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/*
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@file LightingParameters.cpp
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@maintainer Morgan McGuire, matrix@graphics3d.com
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@created 2002-10-05
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@edited 2006-06-28
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*/
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#include "G3D/LightingParameters.h"
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#include "G3D/Matrix3.h"
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#include "G3D/spline.h"
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#include "G3D/GLight.h"
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#ifdef RBX_PLATFORM_ANDROID
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#include <G3D/android_time.h>
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#else
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#include <sys/timeb.h>
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#endif
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#include <sys/types.h>
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#ifndef _MSC_VER
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#define _timeb timeb
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#define _ftime ftime
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#endif
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#ifdef _MSC_VER
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# pragma warning(push)
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# pragma warning(disable : 4305)
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#endif
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namespace G3D {
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static const double sunRiseAndSetTime = HOUR / 2;
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static const double solarYear = 365.2564*DAY;
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static const double halfSolarYear = 182.6282;
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static const double moonPhaseInterval = DAY*29.53;
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// Tilt amount from the ecliptic
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static const double earthTilt = toRadians(23.5);
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static const double moonTilt = toRadians(5);
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// (very rough) Initial star offset on Jan 1 1970 midnight
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static const double initialStarRot = 1;
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// Initial moon phase on Jan 1 1970 midnight
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static const double initialMoonPhase = 0.75;
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LightingParameters::LightingParameters() {
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physicallyCorrect = true;
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setLatitude(BROWN_UNIVERSITY_LATITUDE);
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setTime(0);
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}
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LightingParameters::LightingParameters(
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const GameTime _time,
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bool _physicallyCorrect,
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float _latitude) {
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physicallyCorrect = _physicallyCorrect;
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setLatitude(_latitude);
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setTime(_time);
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}
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void LightingParameters::setLatitude(float _latitude) {
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geoLatitude = _latitude;
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}
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void LightingParameters::setTime(const GameTime _time) {
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// wrap to a 1 day interval
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double time = _time - floor(_time / DAY) * DAY;
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// Calculate starfield coordinate frame
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double starRot = initialStarRot - (2*G3D::pi()*(_time - (_time*floor(_time / SIDEREAL_DAY)))/SIDEREAL_DAY);
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float aX, aY, aZ;
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starVec.x = cos(starRot);
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starVec.y = 0;
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starVec.z = sin(starRot);
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starFrame.lookAt(starVec, Vector3::unitY());
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trueStarFrame.lookAt(starVec, Vector3::unitY());
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trueStarFrame.rotation.toEulerAnglesXYZ(aX, aY, aZ);
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aX -= geoLatitude;
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trueStarFrame.rotation = Matrix3::fromEulerAnglesXYZ(aX, aY, aZ);
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// sunAngle = 0 at midnight
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float sourceAngle = 2 * (float)G3D::pi() * time / DAY;
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// Calculate fake solar and lunar positions
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sunPosition.x = sin(sourceAngle);
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sunPosition.y = -cos(sourceAngle);
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sunPosition.z = 0;
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moonPosition.x = sin(sourceAngle + (float)G3D::pi());
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moonPosition.y = -cos(sourceAngle + (float)G3D::pi());
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moonPosition.z = 0;
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// Calculate "true" solar and lunar positions
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// These positions will always be somewhat wrong
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// unless _time is equal to real world GMT time,
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// and the current longitude is equal to zero. Also,
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// I'm assuming that the equinox-solstice interval
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// occurs exactly every 90 days, which isn't exactly
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// correct.
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// In addition, the precession of the moon's orbit is
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// not taken into account, but this should only account
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// for a 5 degree margin of error at most.
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float dayOfYearOffset = (_time - (_time*floor(_time / solarYear)))/DAY;
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moonPhase = floor(_time / moonPhaseInterval) + initialMoonPhase;
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float latRad = toRadians(geoLatitude);
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float sunOffset = -earthTilt*cos(G3D::pi()*(dayOfYearOffset-halfSolarYear)/halfSolarYear) - latRad;
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float moonOffset = ((-earthTilt+moonTilt)*sin(moonPhase*4)) - latRad;
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float curMoonPhase = (moonPhase*G3D::pi()*2);
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Matrix3 rotMat = Matrix3::fromAxisAngle(Vector3::unitZ().cross(sunPosition), sunOffset);
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trueSunPosition = rotMat * sunPosition;
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Vector3 trueMoon = Vector3(sin(curMoonPhase + sourceAngle),
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-cos(curMoonPhase + sourceAngle),
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0);
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rotMat = Matrix3::fromAxisAngleFast(Vector3::unitZ().cross(trueMoon), moonOffset);
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trueMoonPosition = rotMat * trueMoon;
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// Determine which light source we observe.
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if (!physicallyCorrect) {
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if ((sourceAngle < (G3D::pi() / 2)) || (sourceAngle > (3 * G3D::pi() / 2))) {
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source = MOON;
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sourceAngle += (float)G3D::pi();
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} else {
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source = SUN;
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}
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lightDirection.x = sin(sourceAngle);
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lightDirection.y = -cos(sourceAngle);
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lightDirection.z = 0;
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} else if (trueSunPosition.y > -.3f) {
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// The sun is always the stronger light source. When using
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// physically correct parameters, the sun and moon will
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// occasionally be in the visible sky at the same time.
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source = SUN;
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lightDirection = trueSunPosition;
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} else {
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source = MOON;
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lightDirection = trueMoonPosition;
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}
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const Color3 dayAmbient = Color3::white() * .40f;
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const Color3 dayDiffuse = Color3::white() * .75f;
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{
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static const double times[] = {MIDNIGHT, SUNRISE - HOUR, SUNRISE, SUNRISE + sunRiseAndSetTime / 4, SUNRISE + sunRiseAndSetTime, SUNSET - sunRiseAndSetTime, SUNSET - sunRiseAndSetTime / 2, SUNSET, SUNSET + HOUR/2, DAY};
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static const Color3 color[] = {Color3(.2f, .2f, .2f), Color3(.1f, .1, .1), Color3(0,0,0), Color3(.6, .6, 0), dayDiffuse, dayDiffuse, Color3(.1, .1, .075), Color3(.1, .05, .05), Color3(.1, .1, .1), Color3(.2, .2, .2)};
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lightColor = linearSpline(time, times, color, 10);
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}
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{
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static const double times[] = {MIDNIGHT, SUNRISE - HOUR, SUNRISE, SUNRISE + sunRiseAndSetTime / 4, SUNRISE + sunRiseAndSetTime, SUNSET - sunRiseAndSetTime, SUNSET - sunRiseAndSetTime / 2, SUNSET, SUNSET + HOUR/2, DAY};
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static const Color3 color[] = {Color3(0, .1, .3), Color3(0, .0, .1), Color3(0,0,0), Color3(0,0,0), dayAmbient, dayAmbient, Color3(.5, .2, .2), Color3(.05, .05, .1), Color3(0, .0, .1), Color3(0, .1, .3)};
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ambient = linearSpline(time, times, color, 10);
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}
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{
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static const double times[] = {MIDNIGHT, SUNRISE - HOUR, SUNRISE, SUNRISE + sunRiseAndSetTime / 2, SUNRISE + sunRiseAndSetTime, SUNSET - sunRiseAndSetTime, SUNSET - sunRiseAndSetTime / 2, SUNSET, SUNSET + HOUR/2, DAY };
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static const Color3 color[] = {Color3(.1, .1, .17), Color3(.05, .06, .07), Color3(.08, .08, .01), Color3(1,1,1) *.75, Color3(1,1,1) * .75, Color3(1,1,1) * .35, Color3(.5, .2, .2), Color3(.05, .05, .1), Color3(.06, .06, .07), Color3(.1, .1, .17)};
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diffuseAmbient = linearSpline(time, times, color, 10);
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}
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{
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static const double times[] = {MIDNIGHT, SUNRISE - 2*HOUR, SUNRISE - HOUR, SUNRISE - HOUR/2, SUNRISE, SUNRISE + sunRiseAndSetTime, SUNSET - sunRiseAndSetTime, SUNSET, SUNSET + HOUR/3, DAY};
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static const Color3 color[] = {Color3(0,0,0), Color3(0,0,0), Color3(.07,.07,.1), Color3(.2, .15, .01), Color3(.2, .15, .01), Color3(1,1,1), Color3(1,1,1), Color3(.4, .2, .05), Color3(0,0,0), Color3(0,0,0)};
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skyAmbient = linearSpline(time, times, color, sizeof(times)/sizeof(times[0]));
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}
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{
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static const double times[] = {MIDNIGHT, SUNRISE - 3 * HOUR, SUNRISE - 2*HOUR, SUNRISE - HOUR/2, SUNRISE, SUNRISE + sunRiseAndSetTime, SUNSET - sunRiseAndSetTime, SUNSET, SUNSET + HOUR/3, SUNSET + 2*HOUR, SUNSET + 3*HOUR, DAY};
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static const Color3 color[] = {Color3(0.0,0.0,0.0), 0.7f*Color3(0.0,0.0,0.0), 0.7f*Color3(0.3,0.3,0.4), Color3(0.4, 0.3, 0.3), Color3(0.3, 0.2, 0.3), Color3(1,1,1), Color3(1,1,1), Color3(.4, .3, .2), Color3(0.3,0.2,0.3), Color3(0.3,0.2,0.3), Color3(0,0,0), Color3(0,0,0) };
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skyAmbient2 = linearSpline(time, times, color, sizeof(times)/sizeof(times[0]));
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}
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emissiveScale = Color3::white();
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}
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GLight LightingParameters::directionalLight() const {
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return GLight::directional(lightDirection, lightColor);
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}
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}
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#ifdef _MSC_VER
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# pragma warning(pop)
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#endif
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