added a forgotten file
Wenzel Jakob
parent
cffde41f80
commit
7531f543d5
|
|
@ -0,0 +1,193 @@
|
||||||
|
/*
|
||||||
|
This file is part of Mitsuba, a physically based rendering system.
|
||||||
|
|
||||||
|
Copyright (c) 2007-2010 by Wenzel Jakob and others.
|
||||||
|
|
||||||
|
Mitsuba is free software; you can redistribute it and/or modify
|
||||||
|
it under the terms of the GNU General Public License Version 3
|
||||||
|
as published by the Free Software Foundation.
|
||||||
|
|
||||||
|
Mitsuba is distributed in the hope that it will be useful,
|
||||||
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
GNU General Public License for more details.
|
||||||
|
|
||||||
|
You should have received a copy of the GNU General Public License
|
||||||
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <mitsuba/render/scene.h>
|
||||||
|
#include <mitsuba/core/bitmap.h>
|
||||||
|
#include <mitsuba/core/plugin.h>
|
||||||
|
#include "sun.h"
|
||||||
|
|
||||||
|
MTS_NAMESPACE_BEGIN
|
||||||
|
|
||||||
|
/*!\plugin{sun}{Sun luminaire}
|
||||||
|
* \parameters{
|
||||||
|
* \parameter{turbidity}{\Float}{
|
||||||
|
* This parameter determines the amount of scattering particles (or
|
||||||
|
* `haze') in the atmosphere. Smaller values ($\sim 2$) produce a
|
||||||
|
* clear blue sky, larger values ($\sim 8$) lead to an overcast sky,
|
||||||
|
* and a very high values ($\sim 20$) cause a color shift towards
|
||||||
|
* orange and red. \default{3}
|
||||||
|
* }
|
||||||
|
* \parameter{day}{\Integer}{Solar day used to compute the sun's position.
|
||||||
|
* Must be in the range between 1 and 365. \default{180}}
|
||||||
|
* \parameter{time}{\Float}{Fractional time used to compute the sun's
|
||||||
|
* position. A time of 4:15 PM corresponds to 16.25. \default{15.00}}
|
||||||
|
* \parameter{latitude, longitude}{\Float}{
|
||||||
|
* These two parameters specify the oberver's latitude and longitude
|
||||||
|
* in degrees, which are required to compute the sun's position.
|
||||||
|
* \default{35.6894, 139.6917 --- Tokyo, Japan}
|
||||||
|
* }
|
||||||
|
* \parameter{standardMeridian}{\Integer}{Denotes the
|
||||||
|
* standard meridian of the time zone for finding
|
||||||
|
* the sun's position \default{135 --- Japan standard time}
|
||||||
|
* }
|
||||||
|
* \parameter{sunDirection}{\Vector}{Allows to manually
|
||||||
|
* override the sun direction in world space. When this value
|
||||||
|
* is provided, parameters pertaining to the computation
|
||||||
|
* of the sun direction (\code{day, time, latitude, longitude,}
|
||||||
|
* and \code{standardMeridian}) are unnecessary. \default{none}
|
||||||
|
* }
|
||||||
|
* \parameter{resolution}{\Integer}{Specifies the resolution of the precomputed
|
||||||
|
* image that is used to represent the sun environment map
|
||||||
|
* \default{256}}
|
||||||
|
* \parameter{sunScale}{\Float}{
|
||||||
|
* This parameter can be used to scale the the amount of illumination
|
||||||
|
* emitted by the sun luminaire, for instance to change its units. To
|
||||||
|
* switch from photometric ($\nicefrac{W}{m^2\cdot sr}$)
|
||||||
|
* to arbitrary but convenient units in the $[0,1]$ range, set
|
||||||
|
* this parameter to \code{1e-5}. \default{1}
|
||||||
|
* }
|
||||||
|
* }
|
||||||
|
*/
|
||||||
|
class SunLuminaire : public Luminaire {
|
||||||
|
public:
|
||||||
|
SunLuminaire(const Properties &props)
|
||||||
|
: Luminaire(props) {
|
||||||
|
m_scale = props.getFloat("sunScale", 1.0f);
|
||||||
|
m_resolution = props.getInteger("resolution", 512);
|
||||||
|
Point2 sunPos = configureSunPosition(props);
|
||||||
|
m_sunTheta = sunPos.x;
|
||||||
|
m_sunDir = toSphere(sunPos.x, sunPos.y);
|
||||||
|
m_sunDiskScale = props.getFloat("sunDiskScale", 15.0f);
|
||||||
|
m_turbidity = props.getFloat("turbidity", 3.0f);
|
||||||
|
}
|
||||||
|
|
||||||
|
SunLuminaire(Stream *stream, InstanceManager *manager)
|
||||||
|
: Luminaire(stream, manager) {
|
||||||
|
m_scale = stream->readFloat();
|
||||||
|
m_sunDiskScale = stream->readFloat();
|
||||||
|
m_sunTheta = stream->readFloat();
|
||||||
|
m_turbidity = stream->readFloat();
|
||||||
|
m_resolution = stream->readInt();
|
||||||
|
m_sunDir = Vector(stream);
|
||||||
|
configure();
|
||||||
|
}
|
||||||
|
|
||||||
|
void serialize(Stream *stream, InstanceManager *manager) const {
|
||||||
|
Luminaire::serialize(stream, manager);
|
||||||
|
stream->writeFloat(m_scale);
|
||||||
|
stream->writeFloat(m_sunDiskScale);
|
||||||
|
stream->writeFloat(m_sunTheta);
|
||||||
|
stream->writeFloat(m_turbidity);
|
||||||
|
stream->writeInt(m_resolution);
|
||||||
|
m_sunDir.serialize(stream);
|
||||||
|
}
|
||||||
|
|
||||||
|
void configure() {
|
||||||
|
m_sunDiskTheta = 0.0046333f;
|
||||||
|
Float sunDiskSA = 2*M_PI * (1-std::cos(m_sunDiskTheta));
|
||||||
|
m_sunDiskTheta *= m_sunDiskScale;
|
||||||
|
Float sunDiskSAScaled = 2*M_PI * (1-std::cos(m_sunDiskTheta));
|
||||||
|
|
||||||
|
m_intensity = computeSunRadiance(m_sunTheta, m_turbidity)
|
||||||
|
* m_scale * sunDiskSA/sunDiskSAScaled;
|
||||||
|
}
|
||||||
|
|
||||||
|
bool isCompound() const {
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
|
Luminaire *getElement(int i) {
|
||||||
|
if (i != 0)
|
||||||
|
return NULL;
|
||||||
|
int thetaBins = m_resolution, phiBins = m_resolution*2;
|
||||||
|
|
||||||
|
ref<Bitmap> bitmap = new Bitmap(phiBins, thetaBins, 128);
|
||||||
|
Point2 factor(M_PI / thetaBins, (2*M_PI) / phiBins);
|
||||||
|
float *target = bitmap->getFloatData();
|
||||||
|
for (int i=0; i<thetaBins; ++i) {
|
||||||
|
Float theta = (i+.5f)*factor.x;
|
||||||
|
for (int j=0; j<phiBins; ++j) {
|
||||||
|
Float phi = (j+.5f)*factor.y;
|
||||||
|
Spectrum s = Le(Ray(Point(0.0f), toSphere(theta, phi), 0))
|
||||||
|
* m_scale;
|
||||||
|
Float r, g, b;
|
||||||
|
s.toLinearRGB(r, g, b);
|
||||||
|
*target++ = r; *target++ = g;
|
||||||
|
*target++ = b; *target++ = 1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Instantiate a nested envmap plugin */
|
||||||
|
Properties props("envmap");
|
||||||
|
Properties::Data bitmapData;
|
||||||
|
bitmapData.ptr = (uint8_t *) bitmap.get();
|
||||||
|
bitmapData.size = sizeof(Bitmap);
|
||||||
|
props.setData("bitmap", bitmapData);
|
||||||
|
props.setTransform("toWorld", m_luminaireToWorld);
|
||||||
|
props.setFloat("samplingWeight", m_samplingWeight);
|
||||||
|
Luminaire *luminaire = static_cast<Luminaire *>(
|
||||||
|
PluginManager::getInstance()->createObject(
|
||||||
|
MTS_CLASS(Luminaire), props));
|
||||||
|
luminaire->configure();
|
||||||
|
return luminaire;
|
||||||
|
}
|
||||||
|
|
||||||
|
Spectrum Le(const Ray &ray) const {
|
||||||
|
Float theta = unitAngle(ray.d, m_sunDir);
|
||||||
|
|
||||||
|
if (theta < m_sunDiskTheta)
|
||||||
|
return m_intensity * smoothStep(m_sunDiskTheta, 0, theta);
|
||||||
|
else
|
||||||
|
return Spectrum(0.0f);
|
||||||
|
}
|
||||||
|
|
||||||
|
std::string toString() const {
|
||||||
|
std::ostringstream oss;
|
||||||
|
oss << "SunLuminaire[" << endl
|
||||||
|
<< " sunDir = " << m_sunDir.toString() << "," << endl
|
||||||
|
<< " sunDiskScale = " << m_sunDiskScale << "," << endl
|
||||||
|
<< " sunScale = " << m_scale << endl
|
||||||
|
<< "]";
|
||||||
|
return oss.str();
|
||||||
|
}
|
||||||
|
|
||||||
|
MTS_DECLARE_CLASS()
|
||||||
|
protected:
|
||||||
|
/* Environment map resolution */
|
||||||
|
int m_resolution;
|
||||||
|
/* Constant scale factor applied to the model */
|
||||||
|
Float m_scale;
|
||||||
|
/* Direction of the sun in luminaire-space */
|
||||||
|
Vector m_sunDir;
|
||||||
|
/* Angle cutoff for the sun disk */
|
||||||
|
Float m_sunDiskTheta;
|
||||||
|
/* Sun disk region scale factors */
|
||||||
|
Float m_sunDiskScale;
|
||||||
|
/* The turbidity of the sky ranges normally from 1 to 30.
|
||||||
|
For clear skies values in range [2,6] are useful. */
|
||||||
|
Float m_turbidity;
|
||||||
|
/* Intensity of the sun disk */
|
||||||
|
Spectrum m_intensity;
|
||||||
|
/* Elevation in radians */
|
||||||
|
Float m_sunTheta;
|
||||||
|
};
|
||||||
|
|
||||||
|
MTS_IMPLEMENT_CLASS_S(SunLuminaire, false, Luminaire)
|
||||||
|
MTS_EXPORT_PLUGIN(SunLuminaire, "Preetham sky luminaire");
|
||||||
|
MTS_NAMESPACE_END
|
||||||
|
|
||||||
Loading…
Reference in New Issue