update trajectory equation function inputs

src/main.cpp

@@ -84,7 +84,7 @@ updateSatellitePosition(entity& satellite)
 
 	// TODO: decouple framerate from time_step
 	g_orbit.nu = getPropagatedTrueAnomaly(g_orbit, g_orbit.nu, g_time_step);
-	double r2 = getRadialPosition(g_orbit.ep, g_orbit.nu);
+	double r2 = getRadialDistance(g_orbit.ep.e, g_orbit.ep.p, g_orbit.nu);
 	glm::vec2 coords = polarToRect(g_orbit.nu, r2);
 	glm::vec3 v = g_orbit.pos = glm::vec3(coords, 0);
 	entSetWorldPosition(satellite, xform * glm::vec4(v.x, v.y, v.z, 1));

src/orbits.cpp

@@ -185,9 +185,9 @@ getPropagatedTrueAnomaly(orbital_elements orbit,
 }
 
 double
-getRadialPosition(ellipse_parameters ep, double true_anom)
+getRadialDistance(double e, double p, double true_anom)
 {
-	return ep.p / (1 + ep.e * cos(true_anom));
+	return p / (1 + e * cos(true_anom));
 }
 
 glm::vec2

src/orbits.h

@@ -109,9 +109,8 @@ getPropagatedTrueAnomaly(orbital_elements orbit,
 	unsigned int time_step);
 
 // NOTE: aka) the trajectory equation (eq. 2.45)
-// NOTE: returns radial distance in kilometers
 double
-getRadialPosition(ellipse_parameters ep, double true_anom);
+getRadialDistance(double e, double p, double true_anom);
 
 glm::vec2
 polarToRect(double true_anom, double r);