// This function runs the simulation and returns a newly created array of Stage objects
public Stage[] RunSimulation(LogMsg _log)
{
log = _log;
if (log != null)
{
log.AppendLine("RunSimulation started");
}
_timer.Reset();
_timer.Start();
// Start with the last stage to simulate
// (this is in a member variable so it can be accessed by AllowedToStage and ActivateStage)
currentStage = lastStage;
// Work out which engines would be active if just doing the staging and if this is different to the
// currently active engines then generate an extra stage
// Loop through all the engines
bool anyActive = false;
for (int i = 0; i < allEngines.Count; ++i)
{
EngineSim engine = allEngines[i];
if (log != null)
{
log.AppendLine("Testing engine mod of ", engine.partSim.name, ":", engine.partSim.partId);
}
bool bActive = engine.isActive;
bool bStage = (engine.partSim.inverseStage >= currentStage);
if (log != null)
{
log.AppendLine("bActive = ", bActive, " bStage = ", bStage);
}
if (HighLogic.LoadedSceneIsFlight)
{
if (bActive)
{
anyActive = true;
}
if (bActive != bStage)
{
// If the active state is different to the state due to staging
if (log != null)
{
log.AppendLine("Need to do current active engines first");
}
doingCurrent = true;
}
}
else
{
if (bStage)
{
if (log != null)
{
log.AppendLine("Marking as active");
}
engine.isActive = true;
}
}
}
// If we need to do current because of difference in engine activation and there actually are active engines
// then we do the extra stage otherwise activate the next stage and don't treat it as current
if (doingCurrent && anyActive)
{
currentStage++;
}
else
{
ActivateStage();
doingCurrent = false;
}
// Create a list of lists of PartSims that prevent decoupling
BuildDontStageLists(log);
if (log != null)
{
log.Flush();
}
// Create the array of stages that will be returned
Stage[] stages = new Stage[currentStage + 1];
int startStage = currentStage;
// Loop through the stages
while (currentStage >= 0)
{
if (log != null)
{
log.AppendLine("Simulating stage ", currentStage);
log.Flush();
_timer.Reset();
_timer.Start();
}
// Update active engines and resource drains
UpdateResourceDrains();
// Update the masses of the parts to correctly handle "no physics" parts
stageStartMass = UpdatePartMasses();
if (log != null)
{
allParts[0].DumpPartToLog(log, "", allParts);
}
// Create the Stage object for this stage
Stage stage = new Stage();
stageTime = 0d;
vecStageDeltaV = Vector3.zero;
stageStartCom = ShipCom;
stepStartMass = stageStartMass;
stepEndMass = 0;
CalculateThrustAndISP();
// Store various things in the Stage object
stage.thrust = totalStageThrust;
stage.thrustToWeight = totalStageThrust / (stageStartMass * gravity);
stage.maxThrustToWeight = stage.thrustToWeight;
stage.actualThrust = totalStageActualThrust;
stage.actualThrustToWeight = totalStageActualThrust / (stageStartMass * gravity);
CalculateRCS(gravity, false);
stage.RCSIsp = RCSIsp;
stage.RCSThrust = RCSThrust;
stage.RCSdeltaVStart = RCSDeltaV;
stage.RCSTWRStart = RCSTWR;
stage.RCSBurnTime = RCSBurnTime;
if (log != null)
{
log.AppendLine("stage.thrust = ", stage.thrust);
log.AppendLine("StageMass = ", stageStartMass);
log.AppendLine("Initial maxTWR = ", stage.maxThrustToWeight);
}
// calculate torque and associates
stage.maxThrustTorque = totalStageThrustForce.TorqueAt(stageStartCom).magnitude;
// torque divided by thrust. imagine that all engines are at the end of a lever that tries to turn the ship.
// this numerical value, in meters, would represent the length of that lever.
double torqueLeverArmLength = (stage.thrust <= 0) ? 0 : stage.maxThrustTorque / stage.thrust;
// how far away are the engines from the CoM, actually?
double thrustDistance = (stageStartCom - totalStageThrustForce.GetAverageForceApplicationPoint()).magnitude;
// the combination of the above two values gives an approximation of the offset angle.
double sinThrustOffsetAngle = 0;
if (thrustDistance > 1e-7)
{
sinThrustOffsetAngle = torqueLeverArmLength / thrustDistance;
if (sinThrustOffsetAngle > 1)
{
sinThrustOffsetAngle = 1;
}
}
stage.thrustOffsetAngle = Math.Asin(sinThrustOffsetAngle) * 180 / Math.PI;
// Calculate the total cost of the vessel at this point
stage.totalCost = 0d;
for (int i = 0; i < allParts.Count; ++i)
{
if (currentStage > allParts[i].decoupledInStage)
{
stage.totalCost += allParts[i].GetCost(currentStage);
}
}
// The total mass is simply the mass at the start of the stage
stage.totalMass = stageStartMass;
// If we have done a previous stage
if (currentStage < startStage)
{
// Calculate what the previous stage's mass and cost were by subtraction
Stage prev = stages[currentStage + 1];
prev.cost = prev.totalCost - stage.totalCost;
prev.mass = prev.totalMass - stage.totalMass;
}
// The above code will never run for the last stage so set those directly
if (currentStage == 0)
{
stage.cost = stage.totalCost;
stage.mass = stage.totalMass;
}
dontStageParts = dontStagePartsLists[currentStage];
if (log != null)
{
log.AppendLine("Stage setup took ", _timer.ElapsedMilliseconds, "ms");
if (dontStageParts.Count > 0)
{
log.AppendLine("Parts preventing staging:");
for (int i = 0; i < dontStageParts.Count; i++)
{
PartSim partSim = dontStageParts[i];
partSim.DumpPartToLog(log, "");
}
}
else
{
log.AppendLine("No parts preventing staging");
}
log.Flush();
}
// Now we will loop until we are allowed to stage
int loopCounter = 0;
while (!AllowedToStage())
{
loopCounter++;
//if (log != null) log.AppendLine("loop = ", loopCounter);
// Calculate how long each draining tank will take to drain and run for the minimum time
double resourceDrainTime = double.MaxValue;
PartSim partMinDrain = null;
foreach (PartSim partSim in drainingParts)
{
double time = partSim.TimeToDrainResource(log);
if (time < resourceDrainTime)
{
resourceDrainTime = time;
partMinDrain = partSim;
}
}
if (log != null)
{
log.Append("Drain time = ", resourceDrainTime, " (", partMinDrain.name)
.AppendLine(":", partMinDrain.partId, ")");
}
foreach (PartSim partSim in drainingParts)
{
partSim.DrainResources(resourceDrainTime, log);
}
// Get the mass after draining
stepEndMass = ShipMass;
stageTime += resourceDrainTime;
double stepEndTWR = totalStageThrust / (stepEndMass * gravity);
/*if (log != null)
* {
* log.AppendLine("After drain mass = ", stepEndMass);
* log.AppendLine("currentThrust = ", totalStageThrust);
* log.AppendLine("currentTWR = ", stepEndTWR);
* }*/
if (stepEndTWR > stage.maxThrustToWeight)
{
stage.maxThrustToWeight = stepEndTWR;
}
//if (log != null) log.AppendLine("newMaxTWR = ", stage.maxThrustToWeight);
// If we have drained anything and the masses make sense then add this step's deltaV to the stage total
if (resourceDrainTime > 0d && stepStartMass > stepEndMass && stepStartMass > 0d && stepEndMass > 0d)
{
vecStageDeltaV += vecThrust * (float)((currentisp * Units.GRAVITY * Math.Log(stepStartMass / stepEndMass)) / simpleTotalThrust);
}
// Update the active engines and resource drains for the next step
UpdateResourceDrains();
// Recalculate the current thrust and isp for the next step
CalculateThrustAndISP();
// Check if we actually changed anything
if (stepStartMass == stepEndMass)
{
//MonoBehaviour.print("No change in mass");
break;
}
// Check to stop rampant looping
if (loopCounter == 1000)
{
if (log != null)
{
log.AppendLine("exceeded loop count");
log.AppendLine("stageStartMass = " + stageStartMass);
log.AppendLine("stepStartMass = " + stepStartMass);
log.AppendLine("StepEndMass = " + stepEndMass);
}
break;
}
// The next step starts at the mass this one ended at
stepStartMass = stepEndMass;
}
// Store more values in the Stage object and stick it in the array
// Store the magnitude of the deltaV vector
stage.deltaV = vecStageDeltaV.magnitude;
stage.resourceMass = stageStartMass - stepEndMass;
if (HighLogic.LoadedSceneIsEditor) //this is only needed in the VAB.
{
CalculateRCS(gravity, true);
}
stage.RCSdeltaVEnd = RCSDeltaV;
stage.RCSTWREnd = RCSTWR;
// Recalculate effective stage isp from the stage deltaV (flip the standard deltaV calculation around)
// Note: If the mass doesn't change then this is a divide by zero
if (stageStartMass != stepStartMass)
{
stage.isp = stage.deltaV / (Units.GRAVITY * Math.Log(stageStartMass / stepStartMass));
}
else
{
stage.isp = 0;
}
// Zero stage time if more than a day (this should be moved into the window code)
stage.time = (stageTime < SECONDS_PER_DAY) ? stageTime : 0d;
stage.number = doingCurrent ? -1 : currentStage; // Set the stage number to -1 if doing current engines
stage.totalPartCount = allParts.Count;
stage.maxMach = maxMach;
stages[currentStage] = stage;
// Now activate the next stage
currentStage--;
doingCurrent = false;
if (log != null)
{
// Log how long the stage took
_timer.Stop();
log.AppendLine("Simulating stage took ", _timer.ElapsedMilliseconds, "ms");
stage.Dump(log);
_timer.Reset();
_timer.Start();
}
// Activate the next stage
ActivateStage();
if (log != null)
{
// Log how long it took to activate
_timer.Stop();
log.AppendLine("ActivateStage took ", _timer.ElapsedMilliseconds, "ms");
}
}
// Now we add up the various total fields in the stages
for (int i = 0; i < stages.Length; i++)
{
// For each stage we total up the cost, mass, deltaV and time for this stage and all the stages above
for (int j = i; j >= 0; j--)
{
stages[i].totalDeltaV += stages[j].deltaV;
stages[i].totalResourceMass += stages[j].resourceMass;
stages[i].totalTime += stages[j].time;
stages[i].partCount = i > 0 ? stages[i].totalPartCount - stages[i - 1].totalPartCount : stages[i].totalPartCount;
}
// We also total up the deltaV for stage and all stages below
for (int j = i; j < stages.Length; j++)
{
stages[i].inverseTotalDeltaV += stages[j].deltaV;
}
// Zero the total time if the value will be huge (24 hours?) to avoid the display going weird
// (this should be moved into the window code)
if (stages[i].totalTime > SECONDS_PER_DAY)
{
stages[i].totalTime = 0d;
}
}
FreePooledObject();
_timer.Stop();
if (log != null)
{
log.AppendLine("RunSimulation: ", _timer.ElapsedMilliseconds, "ms");
log.Flush();
}
log = null;
return(stages);
}
