#include "orbits.h"
#include "moon.h"
+#include "../Aircraft/aircraft.h"
#include "../Include/general.h"
#include "../Main/views.h"
#include "../Time/fg_time.h"
struct OrbElements sunParams,
struct fgTIME t)
{
- struct CelestialCoord
- result;
-
- double
- eccAnom, ecl, lonecl, latecl, actTime,
- xv, yv, v, r, xh, yh, zh, xg, yg, zg, xe, ye, ze,
- Ls, Lm, D, F;
-
- /* calculate the angle between ecliptic and equatorial coordinate system */
- actTime = fgCalcActTime(t);
- ecl = fgDegToRad(23.4393 - 3.563E-7 * actTime); // in radians of course
-
- /* calculate the eccentric anomaly */
- eccAnom = fgCalcEccAnom(params.M, params.e);
-
- /* calculate the moon's distance (d) and true anomaly (v) */
- xv = params.a * ( cos(eccAnom) - params.e);
- yv = params.a * ( sqrt(1.0 - params.e*params.e) * sin(eccAnom));
- v =atan2(yv, xv);
- r = sqrt(xv*xv + yv*yv);
-
- /* estimate the geocentric rectangular coordinates here */
- xh = r * (cos(params.N) * cos(v + params.w) - sin(params.N) * sin(v + params.w) * cos(params.i));
- yh = r * (sin(params.N) * cos(v + params.w) + cos(params.N) * sin(v + params.w) * cos(params.i));
- zh = r * (sin(v + params.w) * sin(params.i));
-
- /* calculate the ecliptic latitude and longitude here */
- lonecl = atan2( yh, xh);
- latecl = atan2( zh, sqrt( xh*xh + yh*yh));
-
- /* calculate a number of perturbations */
- Ls = sunParams.M + sunParams.w;
- Lm = params.M + params.w + params.N;
- D = Lm - Ls;
- F = Lm - params.N;
-
- lonecl += fgDegToRad(
- - 1.274 * sin (params.M - 2*D) // the Evection
- + 0.658 * sin (2 * D) // the Variation
- - 0.186 * sin (sunParams.M) // the yearly variation
- - 0.059 * sin (2*params.M - 2*D)
- - 0.057 * sin (params.M - 2*D + sunParams.M)
- + 0.053 * sin (params.M + 2*D)
- + 0.046 * sin (2*D - sunParams.M)
- + 0.041 * sin (params.M - sunParams.M)
- - 0.035 * sin (D) // the Parallactic Equation
- - 0.031 * sin (params.M + sunParams.M)
- - 0.015 * sin (2*F - 2*D)
- + 0.011 * sin (params.M - 4*D)
- ); /* Pheeuuwwww */
- latecl += fgDegToRad(
- - 0.173 * sin (F - 2*D)
- - 0.055 * sin (params.M - F - 2*D)
- - 0.046 * sin (params.M + F - 2*D)
- + 0.033 * sin (F + 2*D)
- + 0.017 * sin (2 * params.M + F)
- ); /* Yep */
-
- r += (
- - 0.58 * cos(params.M - 2*D)
- - 0.46 * cos(2*D)
- ); /* Ok! */
-
- xg = r * cos(lonecl) * cos(latecl);
- yg = r * sin(lonecl) * cos(latecl);
- zg = r * sin(latecl);
-
- xe = xg;
- ye = yg * cos(ecl) - zg * sin(ecl);
- ze = yg * sin(ecl) + zg * cos(ecl);
-
- result.RightAscension = atan2(ye, xe);
- result.Declination = atan2(ze, sqrt(xe*xe + ye*ye));
- return result;
+ struct CelestialCoord
+ geocCoord, topocCoord;
+
+
+ double
+ eccAnom, ecl, lonecl, latecl, actTime,
+ xv, yv, v, r, xh, yh, zh, xg, yg, zg, xe, ye, ze,
+ Ls, Lm, D, F, mpar, gclat, rho, HA, g;
+
+ struct fgAIRCRAFT *a;
+ struct fgFLIGHT *f;
+
+ a = ¤t_aircraft;
+ f = &a->flight;
+
+/* calculate the angle between ecliptic and equatorial coordinate system */
+ actTime = fgCalcActTime(t);
+ ecl = fgDegToRad(23.4393 - 3.563E-7 * actTime); // in radians of course
+
+ /* calculate the eccentric anomaly */
+ eccAnom = fgCalcEccAnom(params.M, params.e);
+
+ /* calculate the moon's distance (d) and true anomaly (v) */
+ xv = params.a * ( cos(eccAnom) - params.e);
+ yv = params.a * ( sqrt(1.0 - params.e*params.e) * sin(eccAnom));
+ v =atan2(yv, xv);
+ r = sqrt(xv*xv + yv*yv);
+
+ /* estimate the geocentric rectangular coordinates here */
+ xh = r * (cos(params.N) * cos(v + params.w) - sin(params.N) * sin(v + params.w) * cos(params.i));
+ yh = r * (sin(params.N) * cos(v + params.w) + cos(params.N) * sin(v + params.w) * cos(params.i));
+ zh = r * (sin(v + params.w) * sin(params.i));
+
+ /* calculate the ecliptic latitude and longitude here */
+ lonecl = atan2( yh, xh);
+ latecl = atan2( zh, sqrt( xh*xh + yh*yh));
+
+ /* calculate a number of perturbations */
+ Ls = sunParams.M + sunParams.w;
+ Lm = params.M + params.w + params.N;
+ D = Lm - Ls;
+ F = Lm - params.N;
+
+ lonecl += fgDegToRad(
+ - 1.274 * sin (params.M - 2*D) // the Evection
+ + 0.658 * sin (2 * D) // the Variation
+ - 0.186 * sin (sunParams.M) // the yearly variation
+ - 0.059 * sin (2*params.M - 2*D)
+ - 0.057 * sin (params.M - 2*D + sunParams.M)
+ + 0.053 * sin (params.M + 2*D)
+ + 0.046 * sin (2*D - sunParams.M)
+ + 0.041 * sin (params.M - sunParams.M)
+ - 0.035 * sin (D) // the Parallactic Equation
+ - 0.031 * sin (params.M + sunParams.M)
+ - 0.015 * sin (2*F - 2*D)
+ + 0.011 * sin (params.M - 4*D)
+ ); /* Pheeuuwwww */
+ latecl += fgDegToRad(
+ - 0.173 * sin (F - 2*D)
+ - 0.055 * sin (params.M - F - 2*D)
+ - 0.046 * sin (params.M + F - 2*D)
+ + 0.033 * sin (F + 2*D)
+ + 0.017 * sin (2 * params.M + F)
+ ); /* Yep */
+
+ r += (
+ - 0.58 * cos(params.M - 2*D)
+ - 0.46 * cos(2*D)
+ ); /* Ok! */
+
+ xg = r * cos(lonecl) * cos(latecl);
+ yg = r * sin(lonecl) * cos(latecl);
+ zg = r * sin(latecl);
+
+ xe = xg;
+ ye = yg * cos(ecl) - zg * sin(ecl);
+ ze = yg * sin(ecl) + zg * cos(ecl);
+
+
+
+
+ geocCoord.RightAscension = atan2(ye, xe);
+ geocCoord.Declination = atan2(ze, sqrt(xe*xe + ye*ye));
+
+ /* New since 25 december 1997 */
+ /* Calculate the moon's topocentric position instead of it's geocentric! */
+
+ mpar = asin( 1 / r); /* calculate the moon's parrallax, i.e. the apparent size of the
+ (equatorial) radius of the Earth, as seen from the moon */
+ gclat = FG_Latitude - 0.083358 * sin (2 * fgDegToRad( FG_Latitude));
+ rho = 0.99883 + 0.00167 * cos(2 * fgDegToRad(FG_Latitude));
+
+ if (geocCoord.RightAscension < 0)
+ geocCoord.RightAscension += (2*M_PI);
+
+ HA = t.lst - (3.8197186 * geocCoord.RightAscension);
+
+ g = atan (tan(gclat) / cos( (HA / 3.8197186)));
+
+
+
+ topocCoord.RightAscension = geocCoord.RightAscension - mpar * rho * cos(gclat) * sin(HA) / cos(geocCoord.Declination);
+ topocCoord.Declination = geocCoord.Declination - mpar * rho * sin(gclat) * sin(g - geocCoord.Declination) / sin(g);
+ return topocCoord;
}
struct SunPos {
double xs;
double ys;
+ double dist;
};
struct OrbElements {
double RightAscension;
double Declination;
double distance;
+ double magnitude;
};
/* $Log$
-/* Revision 1.1 1997/10/25 03:16:10 curt
-/* Initial revision of code contributed by Durk Talsma.
+/* Revision 1.2 1997/12/30 16:36:52 curt
+/* Merged in Durk's changes ...
/*
+ * Revision 1.1 1997/10/25 03:16:10 curt
+ * Initial revision of code contributed by Durk Talsma.
+ *
*/
struct CelestialCoord fgCalculatePlanet(struct OrbElements planet,
struct OrbElements theSun,
- struct fgTIME t)
+ struct fgTIME t, int idx)
{
struct CelestialCoord
result;
SolarPosition;
double
- eccAnom, r, v, ecl, actTime,
+ eccAnom, r, v, ecl, actTime, R, s, ir, Nr, B, FV, ring_magn,
xv, yv, xh, yh, zh, xg, yg, zg, xe, ye, ze;
actTime = fgCalcActTime(t);
xe = xg;
ye = yg * cos(ecl) - zg * sin(ecl);
- ze = yg * sin(ecl) + zg * cos(ecl);
+ ze = yg * sin(ecl) + zg * cos(ecl);
+
result.RightAscension = atan2(ye,xe);
result.Declination = atan2(ze, sqrt(xe*xe + ye*ye));
+
+
+ /* Let's calculate the brightness of the planet */
+ R = sqrt ( xg*xg + yg*yg + zg*zg);
+ s = SolarPosition.dist;
+ FV = acos( (r*r + R*R - s*s) / (2*r*R));
+ FV *= 57.29578; /* convert radians to degrees */
+ switch(idx)
+ {
+ case 2: /* mercury */
+ result.magnitude = -0.36 + 5*log10( r*R ) + 0.027 * FV + 2.2E-13 * pow(FV, 6);
+ break;
+ case 3: /*venus */
+ result.magnitude = -4.34 + 5*log10( r*R ) + 0.013 * FV + 4.2E-07 * pow(FV,3);
+ break;
+ case 4: /* mars */
+ result.magnitude = -1.51 + 5*log10( r*R ) + 0.016 * FV;
+ break;
+ case 5: /* Jupiter */
+ result.magnitude = -9.25 + 5*log10( r*R ) + 0.014 * FV;
+ break;
+ case 6: /* Saturn */
+
+ ir = 0.4897394;
+ Nr = 2.9585076 + 6.6672E-7*actTime;
+
+ B = asin ( sin (result.Declination) * cos(ir) - cos(result.Declination) * sin (ir) * sin (result.RightAscension - Nr));
+ ring_magn = -2.6 * sin (abs(B)) + 1.2 * pow(sin(B),2);
+ result.magnitude = -9.0 + 5*log10( r*R ) + 0.044 * FV + ring_magn;
+ break;
+ case 7: /* Uranus */
+ result.magnitude = -7.15 + 5*log10( r*R) + 0.001 * FV;
+ break;
+ case 8: /* Neptune */
+ result.magnitude = -6.90 + 5*log10 (r*R) + 0.001 *FV;
+ break;
+ default:
+ printf("index %d out of range !!!!\n", idx);
+ }
+ printf("Geocentric dist %f\n"
+ "Heliocentric dist %f\n"
+ "Distance to the sun %f\n"
+ "Phase angle %f\n"
+ "Brightness %f\n", R, r, s, FV, result.magnitude);
return result;
}
+
/* $Log$
-/* Revision 1.2 1997/12/12 21:41:29 curt
-/* More light/material property tweaking ... still a ways off.
+/* Revision 1.3 1997/12/30 16:36:52 curt
+/* Merged in Durk's changes ...
/*
+ * Revision 1.2 1997/12/12 21:41:29 curt
+ * More light/material property tweaking ... still a ways off.
+ *
* Revision 1.1 1997/10/25 03:16:10 curt
* Initial revision of code contributed by Durk Talsma.
*
*/
+
+
struct CelestialCoord fgCalculatePlanet(struct OrbElements planet,
struct OrbElements theSun,
- struct fgTIME t);
+ struct fgTIME t, int idx);
#endif /* PLANETS_H */
/* $Log$
-/* Revision 1.2 1997/12/12 21:41:30 curt
-/* More light/material property tweaking ... still a ways off.
+/* Revision 1.3 1997/12/30 16:36:53 curt
+/* Merged in Durk's changes ...
/*
+ * Revision 1.2 1997/12/12 21:41:30 curt
+ * More light/material property tweaking ... still a ways off.
+ *
* Revision 1.1 1997/10/25 03:16:11 curt
* Initial revision of code contributed by Durk Talsma.
*
coordinates (xs, ys) */
solarPosition.xs = r * cos(lonSun);
solarPosition.ys = r * sin(lonSun);
+ solarPosition.dist = r;
return solarPosition;
}
void fgSunRender() {
struct fgVIEW *v;
struct fgTIME *t;
- GLfloat color[4] = { 0.85, 0.65, 0.05, 1.0 };
- /* double x_2, x_4, x_8, x_10; */
- /* GLfloat ambient; */
- /* GLfloat amb[3], diff[3]; */
+ struct fgLIGHT *l;
+ /* GLfloat color[4] = { 0.85, 0.65, 0.05, 1.0 }; */
+ GLfloat color[4] = { 1.00, 1.00, 1.00, 1.00 };
+ double x_2, x_4, x_8, x_10;
+ GLfloat ambient;
+ GLfloat amb[3], diff[3];
t = &cur_time_params;
v = ¤t_view;
+ l = &cur_light_params;
- /* x_2 = t->sun_angle * t->sun_angle;
+ x_2 = l->sun_angle * l->sun_angle;
x_4 = x_2 * x_2;
x_8 = x_4 * x_4;
- x_10 = x_8 * x_2; */
+ x_10 = x_8 * x_2;
- /* ambient = (0.4 * pow(1.1, -x_10 / 30.0));
+ ambient = (0.4 * pow(1.1, -x_10 / 30.0));
if ( ambient < 0.3 ) ambient = 0.3;
if ( ambient > 1.0 ) ambient = 1.0;
+
amb[0] = 0.50 + ((ambient * 6.66) - 1.6);
amb[1] = 0.00 + ((ambient * 6.66) - 1.6);
amb[2] = 0.00 + ((ambient * 6.66) - 1.6);
diff[0] = 0.0;
diff[1] = 0.0;
diff[2] = 0.0;
- diff[3] = 0.0; */
+ diff[3] = 1.0;
/* set lighting parameters */
- /* xglLightfv(GL_LIGHT0, GL_AMBIENT, color );
+ xglLightfv(GL_LIGHT0, GL_AMBIENT, color );
xglLightfv(GL_LIGHT0, GL_DIFFUSE, color );
xglMaterialfv(GL_FRONT, GL_AMBIENT, amb);
- xglMaterialfv(GL_FRONT, GL_DIFFUSE, diff); */
+ xglMaterialfv(GL_FRONT, GL_DIFFUSE, diff);
+ xglMaterialfv(GL_FRONT, GL_SHININESS, diff);
+ xglMaterialfv(GL_FRONT, GL_EMISSION, diff);
+ xglMaterialfv(GL_FRONT, GL_SPECULAR, diff);
- xglDisable( GL_LIGHTING );
+ /* xglDisable( GL_LIGHTING ); */
xglPushMatrix();
xglTranslatef(xSun, ySun, zSun);
xglScalef(1400, 1400, 1400);
- xglColor4f(0.85, 0.65, 0.05, 1.0);
+ xglColor3f(0.85, 0.65, 0.05);
xglCallList(sun_obj);
xglPopMatrix();
- xglEnable( GL_LIGHTING );
+ /* xglEnable( GL_LIGHTING ); */
}
/* $Log$
-/* Revision 1.8 1997/12/19 23:35:00 curt
-/* Lot's of tweaking with sky rendering and lighting.
+/* Revision 1.9 1997/12/30 16:36:54 curt
+/* Merged in Durk's changes ...
/*
+ * Revision 1.8 1997/12/19 23:35:00 curt
+ * Lot's of tweaking with sky rendering and lighting.
+ *
* Revision 1.7 1997/12/17 23:12:16 curt
* Fixed so moon and sun display lists aren't recreate periodically.
*
projects / simgear.git / commitdiff