public static environment_data analyze_environment(CelestialBody body, double altitude_mult)
{
// shortcuts
CelestialBody sun = Sim.Sun();
// calculate data
environment_data env = new environment_data();
env.body = body;
env.altitude = body.Radius * altitude_mult;
env.landed = env.altitude <= double.Epsilon;
env.breathable = env.landed && body.atmosphereContainsOxygen;
env.sun_dist = Sim.Apoapsis(Lib.PlanetarySystem(body)) - sun.Radius - body.Radius;
Vector3d sun_dir = (sun.position - body.position).normalized;
env.sun_flux = Sim.SolarFlux(env.sun_dist);
env.body_flux = Sim.BodyFlux(body, body.position + sun_dir * (body.Radius + env.altitude));
env.body_back_flux = Sim.BodyFlux(body, body.position - sun_dir * (body.Radius + env.altitude));
env.background_temp = Sim.BackgroundTemperature();
env.sun_temp = Sim.BlackBody(env.sun_flux);
env.body_temp = Sim.BlackBody(env.body_flux);
env.body_back_temp = Sim.BlackBody(env.body_back_flux);
env.light_temp = env.background_temp + env.sun_temp + env.body_temp;
env.shadow_temp = env.background_temp + env.body_back_temp;
env.atmo_temp = body.GetTemperature(0.0);
env.orbital_period = Sim.OrbitalPeriod(body, env.altitude);
env.shadow_period = Sim.ShadowPeriod(body, env.altitude);
env.shadow_time = env.shadow_period / env.orbital_period;
env.temp_diff = env.landed && body.atmosphere
? Math.Abs(Settings.SurvivalTemperature - env.atmo_temp)
: Lib.Mix(Math.Abs(Settings.SurvivalTemperature - env.light_temp), Math.Abs(Settings.SurvivalTemperature - env.shadow_temp), env.shadow_time);
env.atmo_factor = env.landed ? Sim.AtmosphereFactor(body, 0.7071) : 1.0;
// return data
return env;
}