526320226989157f, 0.00002130859310621843f,
00001809838025320633f, 0.00001547057129129042f, 0.00001330284977336850f,
00001150184784075764f, 0.00000999557429990163f, 0.00000872799973630707f,
00000765513700977967f, 0.00000674217203751443f, 0.00000596134125832052f,
00000529034598065810f, 0.00000471115687557433f, 0.00000420910481110487f,
00000377218381260133f, 0.00000339051255477280f, 0.00000305591531679811f}

Definition at line 45 of file sky_nishita.cpp.

Referenced by single_scattering(), and sun_radiation().

◆ rayleigh_scale

const float rayleigh_scale = 8e3f

static

Definition at line 21 of file sky_nishita.cpp.

Referenced by density_rayleigh().

◆ sqr_G

const float sqr_G = mie_G * mie_G

static

Definition at line 25 of file sky_nishita.cpp.

Referenced by phase_mie().

◆ step_lambda

const float step_lambda = (max_wavelength - min_wavelength) / (num_wavelengths - 1)

static

Definition at line 34 of file sky_nishita.cpp.

Referenced by spec_to_xyz().

◆ steps

const int steps = 32

static

Definition at line 28 of file sky_nishita.cpp.

Referenced by _bli_array_iter_spiral_square(), annotation_smooth_buffer(), BKE_gpencil_stroke_smooth(), BKE_gpencil_stroke_smooth_strength(), BKE_gpencil_stroke_smooth_thickness(), BKE_undosys_stack_limit_steps_and_memory(), bmo_spin_exec(), MapRangeSteppedFunction::call(), cloth_calc_helper_forces(), compress_reconstruct_steps(), create_reconstruct_steps_for_struct(), DNA_reconstruct_info_create(), do_makeDispListCurveTypes(), do_path_effectors(), draw_distortion(), draw_horizontal_scale_indicators(), draw_parallel_lines(), draw_vertical_scale_indicators(), dynamicPaint_doEffectStep(), dynamicPaint_doSmudge(), dynamicPaint_doStep(), dynamicPaint_doWaveStep(), dynamicPaint_prepareEffectStep(), ED_undo_push(), edbm_extrude_repeat_exec(), edbm_screw_exec(), edbm_spin_exec(), gpencil_smooth_buffer(), gpencil_stroke_simplify_fixed_exec(), gpencil_undo_push(), hair_ensure_procedural_data(), init_test_curve(), integrate_particle(), blender::nodes::map_range_float(), blender::nodes::map_range_float3(), blender::nodes::map_stepped(), NODE_DEFINE(), object_motion_steps(), reconstruct_struct(), BVH2::refit_primitives(), single_scattering(), btLemkeAlgorithm::solve(), svm_node_map_range(), ui_draw_gradient(), vertex_group_quantize_exec(), and vgroup_quantize_subset().

◆ steps_light

const int steps_light = 16

static

Definition at line 29 of file sky_nishita.cpp.

Referenced by ray_optical_depth().

Functions

Variables

Function Documentation

◆ atmosphere_intersection()

◆ density_mie()

◆ density_ozone()

◆ density_rayleigh()

◆ geographical_to_direction()

◆ phase_mie()

◆ phase_rayleigh()

◆ ray_optical_depth()

◆ single_scattering()

◆ SKY_nishita_skymodel_precompute_sun()

◆ SKY_nishita_skymodel_precompute_texture()

◆ spec_to_xyz()

◆ sun_radiation()

◆ surface_intersection()

Variable Documentation

◆ atmosphere_radius

◆ cmf_xyz

◆ earth_radius

◆ irradiance

◆ max_wavelength

◆ mie_coeff

◆ mie_G

◆ mie_scale

◆ min_wavelength

◆ num_wavelengths

◆ ozone_coeff

◆ rayleigh_coeff

◆ rayleigh_scale

◆ sqr_G

◆ step_lambda

◆ steps

◆ steps_light