Integrate skylight model. Work in progress.
castano
12 years ago
parent
20c5078e93
commit
0eb7c3eb71
@ -0,0 +1,376 @@
|
||||
/*
|
||||
This source is published under the following 3-clause BSD license.
|
||||
|
||||
Copyright (c) 2012, Lukas Hosek and Alexander Wilkie
|
||||
All rights reserved.
|
||||
|
||||
Redistribution and use in source and binary forms, with or without
|
||||
modification, are permitted provided that the following conditions are met:
|
||||
|
||||
* Redistributions of source code must retain the above copyright
|
||||
notice, this list of conditions and the following disclaimer.
|
||||
* Redistributions in binary form must reproduce the above copyright
|
||||
notice, this list of conditions and the following disclaimer in the
|
||||
documentation and/or other materials provided with the distribution.
|
||||
* None of the names of the contributors may be used to endorse or promote
|
||||
products derived from this software without specific prior written
|
||||
permission.
|
||||
|
||||
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
||||
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||||
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
||||
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||||
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
/* ============================================================================
|
||||
|
||||
This file is part of a sample implementation of the analytical skylight model
|
||||
presented in the SIGGRAPH 2012 paper
|
||||
|
||||
|
||||
"An Analytic Model for Full Spectral Sky-Dome Radiance"
|
||||
|
||||
by
|
||||
|
||||
Lukas Hosek and Alexander Wilkie
|
||||
Charles University in Prague, Czech Republic
|
||||
|
||||
|
||||
Version: 1.0, May 11th, 2012
|
||||
|
||||
|
||||
Please visit http://cgg.mff.cuni.cz/projects/SkylightModelling/ to check if
|
||||
an updated version of this code has been published!
|
||||
|
||||
============================================================================ */
|
||||
|
||||
/*
|
||||
|
||||
All instructions on how to use this code are to be found in the accompanying
|
||||
header file.
|
||||
|
||||
*/
|
||||
|
||||
#include "ArHosekSkyModel.h"
|
||||
#include "ArHosekSkyModelData.h"
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <math.h>
|
||||
|
||||
// Some macro definitions that occur elsewhere in ART, and that have to be
|
||||
// replicated to make this a stand-alone module.
|
||||
|
||||
#ifndef NIL
|
||||
#define NIL 0
|
||||
#endif
|
||||
|
||||
#ifndef MATH_PI
|
||||
#define MATH_PI 3.141593
|
||||
#endif
|
||||
|
||||
#ifndef ALLOC
|
||||
#define ALLOC(_struct) ((_struct *)malloc(sizeof(_struct)))
|
||||
#endif
|
||||
|
||||
// internal definitions
|
||||
|
||||
typedef double *ArHosekSkyModel_Dataset;
|
||||
typedef double *ArHosekSkyModel_Radiance_Dataset;
|
||||
|
||||
// internal functions
|
||||
|
||||
void ArHosekSkyModel_CookConfiguration(
|
||||
ArHosekSkyModel_Dataset dataset,
|
||||
ArHosekSkyModelConfiguration config,
|
||||
double turbidity,
|
||||
double albedo,
|
||||
double solar_elevation
|
||||
)
|
||||
{
|
||||
double * elev_matrix;
|
||||
|
||||
int int_turbidity = turbidity;
|
||||
double turbidity_rem = turbidity - (double)int_turbidity;
|
||||
|
||||
solar_elevation = pow(solar_elevation / (MATH_PI / 2.0), (1.0 / 3.0));
|
||||
|
||||
// alb 0 low turb
|
||||
|
||||
elev_matrix = dataset + ( 9 * 6 * (int_turbidity-1) );
|
||||
|
||||
|
||||
for( unsigned int i = 0; i < 9; ++i )
|
||||
{
|
||||
//(1-t).^3* A1 + 3*(1-t).^2.*t * A2 + 3*(1-t) .* t .^ 2 * A3 + t.^3 * A4;
|
||||
config[i] =
|
||||
(1.0-albedo) * (1.0 - turbidity_rem)
|
||||
* ( pow(1.0-solar_elevation, 5.0) * elev_matrix[i] +
|
||||
5.0 * pow(1.0-solar_elevation, 4.0) * solar_elevation * elev_matrix[i+9] +
|
||||
10.0*pow(1.0-solar_elevation, 3.0)*pow(solar_elevation, 2.0) * elev_matrix[i+18] +
|
||||
10.0*pow(1.0-solar_elevation, 2.0)*pow(solar_elevation, 3.0) * elev_matrix[i+27] +
|
||||
5.0*(1.0-solar_elevation)*pow(solar_elevation, 4.0) * elev_matrix[i+36] +
|
||||
pow(solar_elevation, 5.0) * elev_matrix[i+45]);
|
||||
}
|
||||
|
||||
// alb 1 low turb
|
||||
elev_matrix = dataset + (9*6*10 + 9*6*(int_turbidity-1));
|
||||
for(unsigned int i = 0; i < 9; ++i)
|
||||
{
|
||||
//(1-t).^3* A1 + 3*(1-t).^2.*t * A2 + 3*(1-t) .* t .^ 2 * A3 + t.^3 * A4;
|
||||
config[i] +=
|
||||
(albedo) * (1.0 - turbidity_rem)
|
||||
* ( pow(1.0-solar_elevation, 5.0) * elev_matrix[i] +
|
||||
5.0 * pow(1.0-solar_elevation, 4.0) * solar_elevation * elev_matrix[i+9] +
|
||||
10.0*pow(1.0-solar_elevation, 3.0)*pow(solar_elevation, 2.0) * elev_matrix[i+18] +
|
||||
10.0*pow(1.0-solar_elevation, 2.0)*pow(solar_elevation, 3.0) * elev_matrix[i+27] +
|
||||
5.0*(1.0-solar_elevation)*pow(solar_elevation, 4.0) * elev_matrix[i+36] +
|
||||
pow(solar_elevation, 5.0) * elev_matrix[i+45]);
|
||||
}
|
||||
|
||||
if(int_turbidity == 10)
|
||||
return;
|
||||
|
||||
// alb 0 high turb
|
||||
elev_matrix = dataset + (9*6*(int_turbidity));
|
||||
for(unsigned int i = 0; i < 9; ++i)
|
||||
{
|
||||
//(1-t).^3* A1 + 3*(1-t).^2.*t * A2 + 3*(1-t) .* t .^ 2 * A3 + t.^3 * A4;
|
||||
config[i] +=
|
||||
(1.0-albedo) * (turbidity_rem)
|
||||
* ( pow(1.0-solar_elevation, 5.0) * elev_matrix[i] +
|
||||
5.0 * pow(1.0-solar_elevation, 4.0) * solar_elevation * elev_matrix[i+9] +
|
||||
10.0*pow(1.0-solar_elevation, 3.0)*pow(solar_elevation, 2.0) * elev_matrix[i+18] +
|
||||
10.0*pow(1.0-solar_elevation, 2.0)*pow(solar_elevation, 3.0) * elev_matrix[i+27] +
|
||||
5.0*(1.0-solar_elevation)*pow(solar_elevation, 4.0) * elev_matrix[i+36] +
|
||||
pow(solar_elevation, 5.0) * elev_matrix[i+45]);
|
||||
}
|
||||
|
||||
// alb 1 high turb
|
||||
elev_matrix = dataset + (9*6*10 + 9*6*(int_turbidity));
|
||||
for(unsigned int i = 0; i < 9; ++i)
|
||||
{
|
||||
//(1-t).^3* A1 + 3*(1-t).^2.*t * A2 + 3*(1-t) .* t .^ 2 * A3 + t.^3 * A4;
|
||||
config[i] +=
|
||||
(albedo) * (turbidity_rem)
|
||||
* ( pow(1.0-solar_elevation, 5.0) * elev_matrix[i] +
|
||||
5.0 * pow(1.0-solar_elevation, 4.0) * solar_elevation * elev_matrix[i+9] +
|
||||
10.0*pow(1.0-solar_elevation, 3.0)*pow(solar_elevation, 2.0) * elev_matrix[i+18] +
|
||||
10.0*pow(1.0-solar_elevation, 2.0)*pow(solar_elevation, 3.0) * elev_matrix[i+27] +
|
||||
5.0*(1.0-solar_elevation)*pow(solar_elevation, 4.0) * elev_matrix[i+36] +
|
||||
pow(solar_elevation, 5.0) * elev_matrix[i+45]);
|
||||
}
|
||||
}
|
||||
|
||||
double ArHosekSkyModel_CookRadianceConfiguration(
|
||||
ArHosekSkyModel_Radiance_Dataset dataset,
|
||||
double turbidity,
|
||||
double albedo,
|
||||
double solar_elevation
|
||||
)
|
||||
{
|
||||
double* elev_matrix;
|
||||
|
||||
int int_turbidity = turbidity;
|
||||
double turbidity_rem = turbidity - (double)int_turbidity;
|
||||
double res;
|
||||
solar_elevation = pow(solar_elevation / (M_PI / 2.0), (1.0 / 3.0));
|
||||
|
||||
// alb 0 low turb
|
||||
elev_matrix = dataset + (6*(int_turbidity-1));
|
||||
//(1-t).^3* A1 + 3*(1-t).^2.*t * A2 + 3*(1-t) .* t .^ 2 * A3 + t.^3 * A4;
|
||||
res = (1.0-albedo) * (1.0 - turbidity_rem) *
|
||||
( pow(1.0-solar_elevation, 5.0) * elev_matrix[0] +
|
||||
5.0*pow(1.0-solar_elevation, 4.0)*solar_elevation * elev_matrix[1] +
|
||||
10.0*pow(1.0-solar_elevation, 3.0)*pow(solar_elevation, 2.0) * elev_matrix[2] +
|
||||
10.0*pow(1.0-solar_elevation, 2.0)*pow(solar_elevation, 3.0) * elev_matrix[3] +
|
||||
5.0*(1.0-solar_elevation)*pow(solar_elevation, 4.0) * elev_matrix[4] +
|
||||
pow(solar_elevation, 5.0) * elev_matrix[5]);
|
||||
|
||||
// alb 1 low turb
|
||||
elev_matrix = dataset + (6*10 + 6*(int_turbidity-1));
|
||||
//(1-t).^3* A1 + 3*(1-t).^2.*t * A2 + 3*(1-t) .* t .^ 2 * A3 + t.^3 * A4;
|
||||
res += (albedo) * (1.0 - turbidity_rem) *
|
||||
( pow(1.0-solar_elevation, 5.0) * elev_matrix[0] +
|
||||
5.0*pow(1.0-solar_elevation, 4.0)*solar_elevation * elev_matrix[1] +
|
||||
10.0*pow(1.0-solar_elevation, 3.0)*pow(solar_elevation, 2.0) * elev_matrix[2] +
|
||||
10.0*pow(1.0-solar_elevation, 2.0)*pow(solar_elevation, 3.0) * elev_matrix[3] +
|
||||
5.0*(1.0-solar_elevation)*pow(solar_elevation, 4.0) * elev_matrix[4] +
|
||||
pow(solar_elevation, 5.0) * elev_matrix[5]);
|
||||
if(int_turbidity == 10)
|
||||
return res;
|
||||
|
||||
// alb 0 high turb
|
||||
elev_matrix = dataset + (6*(int_turbidity));
|
||||
//(1-t).^3* A1 + 3*(1-t).^2.*t * A2 + 3*(1-t) .* t .^ 2 * A3 + t.^3 * A4;
|
||||
res += (1.0-albedo) * (turbidity_rem) *
|
||||
( pow(1.0-solar_elevation, 5.0) * elev_matrix[0] +
|
||||
5.0*pow(1.0-solar_elevation, 4.0)*solar_elevation * elev_matrix[1] +
|
||||
10.0*pow(1.0-solar_elevation, 3.0)*pow(solar_elevation, 2.0) * elev_matrix[2] +
|
||||
10.0*pow(1.0-solar_elevation, 2.0)*pow(solar_elevation, 3.0) * elev_matrix[3] +
|
||||
5.0*(1.0-solar_elevation)*pow(solar_elevation, 4.0) * elev_matrix[4] +
|
||||
pow(solar_elevation, 5.0) * elev_matrix[5]);
|
||||
|
||||
// alb 1 high turb
|
||||
elev_matrix = dataset + (6*10 + 6*(int_turbidity));
|
||||
//(1-t).^3* A1 + 3*(1-t).^2.*t * A2 + 3*(1-t) .* t .^ 2 * A3 + t.^3 * A4;
|
||||
res += (albedo) * (turbidity_rem) *
|
||||
( pow(1.0-solar_elevation, 5.0) * elev_matrix[0] +
|
||||
5.0*pow(1.0-solar_elevation, 4.0)*solar_elevation * elev_matrix[1] +
|
||||
10.0*pow(1.0-solar_elevation, 3.0)*pow(solar_elevation, 2.0) * elev_matrix[2] +
|
||||
10.0*pow(1.0-solar_elevation, 2.0)*pow(solar_elevation, 3.0) * elev_matrix[3] +
|
||||
5.0*(1.0-solar_elevation)*pow(solar_elevation, 4.0) * elev_matrix[4] +
|
||||
pow(solar_elevation, 5.0) * elev_matrix[5]);
|
||||
return res;
|
||||
}
|
||||
|
||||
double ArHosekSkyModel_GetRadianceInternal(
|
||||
ArHosekSkyModelConfiguration configuration,
|
||||
double theta,
|
||||
double gamma
|
||||
)
|
||||
{
|
||||
const double expM = exp(configuration[4] * gamma);
|
||||
const double rayM = cos(gamma)*cos(gamma);
|
||||
const double mieM = (1.0 + cos(gamma)*cos(gamma)) / pow((1.0 + configuration[8]*configuration[8] - 2.0*configuration[8]*cos(gamma)), 1.5);
|
||||
const double zenith = sqrt(cos(theta));
|
||||
|
||||
return (1.0 + configuration[0] * exp(configuration[1] / (cos(theta) + 0.01))) *
|
||||
(configuration[2] + configuration[3] * expM + configuration[5] * rayM + configuration[6] * mieM + configuration[7] * zenith);
|
||||
}
|
||||
|
||||
// spectral version
|
||||
|
||||
ArHosekSkyModelState * arhosekskymodelstate_alloc_init(
|
||||
const double turbidity,
|
||||
const double albedo,
|
||||
const double elevation
|
||||
)
|
||||
{
|
||||
ArHosekSkyModelState * state = ALLOC(ArHosekSkyModelState);
|
||||
|
||||
for( unsigned int wl = 0; wl < 11; ++wl )
|
||||
{
|
||||
ArHosekSkyModel_CookConfiguration(
|
||||
datasets[wl],
|
||||
state->configs[wl],
|
||||
turbidity,
|
||||
albedo,
|
||||
elevation
|
||||
);
|
||||
|
||||
state->radiances[wl] =
|
||||
ArHosekSkyModel_CookRadianceConfiguration(
|
||||
datasetsRad[wl],
|
||||
turbidity,
|
||||
albedo,
|
||||
elevation
|
||||
);
|
||||
}
|
||||
|
||||
return state;
|
||||
}
|
||||
|
||||
void arhosekskymodelstate_free(
|
||||
ArHosekSkyModelState * state
|
||||
)
|
||||
{
|
||||
free(state);
|
||||
}
|
||||
|
||||
double arhosekskymodel_radiance(
|
||||
ArHosekSkyModelState * state,
|
||||
double theta,
|
||||
double gamma,
|
||||
double wavelength
|
||||
)
|
||||
{
|
||||
int low_wl = (wavelength - 320.0 ) / 40.0;
|
||||
|
||||
double interp = fmod((wavelength - 320.0 ) / 40.0, 1.0);
|
||||
|
||||
double val_low =
|
||||
ArHosekSkyModel_GetRadianceInternal(
|
||||
state->configs[low_wl],
|
||||
theta,
|
||||
gamma
|
||||
)
|
||||
* state->radiances[low_wl];
|
||||
|
||||
if(interp < 1e-6)
|
||||
return val_low;
|
||||
|
||||
double result =
|
||||
(1.0 - interp)
|
||||
* val_low
|
||||
+ interp
|
||||
* ArHosekSkyModel_GetRadianceInternal(
|
||||
state->configs[low_wl+1],
|
||||
theta,
|
||||
gamma
|
||||
)
|
||||
* state->radiances[low_wl+1];
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
|
||||
// xyz version
|
||||
|
||||
ArHosekXYZSkyModelState * arhosek_xyz_skymodelstate_alloc_init(
|
||||
const double turbidity,
|
||||
const double albedo,
|
||||
const double elevation
|
||||
)
|
||||
{
|
||||
ArHosekXYZSkyModelState * state = ALLOC(ArHosekXYZSkyModelState);
|
||||
|
||||
for( unsigned int channel = 0; channel < 3; ++channel )
|
||||
{
|
||||
ArHosekSkyModel_CookConfiguration(
|
||||
datasetsXYZ[channel],
|
||||
state->configs[channel],
|
||||
turbidity,
|
||||
albedo,
|
||||
elevation
|
||||
);
|
||||
|
||||
state->radiances[channel] =
|
||||
ArHosekSkyModel_CookRadianceConfiguration(
|
||||
datasetsXYZRad[channel],
|
||||
turbidity,
|
||||
albedo,
|
||||
elevation
|
||||
);
|
||||
}
|
||||
|
||||
return state;
|
||||
}
|
||||
|
||||
void arhosek_xyz_skymodelstate_free(
|
||||
ArHosekXYZSkyModelState * state
|
||||
)
|
||||
{
|
||||
free(state);
|
||||
}
|
||||
|
||||
double arhosek_xyz_skymodel_radiance(
|
||||
ArHosekXYZSkyModelState * state,
|
||||
double theta,
|
||||
double gamma,
|
||||
int channel
|
||||
)
|
||||
{
|
||||
return
|
||||
ArHosekSkyModel_GetRadianceInternal(
|
||||
state->configs[channel],
|
||||
theta,
|
||||
gamma
|
||||
)
|
||||
* state->radiances[channel];
|
||||
}
|
||||
@ -0,0 +1,190 @@
|
||||
/*
|
||||
This source is published under the following 3-clause BSD license.
|
||||
|
||||
Copyright (c) 2012, Lukas Hosek and Alexander Wilkie
|
||||
All rights reserved.
|
||||
|
||||
Redistribution and use in source and binary forms, with or without
|
||||
modification, are permitted provided that the following conditions are met:
|
||||
|
||||
* Redistributions of source code must retain the above copyright
|
||||
notice, this list of conditions and the following disclaimer.
|
||||
* Redistributions in binary form must reproduce the above copyright
|
||||
notice, this list of conditions and the following disclaimer in the
|
||||
documentation and/or other materials provided with the distribution.
|
||||
* None of the names of the contributors may be used to endorse or promote
|
||||
products derived from this software without specific prior written
|
||||
permission.
|
||||
|
||||
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
||||
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||||
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
||||
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||||
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
|
||||
/* ============================================================================
|
||||
|
||||
This file is part of a sample implementation of the analytical skylight model
|
||||
presented in the SIGGRAPH 2012 paper
|
||||
|
||||
|
||||
"An Analytic Model for Full Spectral Sky-Dome Radiance"
|
||||
|
||||
by
|
||||
|
||||
Lukas Hosek and Alexander Wilkie
|
||||
Charles University in Prague, Czech Republic
|
||||
|
||||
|
||||
Version: 1.0, May 11th, 2012
|
||||
|
||||
|
||||
Please visit http://cgg.mff.cuni.cz/projects/SkylightModelling/ to check if
|
||||
an updated version of this code has been published!
|
||||
|
||||
============================================================================ */
|
||||
|
||||
|
||||
/*
|
||||
|
||||
This code is taken from ART, a rendering research system written in a
|
||||
mix of C99 / Objective C. Since ART is not a small system and is intended to
|
||||
be inter-operable with other libraries, and since C does not have namespaces,
|
||||
the structures and functions in ART all have to have the somewhat wordy
|
||||
canonical names that begin with Ar.../ar..., like those seen in this example.
|
||||
|
||||
Usage information:
|
||||
==================
|
||||
|
||||
|
||||
Model initialisation
|
||||
--------------------
|
||||
|
||||
A separate ArHosekSkyModelState has to be maintained for each spectral
|
||||
band you want to use the model for. So in a renderer with num_channels
|
||||
bands, you would need something like
|
||||
|
||||
ArHosekSkyModelState * skymodel_state[num_channels];
|
||||
|
||||
You then have to allocate these states. In the following code snippet, we
|
||||
assume that "albedo" is defined as
|
||||
|
||||
double albedo[num_channels];
|
||||
|
||||
with a ground albedo value between [0,1] for each channel. The solar elevation
|
||||
is given in radians.
|
||||
|
||||
for ( unsigned int i = 0; i < num_channels; i++ )
|
||||
skymodel_state[i] =
|
||||
arhosekskymodelstate_alloc_init(
|
||||
turbidity,
|
||||
albedo[i],
|
||||
solarElevation
|
||||
);
|
||||
|
||||
|
||||
Using the model to generate skydome samples
|
||||
-------------------------------------------
|
||||
|
||||
Generating a skydome radiance spectrum "skydome_result" for a given location
|
||||
on the skydome determined via the angles theta and gamma works as follows:
|
||||
|
||||
double skydome_result[num_channels];
|
||||
|
||||
for ( unsigned int i = 0; i < num_channels; i++ )
|
||||
skydome_result[i] =
|
||||
arhosekskymodel_radiance(
|
||||
skymodel_state[i],
|
||||
theta,
|
||||
gamma,
|
||||
channel_center[i]
|
||||
);
|
||||
|
||||
The variable "channel_center" is assumed to hold the channel center wavelengths
|
||||
for each of the num_channels samples of the spectrum we are building.
|
||||
|
||||
|
||||
Cleanup after use
|
||||
-----------------
|
||||
|
||||
After rendering is complete, the content of the sky model states should be
|
||||
disposed of via
|
||||
|
||||
for ( unsigned int i = 0; i < num_channels; i++ )
|
||||
arhosekskymodelstate_free( skymodel_state[i] );
|
||||
|
||||
|
||||
CIE XYZ Version of the Model
|
||||
----------------------------
|
||||
|
||||
Usage of the CIE XYZ version of the model is exactly the same, except that
|
||||
num_channels is of course always 3, and that ArHosekXYZSkyModelState and
|
||||
arhosek_xyz_skymodel_radiance() have to be used instead of their spectral
|
||||
counterparts.
|
||||
|
||||
*/
|
||||
|
||||
typedef double ArHosekSkyModelConfiguration[9];
|
||||
|
||||
|
||||
// Spectral version of the model
|
||||
|
||||
|
||||
typedef struct ArHosekSkyModelState
|
||||
{
|
||||
ArHosekSkyModelConfiguration configs[11];
|
||||
double radiances[11];
|
||||
}
|
||||
ArHosekSkyModelState;
|
||||
|
||||
ArHosekSkyModelState * arhosekskymodelstate_alloc_init(
|
||||
const double turbidity,
|
||||
const double albedo,
|
||||
const double elevation
|
||||
);
|
||||
|
||||
void arhosekskymodelstate_free(
|
||||
ArHosekSkyModelState * state
|
||||
);
|
||||
|
||||
double arhosekskymodel_radiance(
|
||||
ArHosekSkyModelState * state,
|
||||
double theta,
|
||||
double gamma,
|
||||
double wavelength
|
||||
);
|
||||
|
||||
|
||||
// CIE XYZ version
|
||||
|
||||
|
||||
typedef struct ArHosekXYZSkyModelState
|
||||
{
|
||||
ArHosekSkyModelConfiguration configs[3];
|
||||
double radiances[3];
|
||||
}
|
||||
ArHosekXYZSkyModelState;
|
||||
|
||||
ArHosekXYZSkyModelState * arhosek_xyz_skymodelstate_alloc_init(
|
||||
const double turbidity,
|
||||
const double albedo,
|
||||
const double elevation
|
||||
);
|
||||
|
||||
void arhosek_xyz_skymodelstate_free(
|
||||
ArHosekXYZSkyModelState * state
|
||||
);
|
||||
|
||||
double arhosek_xyz_skymodel_radiance(
|
||||
ArHosekXYZSkyModelState * state,
|
||||
double theta,
|
||||
double gamma,
|
||||
int channel
|
||||
);
|
||||
File diff suppressed because it is too large
Load Diff
@ -0,0 +1,33 @@
|
||||
The files in this archive are a sample implementation of the analytical
|
||||
skylight model presented in the SIGGRAPH 2012 paper
|
||||
|
||||
|
||||
"An Analytic Model for Full Spectral Sky-Dome Radiance"
|
||||
|
||||
by
|
||||
|
||||
Lukas Hosek and Alexander Wilkie
|
||||
Charles University in Prague, Czech Republic
|
||||
|
||||
|
||||
Version: 1.0, May 11th, 2012
|
||||
|
||||
|
||||
Please visit http://cgg.mff.cuni.cz/projects/SkylightModelling/ to check if
|
||||
an updated version of this code has been published!
|
||||
|
||||
|
||||
This archive contains the following files:
|
||||
|
||||
README.txt This file.
|
||||
|
||||
ArHosekSkyModel.h Header file for the reference functions. Their
|
||||
usage is explained there, and sample code for
|
||||
calling them is given.
|
||||
|
||||
ArHosekSkyModel.c Implementation of the functions.
|
||||
|
||||
ArHosekSkyModelData.h Coefficient data.
|
||||
|
||||
Please note that the source files are in C99, so that when e.g. compiling this
|
||||
code with gcc, you have to add the "-std=c99" or "-std=gnu99" flags.
|
||||
Loading…
Reference in New Issue