private static void GetEngineMinMaxThrust(ModuleEngines engine, out double minThrust, out double maxThrust, bool log = false)
{
float isp = (engine.realIsp > 0) ? engine.realIsp : 280; // guess!
float pressure = (float)FlightGlobals.getStaticPressure() * 0.01f; // so 1.0 at Kerbin sea level?
float atmMaxThrust = engine.MaxThrustOutputAtm(true, true, pressure, FlightGlobals.getExternalTemperature());
minThrust = engine.GetEngineThrust(isp, 0); // can't get atmMinThrust (this ignore throttle limiting but thats ok)
maxThrust = atmMaxThrust; // this uses throttle limiting and should give vac thrust as pressure/temp specified too
if (log)
{
Debug.Log(" engine=" + engine + " isp=" + isp + " MinThrust=" + engine.GetEngineThrust(isp, 0) + " MaxThrust=" + atmMaxThrust + " operational=" + engine.isOperational);
}
}
// Compute engine thrust if one set of symmetrical engines is shutdown
// (primarily for a Falcon 9 landing to shutdown engines for slow touchdown)
public static List <ModuleEngines> ShutdownOuterEngines(Vessel vessel, float desiredThrust, bool log = false)
{
List <ModuleEngines> shutdown = new List <ModuleEngines>();
Debug.Log("ShutdownOuterEngines desiredThrust=" + desiredThrust + " mass=" + vessel.totalMass);
// Find engine parts and sort by closest to centre first
List <KeyValuePair <double, ModuleEngines> > allEngines = new List <KeyValuePair <double, ModuleEngines> >();
foreach (Part part in vessel.GetActiveParts())
{
Vector3 relpos = vessel.transform.InverseTransformPoint(part.transform.position);
part.isEngine(out List <ModuleEngines> engines);
double dist = Math.Sqrt(relpos.x * relpos.x + relpos.z * relpos.z);
foreach (ModuleEngines engine in engines)
{
allEngines.Add(new KeyValuePair <double, ModuleEngines>(dist, engine));
}
}
allEngines.Sort(Closest);
// Loop through engines starting a closest to axis
// Accumulate minThrust, once minThrust exceeds desiredThrust shutdown this and all
// further out engines
float minThrust = 0, maxThrust = 0;
double shutdownDist = float.MaxValue;
foreach (var engDist in allEngines)
{
ModuleEngines engine = engDist.Value;
if (engine.isOperational)
{
minThrust += engine.GetEngineThrust(engine.realIsp, 0);
maxThrust += engine.GetEngineThrust(engine.realIsp, 1);
if (shutdownDist == float.MaxValue)
{
if ((minThrust < desiredThrust) && (desiredThrust < maxThrust)) // good amount of thrust
{
shutdownDist = engDist.Key + 0.1f;
}
if (minThrust > desiredThrust)
{
shutdownDist = engDist.Key - 0.1f;
}
}
if (engDist.Key > shutdownDist)
{
if (log)
{
Debug.Log("[BoosterGuidance] ComputeShutdownMinMaxThrust(): minThrust=" + minThrust + " desiredThrust=" + desiredThrust + " SHUTDOWN");
}
engine.Shutdown();
shutdown.Add(engine);
}
else
if (log)
{
Debug.Log("[BoosterGuidance] ComputeShutdownMinMaxThrust(): minThrust=" + minThrust + " desiredThrust=" + desiredThrust + " KEEP");
}
}
}
Debug.Log(shutdown.Count + " engines shutdown");
return(shutdown);
}