public static double GetChuteArea(List <Part> parts)
{
double RCParameter = 0;
bool realChuteInUse = false;
try
{
foreach (Part p in parts)
{
//Make a list of all the Module Names for easy checking later. This can be avoided, but is convenient.
List <string> ModuleNames = new List <string>();
foreach (PartModule pm in p.Modules)
{
ModuleNames.Add(pm.moduleName);
}
if (ModuleNames.Contains("RealChuteModule"))
{
if (!realChuteInUse)
{
RCParameter = 0;
}
//First off, get the PPMS since we'll need that
PartModule realChute = p.Modules["RealChuteModule"];
//Assuming that's not somehow null, then we continue
if (realChute != null) //Some of this was adopted from DebRefund, as Vendan's method of handling multiple parachutes is better than what I had.
{
//We make a list of ConfigNodes containing the parachutes (usually 1, but now there can be any number of them)
//We get that from the PPMS
ConfigNode rcNode = new ConfigNode();
realChute.Save(rcNode);
//It's existence means that RealChute is installed and in use on the craft (you could have it installed and use stock chutes, so we only check if it's on the craft)
realChuteInUse = true;
RCParameter += ProcessRealchute(rcNode);
}
}
else if (ModuleNames.Contains("RealChuteFAR")) //RealChute Lite for FAR
{
if (!realChuteInUse)
{
RCParameter = 0;
}
PartModule realChute = p.Modules["RealChuteFAR"];
float diameter = 0.0F; //realChute.moduleValues.GetValue("deployedDiameter")
if (realChute != null)
{
try
{
diameter = realChute.Fields.GetValue <float>("deployedDiameter");
Log.Info($"[SR] Diameter is {diameter}.");
}
catch (Exception e)
{
Debug.LogError("[SR] Exception while finding deployedDiameter for RealChuteFAR module on module.");
Debug.LogException(e);
}
}
else
{
Log.Info("[SR] moduleRef is null, attempting workaround to find diameter.");
object dDefault = p.partInfo.partPrefab.Modules["RealChuteFAR"]?.Fields?.GetValue("deployedDiameter"); //requires C# 6
if (dDefault != null)
{
diameter = Convert.ToSingle(dDefault);
Log.Info($"[SR] Workaround gave a diameter of {diameter}.");
}
else
{
Log.Info("[SR] Couldn't get default value, setting to 0 and calling it a day.");
diameter = 0.0F;
}
}
float dragC = 1.0f; //float.Parse(realChute.moduleValues.GetValue("staticCd"));
RCParameter += (dragC * Mathf.Pow(diameter, 2) * Math.PI / 4.0);
realChuteInUse = true;
}
else if (!realChuteInUse && ModuleNames.Contains("ModuleParachute"))
{
//Credit to m4v and RCSBuildAid: https://github.com/m4v/RCSBuildAid/blob/master/Plugin/CoDMarker.cs
Part part = p ?? p.partInfo.partPrefab; //the part, or the part prefab
DragCubeList dragCubes = part.DragCubes;
dragCubes.SetCubeWeight("DEPLOYED", 1);
dragCubes.SetCubeWeight("SEMIDEPLOYED", 0);
dragCubes.SetCubeWeight("PACKED", 0);
dragCubes.SetOcclusionMultiplier(0);
Quaternion rotation = Quaternion.LookRotation(Vector3d.up);
try
{
rotation = Quaternion.LookRotation(part.partTransform?.InverseTransformDirection(Vector3d.up) ?? Vector3d.up);
}
catch (Exception e)
{
Debug.LogException(e);
}
dragCubes.SetDragVectorRotation(rotation);
}
if (!realChuteInUse)
{
Part part = p ?? p.partInfo.partPrefab; //the part reference, or the part prefab
DragCubeList dragCubes = part.DragCubes;
dragCubes.ForceUpdate(false, true);
dragCubes.SetDragWeights();
dragCubes.SetPartOcclusion();
Vector3 dir = Vector3d.up;
try
{
dir = -part.partTransform?.InverseTransformDirection(Vector3d.down) ?? Vector3d.up;
}
catch (Exception e)
{
//Debug.LogException(e);
Log.Info("[SR] The expected excpetion is still present. " + e.Message);
}
dragCubes.SetDrag(dir, 0.03f); //mach 0.03, or about 10m/s
double dragCoeff = dragCubes.AreaDrag * PhysicsGlobals.DragCubeMultiplier;
RCParameter += (dragCoeff * PhysicsGlobals.DragMultiplier);
}
}
}
catch (Exception e)
{
Debug.LogError("[SR] Error occured while trying to determine total chute area.");
Debug.LogException(e);
}
return(RCParameter);
}
public void update(double curSpeed, double curDensity)
{
maxSpeed = 0;
breakDistance = 0;
curDensity = Math.Max(curDensity, 0.2 * vesselState.mainBody.atmDensityASL);
double curSpeedOfSound = Math.Max(vesselState.speedOfSound, vesselState.mainBody.GetSpeedOfSound(0.2 * vesselState.mainBody.atmPressureASL, 0.2 * vesselState.mainBody.atmDensityASL));
//create List by descending order of maxSpeed with drag and max chute reaction time
SortedList <double, (float, float)> parachuteTypes = new SortedList <double, (float, float)>(Comparer <double> .Create((a, b) => Math.Sign(b - a)));
foreach (var p in vesselState.parachutes)
{
if (p.deploymentState == ModuleParachute.deploymentStates.STOWED)
{
p.refDensity = curDensity;
p.CalcBaseStats();
DragCubeList simParachute = new DragCubeList();
simParachute.LoadCube(p.part.DragCubes, "DEPLOYED");
simParachute.SetPart(p.part);
simParachute.SetOcclusionMultiplier(0f);
simParachute.ResetCubeWeights();
simParachute.SetDragWeights();
simParachute.SetPartOcclusion();
//Debug.Log(String.Format("ParachuteInfo.update Parchute {0} has up Cube area={1:F1} drag={2:F1} weight={3:F1} AreaOccluded={4:F1}",
// p.part.name, simParachute.Cubes[0].Area[(int) DragCube.DragFace.YP], simParachute.Cubes[0].Drag[(int) DragCube.DragFace.YP],
// simParachute.Cubes[0].Weight, simParachute.AreaOccluded[(int)DragCube.DragFace.YP]));
DragCubeList.CubeData simDrag = new DragCubeList.CubeData();
simParachute.AddSurfaceDragDirection(Vector3.up, (float)(p.maxSafeSpeedAtRef / curSpeedOfSound), ref simDrag);
//Debug.Log(String.Format("ParachuteInfo.update Parchute {0} has areaDrag={1:F1}, crossSectionalArea={2:F1}, exposedArea={3:F1}",
// p.part.name, simDrag.areaDrag, simDrag.crossSectionalArea, simDrag.exposedArea));
if (parachuteTypes.ContainsKey(p.maxSafeSpeedAtRef))
{
parachuteTypes[p.maxSafeSpeedAtRef] = (parachuteTypes[p.maxSafeSpeedAtRef].Item1 + simDrag.areaDrag,
Mathf.Max(parachuteTypes[p.maxSafeSpeedAtRef].Item2, p.Anim[p.semiDeployedAnimation].length / p.semiDeploymentSpeed + p.Anim[p.fullyDeployedAnimation].length / p.deploymentSpeed));
}
else
{
parachuteTypes.Add(p.maxSafeSpeedAtRef, (simDrag.areaDrag, p.Anim[p.semiDeployedAnimation].length / p.semiDeploymentSpeed + p.Anim[p.fullyDeployedAnimation].length / p.deploymentSpeed));
}
}
}
float totalFriction = 0;
double lastSpeed = 0;
foreach (var pt in parachuteTypes)
{
double effSpeed = Math.Min(curSpeed, pt.Key);
// base equation deceleration term + chute reaction term with deceleration taken from moving equations with netwon friction
// during reaction time we hardly break, so assume
float friction_const = pt.Value.Item1 * 0.0005f * (float)curDensity * PhysicsGlobals.DragMultiplier
* PhysicsGlobals.DragCubeMultiplier * PhysicsGlobals.DragCurvePseudoReynolds.Evaluate((float)(effSpeed * curDensity));
if (breakDistance == 0) // first term for highest speed
{
breakDistance = (float)vesselState.mass / friction_const * Math.Log(effSpeed) + effSpeed * pt.Value.Item2;
undeployedDistance = effSpeed * pt.Value.Item2;// - vesselState.mass / friction_const ;
maxSpeed = lastSpeed = effSpeed;
totalFriction = friction_const;
//Debug.Log(String.Format("ParachuteInfo.update has first chute type with friction={0:F4} and effSpeed={1:F0}, delay={3:F1} results break dist={2:F0}", friction_const, effSpeed, breakDistance, pt.Value.Item2));
}
else
{
// calculate slowdown during parachute opening using old friction
effSpeed *= (float)vesselState.mass / (totalFriction * pt.Value.Item2 * effSpeed + vesselState.mass);
breakDistance -= (float)vesselState.mass / (totalFriction + friction_const) * friction_const / totalFriction * Math.Log(effSpeed);
undeployedDistance += pt.Value.Item2 * effSpeed;// + vesselState.mass * lastSpeed / (totalFriction * effSpeed) - vesselState.mass / (totalFriction + friction_const);
lastSpeed = effSpeed;
totalFriction += friction_const;
//Debug.Log(String.Format("ParachuteInfo.update has next chute type with friction={0:F4} and effSpeed={1:F0}, delay={3:F1} results break dist={2:F0}", friction_const, effSpeed, breakDistance, pt.Value.Item2));
}
}
if (totalFriction > 0)
{
double terminalSpeed = Math.Sqrt((float)vesselState.mass / totalFriction * vesselState.mainBody.GeeASL * PhysicsGlobals.GravitationalAcceleration);
//we are not getting slower than terminal velocity, so substract this as best guess for integration constant v
breakDistance -= (float)vesselState.mass / totalFriction * Math.Log(terminalSpeed);
//undeployedDistance += vesselState.mass * lastSpeed / (totalFriction * terminalSpeed);
//Debug.Log(String.Format("ParachuteInfo.update has terminal velocity term with friction={0:F4} and terminalSpeed={1:F0} results break dist={2:F0}", totalFriction, terminalSpeed, breakDistance));
}
Debug.Log(String.Format("ParachuteInfo.update for speed={0:F0} gives maxSpeed={1:F0} break dist={2:F0} undeployedDistance={3:F0}", curSpeed, maxSpeed, breakDistance, undeployedDistance));
}
