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Fix: correct ICRS camera orientation

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wyj committed 2026-08-31 00:13:37 -04:00
1 parent e8deb1ff19
commit b2ac642de7
7 files changed
+47 -27
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src/catalog.c
+8 -6
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@@ -91,9 +91,11 @@ int catalog_load_csv(StarCatalog *catalog, const char *path)
const double lat = latitude * PI / 180.0;
const double cos_lat = cos(lat);
Star *star = &catalog->stars[catalog->count++];
/* Standard right-handed ICRS Cartesian axes: X is (RA, Dec) =
* (0, 0), Y is (90, 0), and Z is the north celestial pole. */
star->direction[0] = cos_lat * cos(lon);
star->direction[1] = sin(lat);
star->direction[2] = cos_lat * sin(lon);
star->direction[1] = cos_lat * sin(lon);
star->direction[2] = sin(lat);
star->temperature_K = temperature;
star->amplitude = amplitude;
}
@@ -170,10 +172,10 @@ int catalog_load_all_sky(StarCatalog *catalog, const char *directory)
static void lon_lat_from_direction(const double direction[3], double *longitude,
double *latitude)
{
*longitude = atan2(direction[2], direction[0]) * 180.0 / PI;
*longitude = atan2(direction[1], direction[0]) * 180.0 / PI;
if (*longitude < 0.0)
*longitude += 360.0;
*latitude = asin(fmax(-1.0, fmin(1.0, direction[1]))) * 180.0 / PI;
*latitude = asin(fmax(-1.0, fmin(1.0, direction[2]))) * 180.0 / PI;
}
static double dot(const double a[3], const double b[3])
@@ -195,8 +197,8 @@ static void direction_from_lon_lat(double longitude, double latitude,
const double lat = latitude * PI / 180.0;
const double cos_lat = cos(lat);
direction[0] = cos_lat * cos(lon);
direction[1] = sin(lat);
direction[2] = cos_lat * sin(lon);
direction[1] = cos_lat * sin(lon);
direction[2] = sin(lat);
}
/* The minimum of a plane dot-product over a longitude/latitude rectangle is