mirror of
https://github.com/MaSzyna-EU07/maszyna.git
synced 2026-03-22 15:05:03 +01:00
moon object, tweaks to the lighting model
This commit is contained in:
tmj-fstate
161
sun.cpp
161
sun.cpp
@@ -48,8 +48,6 @@ cSun::render() {
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GLfloat LightPosition[]= { 10.0f, 50.0f, -5.0f, 1.0f }; // ambient
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glLightfv(GL_LIGHT1, GL_POSITION, LightPosition );
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*/
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glDisable(GL_LIGHTING);
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glDisable(GL_FOG);
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glColor4f( 255.0f/255.0f, 242.0f/255.0f, 231.0f/255.0f, 1.f );
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// debug line to locate the sun easier
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Math3D::vector3 position = m_position;
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@@ -62,8 +60,6 @@ cSun::render() {
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// radius is a result of scaling true distance down to 2km -- it's scaled by equal ratio
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gluSphere( sunsphere, (float)(m_body.distance * 9.359157), 12, 12 );
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glPopMatrix();
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glEnable(GL_FOG);
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glEnable(GL_LIGHTING);
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}
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Math3D::vector3
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@@ -115,106 +111,117 @@ void cSun::setPressure( float const Pressure ) {
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void cSun::move() {
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static double degrad = 57.295779513; // converts from radians to degrees
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static double raddeg = 0.0174532925; // converts from degrees to radians
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static double radtodeg = 57.295779513; // converts from radians to degrees
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static double degtorad = 0.0174532925; // converts from degrees to radians
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SYSTEMTIME localtime; // time for the calculation
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time( &localtime );
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if( m_observer.hour >= 0 ) { localtime.wHour = m_observer.hour; }
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if( m_observer.hour >= 0 ) { localtime.wHour = m_observer.hour; }
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if( m_observer.minute >= 0 ) { localtime.wMinute = m_observer.minute; }
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if( m_observer.second >= 0 ) { localtime.wSecond = m_observer.second; }
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double ut = localtime.wHour
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+ localtime.wMinute / 60.0 // too low resolution, noticeable skips
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+ localtime.wSecond / 3600.0; // good enough in normal circumstances
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/*
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+ localtime.wMilliseconds / 3600000.0; // for really smooth movement
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*/
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double daynumber = 367 * localtime.wYear
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- 7 * ( localtime.wYear + ( localtime.wMonth + 9 ) /12 ) / 4
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+ 275 * localtime.wMonth / 9
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+ localtime.wDay
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- 730530
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+ (ut / 24.0);
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+ localtime.wMinute / 60.0 // too low resolution, noticeable skips
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+ localtime.wSecond / 3600.0; // good enough in normal circumstances
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/*
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+ localtime.wMilliseconds / 3600000.0; // for really smooth movement
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*/
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double daynumber = 367 * localtime.wYear
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- 7 * ( localtime.wYear + ( localtime.wMonth + 9 ) / 12 ) / 4
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+ 275 * localtime.wMonth / 9
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+ localtime.wDay
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- 730530
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+ ( ut / 24.0 );
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// Universal Coordinated (Greenwich standard) time
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// Universal Coordinated (Greenwich standard) time
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m_observer.utime = ut * 3600.0;
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m_observer.utime = m_observer.utime / 3600.0 - m_observer.timezone;
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// mean longitude
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m_body.mnlong = 280.460 + 0.9856474 * daynumber;
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m_body.mnlong -= 360.0 * (int) ( m_body.mnlong / 360.0 ); // clamp the range to 0-360
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if( m_body.mnlong < 0.0 ) m_body.mnlong += 360.0;
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// mean anomaly
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m_body.mnanom = 357.528 + 0.9856003 * daynumber;
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m_body.mnanom -= 360.0 * (int) ( m_body.mnanom / 360.0 ); // clamp the range to 0-360
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if( m_body.mnanom < 0.0 ) m_body.mnanom += 360.0;
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// ecliptic longitude
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m_body.eclong = m_body.mnlong
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+ 1.915 * sin( m_body.mnanom * raddeg )
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+ 0.020 * sin ( 2.0 * m_body.mnanom * raddeg );
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m_body.eclong -= 360.0 * (int)( m_body.eclong / 360.0 );
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if( m_body.eclong < 0.0 ) m_body.eclong += 360.0; // clamp the range to 0-360
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// perihelion longitude
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m_body.phlong = 282.9404 + 4.70935e-5 * daynumber; // w
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// orbit eccentricity
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double const e = 0.016709 - 1.151e-9 * daynumber;
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// mean anomaly
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m_body.mnanom = 356.0470 + 0.9856002585 * daynumber; // M
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m_body.mnanom -= 360.0 * (int)( m_body.mnanom / 360.0 ); // clamp the range to 0-360
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if( m_body.mnanom < 0.0 ) m_body.mnanom += 360.0;
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// obliquity of the ecliptic
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m_body.ecobli = 23.439 - 4.0e-07 * daynumber;
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m_body.oblecl = 23.4393 - 3.563e-7 * daynumber;
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// mean longitude
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m_body.mnlong = m_body.phlong + m_body.mnanom; // L = w + M
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m_body.mnlong -= 360.0 * (int)( m_body.mnlong / 360.0 ); // clamp the range to 0-360
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if( m_body.mnlong < 0.0 ) m_body.mnlong += 360.0;
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// eccentric anomaly
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double const E = m_body.mnanom + radtodeg * e * std::sin( degtorad * m_body.mnanom ) * ( 1.0 + e * std::cos( degtorad * m_body.mnanom ) );
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// ecliptic plane rectangular coordinates
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double const xv = std::cos( degtorad * E ) - e;
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double const yv = std::sin( degtorad * E ) * std::sqrt( 1.0 - e*e );
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// distance
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m_body.distance = std::sqrt( xv*xv + yv*yv ); // r
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// true anomaly
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m_body.tranom = radtodeg * std::atan2( yv, xv ); // v
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// ecliptic longitude
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m_body.eclong = m_body.tranom + m_body.phlong; // lon = v + w
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m_body.eclong -= 360.0 * (int)( m_body.eclong / 360.0 );
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if( m_body.eclong < 0.0 ) m_body.eclong += 360.0; // clamp the range to 0-360
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/*
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// ecliptic rectangular coordinates
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double const x = m_body.distance * std::cos( degtorad * m_body.eclong );
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double const y = m_body.distance * std::sin( degtorad * m_body.eclong );
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double const z = 0.0;
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// equatorial rectangular coordinates
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double const xequat = x;
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double const yequat = y * std::cos( degtorad * m_body.oblecl ) - 0.0 * std::sin( degtorad * m_body.oblecl );
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double const zequat = y * std::sin( degtorad * m_body.oblecl ) + 0.0 * std::cos( degtorad * m_body.oblecl );
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// declination
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m_body.declin = radtodeg * std::atan2( zequat, std::sqrt( xequat*xequat + yequat*yequat ) );
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// right ascension
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m_body.rascen = radtodeg * std::atan2( yequat, xequat );
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*/
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// declination
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m_body.declin = radtodeg * std::asin( std::sin( m_body.oblecl * degtorad ) * std::sin( m_body.eclong * degtorad ) );
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// declination
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m_body.declin = degrad * asin( sin (m_body.ecobli * raddeg) * sin (m_body.eclong * raddeg) );
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// right ascension
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double top = std::cos( degtorad * m_body.oblecl ) * std::sin( degtorad * m_body.eclong );
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double bottom = std::cos( degtorad * m_body.eclong );
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// right ascension
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double top = cos ( raddeg * m_body.ecobli ) * sin ( raddeg * m_body.eclong );
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double bottom = cos ( raddeg * m_body.eclong );
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m_body.rascen = radtodeg * std::atan2( top, bottom );
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if( m_body.rascen < 0.0 ) m_body.rascen += 360.0; // (make it a positive angle)
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m_body.rascen = degrad * atan2( top, bottom );
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if( m_body.rascen < 0.0 ) m_body.rascen += 360.0; // (make it a positive angle)
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// Greenwich mean sidereal time
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m_observer.gmst = 6.697375 + 0.0657098242 * daynumber + m_observer.utime;
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// Greenwich mean sidereal time
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m_observer.gmst = 6.697375 + 0.0657098242 * daynumber + m_observer.utime;
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m_observer.gmst -= 24.0 * (int)( m_observer.gmst / 24.0 );
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if( m_observer.gmst < 0.0 ) m_observer.gmst += 24.0;
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m_observer.gmst -= 24.0 * (int)( m_observer.gmst / 24.0 );
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if( m_observer.gmst < 0.0 ) m_observer.gmst += 24.0;
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// local mean sidereal time
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m_observer.lmst = m_observer.gmst * 15.0 + m_observer.longitude;
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// local mean sidereal time
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m_observer.lmst = m_observer.gmst * 15.0 + m_observer.longitude;
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m_observer.lmst -= 360.0 * (int)( m_observer.lmst / 360.0 );
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if( m_observer.lmst < 0.0 ) m_observer.lmst += 360.0;
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m_observer.lmst -= 360.0 * (int)( m_observer.lmst / 360.0 );
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if( m_observer.lmst < 0.0 ) m_observer.lmst += 360.0;
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// hour angle
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m_body.hrang = m_observer.lmst - m_body.rascen;
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// hour angle
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m_body.hrang = m_observer.lmst - m_body.rascen;
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if( m_body.hrang < -180.0 ) m_body.hrang += 360.0; // (force it between -180 and 180 degrees)
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if( m_body.hrang < -180.0 ) m_body.hrang += 360.0; // (force it between -180 and 180 degrees)
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else if( m_body.hrang > 180.0 ) m_body.hrang -= 360.0;
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double cz; // cosine of the solar zenith angle
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double cz; // cosine of the solar zenith angle
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double tdatcd = cos( raddeg * m_body.declin );
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double tdatch = cos( raddeg * m_body.hrang );
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double tdatcl = cos( raddeg * m_observer.latitude );
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double tdatsd = sin( raddeg * m_body.declin );
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double tdatsl = sin( raddeg * m_observer.latitude );
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double tdatcd = std::cos( degtorad * m_body.declin );
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double tdatch = std::cos( degtorad * m_body.hrang );
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double tdatcl = std::cos( degtorad * m_observer.latitude );
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double tdatsd = std::sin( degtorad * m_body.declin );
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double tdatsl = std::sin( degtorad * m_observer.latitude );
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cz = tdatsd * tdatsl + tdatcd * tdatcl * tdatch;
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cz = tdatsd * tdatsl + tdatcd * tdatcl * tdatch;
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// (watch out for the roundoff errors)
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if( fabs (cz) > 1.0 ) { cz >= 0.0 ? cz = 1.0 : cz = -1.0; }
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if( fabs( cz ) > 1.0 ) { cz >= 0.0 ? cz = 1.0 : cz = -1.0; }
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m_body.zenetr = acos( cz ) * degrad;
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m_body.elevetr = 90.0 - m_body.zenetr;
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refract();
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// additional calculations for proper object sizing.
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// orbit eccentricity
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double e = 0.016709 - 1.151e-9 * daynumber;
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// eccentric anomaly
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double E = m_body.mnanom + e * degrad * sin(m_body.mnanom) * ( 1.0 + e * cos(m_body.mnanom) );
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double xv = cos(E) - e;
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double yv = sqrt(1.0 - e*e) * sin(E);
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m_body.distance = sqrt( xv*xv + yv*yv );
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m_body.zenetr = std::acos( cz ) * radtodeg;
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m_body.elevetr = 90.0 - m_body.zenetr;
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refract();
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}
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void cSun::refract() {
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