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VehicleAerodynamics.cs
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VehicleAerodynamics.cs
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/*
Ferram Aerospace Research v0.15.8 "de Laval"
=========================
Aerodynamics model for Kerbal Space Program
Copyright 2015, Michael Ferrara, aka Ferram4
This file is part of Ferram Aerospace Research.
Ferram Aerospace Research is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Ferram Aerospace Research is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Ferram Aerospace Research. If not, see <http://www.gnu.org/licenses/>.
Serious thanks: a.g., for tons of bugfixes and code-refactorings
stupid_chris, for the RealChuteLite implementation
Taverius, for correcting a ton of incorrect values
Tetryds, for finding lots of bugs and issues and not letting me get away with them, and work on example crafts
sarbian, for refactoring code for working with MechJeb, and the Module Manager updates
ialdabaoth (who is awesome), who originally created Module Manager
Regex, for adding RPM support
DaMichel, for some ferramGraph updates and some control surface-related features
Duxwing, for copy editing the readme
CompatibilityChecker by Majiir, BSD 2-clause http://opensource.org/licenses/BSD-2-Clause
Part.cfg changes powered by sarbian & ialdabaoth's ModuleManager plugin; used with permission
http://forum.kerbalspaceprogram.com/threads/55219
ModularFLightIntegrator by Sarbian, Starwaster and Ferram4, MIT: http://opensource.org/licenses/MIT
http://forum.kerbalspaceprogram.com/threads/118088
Toolbar integration powered by blizzy78's Toolbar plugin; used with permission
http://forum.kerbalspaceprogram.com/threads/60863
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using UnityEngine;
using FerramAerospaceResearch.FARThreading;
using FerramAerospaceResearch.FARPartGeometry;
using FerramAerospaceResearch.FARPartGeometry.GeometryModification;
namespace FerramAerospaceResearch.FARAeroComponents
{
class VehicleAerodynamics
{
static double[] indexSqrt = new double[1];
static object _commonLocker = new object();
VehicleVoxel _voxel = null;
VoxelCrossSection[] _vehicleCrossSection = new VoxelCrossSection[1];
double[] _ductedAreaAdjustment = new double[1];
int _voxelCount;
double _length = 0;
public double Length
{
get { return _length; }
}
double _maxCrossSectionArea = 0;
public double MaxCrossSectionArea
{
get { return _maxCrossSectionArea; }
}
bool _calculationCompleted = false;
public bool CalculationCompleted
{
get { return _calculationCompleted; }
}
double _sonicDragArea;
public double SonicDragArea
{
get { return _sonicDragArea; }
}
double _criticalMach;
public double CriticalMach
{
get { return _criticalMach; }
}
Matrix4x4 _worldToLocalMatrix, _localToWorldMatrix;
Vector3d _voxelLowerRightCorner;
double _voxelElementSize;
double _sectionThickness;
public double SectionThickness
{
get { return _sectionThickness; }
}
Vector3 _vehicleMainAxis;
List<Part> _vehiclePartList;
List<GeometryPartModule> _currentGeoModules;
Dictionary<Part, PartTransformInfo> _partWorldToLocalMatrixDict = new Dictionary<Part, PartTransformInfo>(ObjectReferenceEqualityComparer<Part>.Default);
Dictionary<FARAeroPartModule, FARAeroPartModule.ProjectedArea> _moduleAndAreasDict = new Dictionary<FARAeroPartModule, FARAeroPartModule.ProjectedArea>(ObjectReferenceEqualityComparer<FARAeroPartModule>.Default);
List<FARAeroPartModule> _currentAeroModules = new List<FARAeroPartModule>();
List<FARAeroPartModule> _newAeroModules = new List<FARAeroPartModule>();
List<FARAeroPartModule> _currentUnusedAeroModules = new List<FARAeroPartModule>();
List<FARAeroPartModule> _newUnusedAeroModules = new List<FARAeroPartModule>();
List<FARAeroSection> _currentAeroSections = new List<FARAeroSection>();
List<FARAeroSection> _newAeroSections = new List<FARAeroSection>();
List<ferram4.FARWingAerodynamicModel> _legacyWingModels = new List<ferram4.FARWingAerodynamicModel>();
List<ICrossSectionAdjuster> activeAdjusters = new List<ICrossSectionAdjuster>();
//Dictionary<Part, double> adjusterAreaPerVoxelDict = new Dictionary<Part, double>();
//Dictionary<Part, ICrossSectionAdjuster> adjusterPartDict = new Dictionary<Part, ICrossSectionAdjuster>();
List<FARAeroPartModule> includedModules = new List<FARAeroPartModule>();
List<float> weighting = new List<float>();
static Stack<FARAeroSection> currentlyUnusedSections;
int validSectionCount;
int firstSection;
bool visualizing = false;
bool voxelizing = false;
public VehicleAerodynamics()
{
if(currentlyUnusedSections == null)
currentlyUnusedSections = new Stack<FARAeroSection>();
}
public void ForceCleanup()
{
if (_voxel != null)
{
_voxel.CleanupVoxel();
_voxel = null;
}
_vehicleCrossSection = null;
_ductedAreaAdjustment = null;
_currentAeroModules = null;
_newAeroModules = null;
_currentUnusedAeroModules = null;
_newUnusedAeroModules = null;
_currentAeroSections = null;
_newAeroSections = null;
_legacyWingModels = null;
_vehiclePartList = null;
activeAdjusters = null;
}
private double[] GenerateIndexSqrtLookup(int numStations)
{
double[] indexSqrt = new double[numStations];
for (int i = 0; i < numStations; i++)
indexSqrt[i] = Math.Sqrt(i);
return indexSqrt;
}
#region UpdateAeroData
//Used by other classes to update their aeroModule and aeroSection lists
//When these functions fire, all the data that was once restricted to the voxelization thread is passed over to the main unity thread
public void GetNewAeroData(out List<FARAeroPartModule> aeroModules, out List<FARAeroPartModule> unusedAeroModules, out List<FARAeroSection> aeroSections, out List<ferram4.FARWingAerodynamicModel> legacyWingModel)
{
_calculationCompleted = false;
List<FARAeroPartModule> tmpAeroModules = _currentAeroModules;
aeroModules = _currentAeroModules = _newAeroModules;
_newAeroModules = tmpAeroModules;
List<FARAeroSection> tmpAeroSections = _currentAeroSections;
aeroSections = _currentAeroSections = _newAeroSections;
_newAeroSections = tmpAeroSections;
tmpAeroModules = _currentUnusedAeroModules;
unusedAeroModules = _currentUnusedAeroModules = _newUnusedAeroModules;
_newUnusedAeroModules = tmpAeroModules;
legacyWingModel = LEGACY_UpdateWingAerodynamicModels();
}
public void GetNewAeroData(out List<FARAeroPartModule> aeroModules, out List<FARAeroSection> aeroSections)
{
_calculationCompleted = false;
List<FARAeroPartModule> tmpAeroModules = _currentAeroModules;
aeroModules = _currentAeroModules = _newAeroModules;
_newAeroModules = tmpAeroModules;
List<FARAeroSection> tmpAeroSections = _currentAeroSections;
aeroSections = _currentAeroSections = _newAeroSections;
_newAeroSections = tmpAeroSections;
tmpAeroModules = _currentUnusedAeroModules;
_currentUnusedAeroModules = _newUnusedAeroModules;
_newUnusedAeroModules = tmpAeroModules;
LEGACY_UpdateWingAerodynamicModels();
}
private List<ferram4.FARWingAerodynamicModel> LEGACY_UpdateWingAerodynamicModels()
{
_legacyWingModels.Clear();
for (int i = 0; i < _currentAeroModules.Count; i++)
{
Part p = _currentAeroModules[i].part;
if (!p)
continue;
if (p.Modules.Contains<ferram4.FARWingAerodynamicModel>())
{
ferram4.FARWingAerodynamicModel w = p.Modules.GetModule<ferram4.FARWingAerodynamicModel>();
if ((object)w != null)
{
w.isShielded = false;
w.NUFAR_ClearExposedAreaFactor();
_legacyWingModels.Add(w);
}
}
else if (p.Modules.Contains<ferram4.FARControllableSurface>())
{
ferram4.FARWingAerodynamicModel w = p.Modules.GetModule<ferram4.FARControllableSurface>();
if ((object)w != null)
{
w.isShielded = false;
w.NUFAR_ClearExposedAreaFactor();
_legacyWingModels.Add(w);
}
}
}
/*for (int i = 0; i < _currentAeroSections.Count; i++)
{
FARAeroSection sect = _currentAeroSections[i];
sect.LEGACY_SetLiftForFARWingAerodynamicModel();
}*/
for (int i = 0; i < _legacyWingModels.Count; i++)
{
ferram4.FARWingAerodynamicModel w = _legacyWingModels[i];
w.NUFAR_CalculateExposedAreaFactor();
}
for (int i = 0; i < _legacyWingModels.Count; i++)
{
ferram4.FARWingAerodynamicModel w = _legacyWingModels[i];
w.NUFAR_SetExposedAreaFactor();
}
for (int i = 0; i < _legacyWingModels.Count; i++)
{
ferram4.FARWingAerodynamicModel w = _legacyWingModels[i];
w.NUFAR_UpdateShieldingStateFromAreaFactor();
}
return _legacyWingModels;
}
#endregion
#region GetFunctions
//returns various data for use in displaying outside this class
public Matrix4x4 VoxelAxisToLocalCoordMatrix()
{
return Matrix4x4.TRS(Vector3.zero, Quaternion.FromToRotation(_vehicleMainAxis, Vector3.up), Vector3.one);
}
public double FirstSectionXOffset()
{
double offset = Vector3d.Dot(_vehicleMainAxis, _voxelLowerRightCorner);
offset += firstSection * _sectionThickness;
return offset;
}
public double[] GetPressureCoeffs()
{
double[] pressureCoeffs = new double[validSectionCount];
return GetPressureCoeffs(pressureCoeffs);
}
public double[] GetPressureCoeffs(double[] pressureCoeffs)
{
for (int i = firstSection; i < validSectionCount + firstSection; i++)
pressureCoeffs[i - firstSection] = _vehicleCrossSection[i].cpSonicForward;
return pressureCoeffs;
}
public double[] GetCrossSectionAreas()
{
double[] areas = new double[validSectionCount];
return GetCrossSectionAreas(areas);
}
public double[] GetCrossSectionAreas(double[] areas)
{
for (int i = firstSection; i < validSectionCount + firstSection; i++)
areas[i - firstSection] = _vehicleCrossSection[i].area;
return areas;
}
public double[] GetCrossSection2ndAreaDerivs()
{
double[] areaDerivs = new double[validSectionCount];
return GetCrossSection2ndAreaDerivs(areaDerivs);
}
public double[] GetCrossSection2ndAreaDerivs(double[] areaDerivs)
{
for (int i = firstSection; i < validSectionCount + firstSection; i++)
areaDerivs[i - firstSection] = _vehicleCrossSection[i].secondAreaDeriv;
return areaDerivs;
}
#endregion
#region VoxelDebug
//Handling for display of debug voxels
private void ClearDebugVoxel()
{
_voxel.ClearVisualVoxels();
visualizing = false;
}
private void DisplayDebugVoxels(Matrix4x4 localToWorldMatrix)
{
_voxel.VisualizeVoxel(localToWorldMatrix);
visualizing = true;
}
public void DebugVisualizeVoxels(Matrix4x4 localToWorldMatrix)
{
if (visualizing)
ClearDebugVoxel();
else
DisplayDebugVoxels(localToWorldMatrix);
}
#endregion
#region Voxelization
//This function will attempt to voxelize the vessel, as long as it isn't being voxelized currently all data that is on the Unity thread should be processed here before being passed to the other threads
public bool TryVoxelUpdate(Matrix4x4 worldToLocalMatrix, Matrix4x4 localToWorldMatrix, int voxelCount, List<Part> vehiclePartList, List<GeometryPartModule> currentGeoModules, bool updateGeometryPartModules = true)
{
bool returnVal = false;
if (voxelizing) //set to true when this function ends; only continue to voxelizing if the voxelization thread has not been queued
{ //this should catch conditions where this function is called again before the voxelization thread starts
returnVal = false;
}
else if (Monitor.TryEnter(this, 0)) //only continue if the voxelizing thread has not locked this object
{
try
{
_calculationCompleted = false; //ensure that the main thread isn't going to try to read the updated section data while it is being worked with
//Bunch of voxel setup data
_voxelCount = voxelCount;
this._worldToLocalMatrix = worldToLocalMatrix;
this._localToWorldMatrix = localToWorldMatrix;
this._vehiclePartList = vehiclePartList;
this._currentGeoModules = currentGeoModules;
_partWorldToLocalMatrixDict.Clear();
for (int i = 0; i < _currentGeoModules.Count; i++)
{
GeometryPartModule g = _currentGeoModules[i];
_partWorldToLocalMatrixDict.Add(g.part, new PartTransformInfo(g.part.partTransform));
if (updateGeometryPartModules)
g.UpdateTransformMatrixList(_worldToLocalMatrix);
}
this._vehicleMainAxis = CalculateVehicleMainAxis();
//If the voxel still exists, cleanup everything so we can continue;
visualizing = false;
if (_voxel != null)
{
_voxel.CleanupVoxel();
}
//set flag so that this function can't run again before voxelizing completes and queue voxelizing thread
voxelizing = true;
VoxelizationThreadpool.Instance.QueueVoxelization(CreateVoxel);
returnVal = true;
}
finally
{
Monitor.Exit(this);
}
}
return returnVal;
}
//And this actually creates the voxel and then begins the aero properties determination
private void CreateVoxel()
{
lock (this) //lock this object to prevent race with main thread
{
try
{
//Actually voxelize it
_voxel = VehicleVoxel.CreateNewVoxel(_vehiclePartList, _currentGeoModules, _voxelCount);
if (_vehicleCrossSection.Length < _voxel.MaxArrayLength)
_vehicleCrossSection = _voxel.EmptyCrossSectionArray;
_voxelLowerRightCorner = _voxel.LocalLowerRightCorner;
_voxelElementSize = _voxel.ElementSize;
CalculateVesselAeroProperties();
_calculationCompleted = true;
}
catch (Exception e)
{
ThreadSafeDebugLogger.Instance.RegisterException(e);
}
finally
{
//Always, when we finish up, if we're in flight, cleanup the voxel
if (HighLogic.LoadedSceneIsFlight && _voxel != null)
{
_voxel.CleanupVoxel();
_voxel = null;
}
//And unset the flag so that the main thread can queue it again
voxelizing = false;
}
}
}
#endregion
private Vector3 CalculateVehicleMainAxis()
{
Vector3 axis = Vector3.zero;
//Vector3 notAxis = Vector3.zero;
HashSet<Part> hitParts = new HashSet<Part>();
bool hasPartsForAxis = false;
for (int i = 0; i < _vehiclePartList.Count; i++)
{
Part p = _vehiclePartList[i];
if (p == null || hitParts.Contains(p))
continue;
GeometryPartModule geoModule = null;
geoModule = p.Modules.GetModule<GeometryPartModule>(); // Could be left null if a launch clamp
hitParts.Add(p);
Vector3 tmpCandVector = Vector3.zero;
Vector3 candVector = Vector3.zero;
if (p.Modules.Contains<ModuleResourceIntake>()) //intakes are probably pointing in the direction we're gonna be going in
{
ModuleResourceIntake intake = p.Modules.GetModule<ModuleResourceIntake>();
Transform intakeTrans = p.FindModelTransform(intake.intakeTransformName);
if ((object)intakeTrans != null)
candVector = intakeTrans.TransformDirection(Vector3.forward);
}
else if (geoModule == null || geoModule.IgnoreForMainAxis || p.Modules.Contains<ferram4.FARWingAerodynamicModel>() || p.Modules.Contains<ferram4.FARControllableSurface>() || p.Modules.Contains<ModuleWheelBase>() || p.Modules.Contains("KSPWheelBase")) //aggregate wings for later calc...
{
continue;
}
else
{
if (p.srfAttachNode != null && p.srfAttachNode.attachedPart != null)// && p.attachRules.allowSrfAttach)
{
tmpCandVector = p.srfAttachNode.orientation;
tmpCandVector = new Vector3(0, Math.Abs(tmpCandVector.x) + Math.Abs(tmpCandVector.z), Math.Abs(tmpCandVector.y));
if (p.srfAttachNode.position.sqrMagnitude == 0 && tmpCandVector == Vector3.forward)
tmpCandVector = Vector3.up;
if (tmpCandVector.z > tmpCandVector.x && tmpCandVector.z > tmpCandVector.y)
tmpCandVector = Vector3.forward;
else if (tmpCandVector.y > tmpCandVector.x && tmpCandVector.y > tmpCandVector.z)
tmpCandVector = Vector3.up;
else
tmpCandVector = Vector3.right;
}
else
{
tmpCandVector = Vector3.up;
}
candVector = p.partTransform.TransformDirection(tmpCandVector);
}
for (int j = 0; j < p.symmetryCounterparts.Count; j++)
{
Part q = p.symmetryCounterparts[j];
if (q == null || hitParts.Contains(q))
continue;
hitParts.Add(q);
if (q.Modules.Contains<ModuleResourceIntake>()) //intakes are probably pointing in the direction we're gonna be going in
{
ModuleResourceIntake intake = q.Modules.GetModule<ModuleResourceIntake>();
Transform intakeTrans = q.FindModelTransform(intake.intakeTransformName);
if ((object)intakeTrans != null)
candVector += intakeTrans.TransformDirection(Vector3.forward);
}
else
candVector += q.partTransform.TransformDirection(tmpCandVector);
}
hasPartsForAxis = true; //set that we will get a valid axis out of this operation
candVector = _worldToLocalMatrix.MultiplyVector(candVector);
candVector.x = Math.Abs(candVector.x);
candVector.y = Math.Abs(candVector.y);
candVector.z = Math.Abs(candVector.z);
Vector3 size = geoModule.overallMeshBounds.size;
axis += candVector * size.x * size.y * size.z;// *(1 + p.symmetryCounterparts.Count); //scale part influence by approximate size
}
if (axis == Vector3.zero)
axis = Vector3.up; //something in case things fall through somehow
if (hasPartsForAxis)
{
float dotProdX, dotProdY, dotProdZ;
dotProdX = Math.Abs(Vector3.Dot(axis, Vector3.right));
dotProdY = Math.Abs(Vector3.Dot(axis, Vector3.up));
dotProdZ = Math.Abs(Vector3.Dot(axis, Vector3.forward));
if (dotProdY > 2 * dotProdX && dotProdY > 2 * dotProdZ)
return Vector3.up;
if (dotProdX > 2 * dotProdY && dotProdX > 2 * dotProdZ)
return Vector3.right;
if (dotProdZ > 2 * dotProdX && dotProdZ > 2 * dotProdY)
return Vector3.forward;
//Otherwise, now we need to use axis, since it's obviously not close to anything else
return axis.normalized;
}
else
return Vector3.up; //welp, no parts that we can rely on for determining the axis; fall back to up
}
//Smooths out area and area 2nd deriv distributions to deal with noise in the representation
unsafe void GaussianSmoothCrossSections(VoxelCrossSection[] vehicleCrossSection, double stdDevCutoff, double lengthPercentFactor, double sectionThickness, double length, int frontIndex, int backIndex, int areaSmoothingIterations, int derivSmoothingIterations)
{
double stdDev = length * lengthPercentFactor;
int numVals = (int)Math.Ceiling(stdDevCutoff * stdDev / sectionThickness);
if (numVals <= 1)
return;
double* gaussianFactors = stackalloc double[numVals];
double* prevUncorrectedVals = stackalloc double[numVals];
double* futureUncorrectedVals = stackalloc double[numVals - 1];
/* double[] gaussianFactors = new double[numVals];
double[] prevUncorrectedVals = new double[numVals];
double[] futureUncorrectedVals = new double[numVals - 1];*/
double invVariance = 1 / (stdDev * stdDev);
//calculate Gaussian factors for each of the points that will be hit
for (int i = 0; i < numVals; i++)
{
double factor = (i * sectionThickness);
factor *= factor;
gaussianFactors[i] = Math.Exp(-0.5 * factor * invVariance);
}
//then sum them up...
double sum = 0;
for (int i = 0; i < numVals; i++)
if (i == 0)
sum += gaussianFactors[i];
else
sum += 2 * gaussianFactors[i];
double invSum = 1 / sum; //and then use that to normalize the factors
for (int i = 0; i < numVals; i++)
{
gaussianFactors[i] *= invSum;
}
//first smooth the area itself. This has a greater effect on the 2nd deriv due to the effect of noise on derivatives
for (int j = 0; j < areaSmoothingIterations; j++)
{
for (int i = 0; i < numVals; i++)
prevUncorrectedVals[i] = vehicleCrossSection[frontIndex].area; //set all the vals to 0 to prevent screwups between iterations
for (int i = frontIndex; i <= backIndex; i++) //area smoothing pass
{
for (int k = numVals - 1; k > 0; k--)
{
prevUncorrectedVals[k] = prevUncorrectedVals[k - 1]; //shift prev vals down
}
double curValue = vehicleCrossSection[i].area;
prevUncorrectedVals[0] = curValue; //and set the central value
for (int k = 0; k < numVals - 1; k++) //update future vals
{
if (i + k < backIndex)
futureUncorrectedVals[k] = vehicleCrossSection[i + k + 1].area;
else
futureUncorrectedVals[k] = vehicleCrossSection[backIndex].area;
}
curValue = 0; //zero for coming calculations...
double borderScaling = 1; //factor to correct for the 0s lurking at the borders of the curve...
for (int k = 0; k < numVals; k++)
{
double val = prevUncorrectedVals[k];
double gaussianFactor = gaussianFactors[k];
curValue += gaussianFactor * val; //central and previous values;
if (val == 0)
borderScaling -= gaussianFactor;
}
for (int k = 0; k < numVals - 1; k++)
{
double val = futureUncorrectedVals[k];
double gaussianFactor = gaussianFactors[k + 1];
curValue += gaussianFactor * val; //future values
if (val == 0)
borderScaling -= gaussianFactor;
}
if (borderScaling > 0)
curValue /= borderScaling; //and now all of the 0s beyond the edge have been removed
vehicleCrossSection[i].area = curValue;
}
}
CalculateCrossSectionSecondDerivs(vehicleCrossSection, numVals, frontIndex, backIndex, sectionThickness);
//and now smooth the derivs
for (int j = 0; j < derivSmoothingIterations; j++)
{
for (int i = 0; i < numVals; i++)
prevUncorrectedVals[i] = vehicleCrossSection[frontIndex].secondAreaDeriv; //set all the vals to 0 to prevent screwups between iterations
for (int i = frontIndex; i <= backIndex; i++) //deriv smoothing pass
{
for (int k = numVals - 1; k > 0; k--)
{
prevUncorrectedVals[k] = prevUncorrectedVals[k - 1]; //shift prev vals down
}
double curValue = vehicleCrossSection[i].secondAreaDeriv;
prevUncorrectedVals[0] = curValue; //and set the central value
for (int k = 0; k < numVals - 1; k++) //update future vals
{
if (i + k < backIndex)
futureUncorrectedVals[k] = vehicleCrossSection[i + k + 1].secondAreaDeriv;
else
futureUncorrectedVals[k] = vehicleCrossSection[backIndex].secondAreaDeriv;
}
curValue = 0; //zero for coming calculations...
double borderScaling = 1; //factor to correct for the 0s lurking at the borders of the curve...
for (int k = 0; k < numVals; k++)
{
double val = prevUncorrectedVals[k];
double gaussianFactor = gaussianFactors[k];
curValue += gaussianFactor * val; //central and previous values;
if (val == 0)
borderScaling -= gaussianFactor;
}
for (int k = 0; k < numVals - 1; k++)
{
double val = futureUncorrectedVals[k];
double gaussianFactor = gaussianFactors[k + 1];
curValue += gaussianFactor * val; //future values
if (val == 0)
borderScaling -= gaussianFactor;
}
if (borderScaling > 0)
curValue /= borderScaling; //and now all of the 0s beyond the edge have been removed
vehicleCrossSection[i].secondAreaDeriv = curValue;
}
}
}
//Based on http://www.holoborodko.com/pavel/downloads/NoiseRobustSecondDerivative.pdf
unsafe void CalculateCrossSectionSecondDerivs(VoxelCrossSection[] vehicleCrossSection, int oneSidedFilterLength, int frontIndex, int backIndex, double sectionThickness)
{
int M, N;
if (oneSidedFilterLength < 2)
{
oneSidedFilterLength = 2;
ThreadSafeDebugLogger.Instance.RegisterMessage("Needed to adjust filter length up");
}
else if (oneSidedFilterLength > 40)
{
oneSidedFilterLength = 40;
ThreadSafeDebugLogger.Instance.RegisterMessage("Reducing filter length to prevent overflow");
}
M = oneSidedFilterLength;
N = M * 2 + 1;
long* sK = stackalloc long[M + 1];
//double* areas = stackalloc double[N + 2];
for (int i = 0; i <= M; i++)
{
sK[i] = CalculateSk(i, M, N);
}
double denom = Math.Pow(2, N - 3);
denom *= sectionThickness * sectionThickness;
denom = 1 / denom;
int lowIndex, highIndex;
lowIndex = Math.Max(frontIndex - 1, 0);
highIndex = Math.Min(backIndex + 1, vehicleCrossSection.Length - 1);
for (int i = lowIndex + M; i <= highIndex - M; i++)
{
double secondDeriv = 0;
if(i >= frontIndex && i <= backIndex)
secondDeriv = sK[0] * vehicleCrossSection[i].area;
for (int k = 1; k <= M; k++)
{
double forwardArea, backwardArea;
if (i + k <= backIndex)
backwardArea = vehicleCrossSection[i + k].area;
else
backwardArea = 0;// (vehicleCrossSection[backIndex].area - vehicleCrossSection[backIndex - 1].area) * (i + k - backIndex) + vehicleCrossSection[backIndex].area;
if (i - k >= frontIndex)
forwardArea = vehicleCrossSection[i - k].area;
else
forwardArea = 0;// (vehicleCrossSection[frontIndex].area - vehicleCrossSection[frontIndex + 1].area) * (i - k - frontIndex) + vehicleCrossSection[frontIndex].area; ;// vehicleCrossSection[frontIndex].area;
secondDeriv += sK[k] * (forwardArea + backwardArea);
}
vehicleCrossSection[i].secondAreaDeriv = secondDeriv * denom;
//ThreadSafeDebugLogger.Instance.RegisterMessage(vehicleCrossSection[i].secondAreaDeriv.ToString());
}
//forward difference
for (int i = frontIndex; i < lowIndex + M; i++)
{
double secondDeriv = 0;
secondDeriv += vehicleCrossSection[i].area;
if(i + 2 <= backIndex)
secondDeriv += vehicleCrossSection[i + 2].area;
if (i + 1 <= backIndex)
secondDeriv -= 2 * vehicleCrossSection[i + 1].area;
secondDeriv /= sectionThickness * sectionThickness;
vehicleCrossSection[i].secondAreaDeriv = secondDeriv;
}
//backward difference
for (int i = highIndex - M + 1; i <= backIndex; i++)
{
double secondDeriv = 0;
secondDeriv += vehicleCrossSection[i].area;
if (i - 2 >= frontIndex)
secondDeriv += vehicleCrossSection[i - 2].area;
if (i - 1 >= frontIndex)
secondDeriv -= 2 * vehicleCrossSection[i - 1].area;
secondDeriv /= sectionThickness * sectionThickness;
vehicleCrossSection[i].secondAreaDeriv = secondDeriv;
}
}
long CalculateSk(long k, int M, int N)
{
if (k > M)
return 0;
if (k == M)
return 1;
long val = (2 * N - 10) * CalculateSk(k + 1, M, N);
val -= (N + 2 * k + 3) * CalculateSk(k + 2, M, N);
val /= (N - 2 * k - 1);
return val;
}
unsafe void AdjustCrossSectionForAirDucting(VoxelCrossSection[] vehicleCrossSection, List<GeometryPartModule> geometryModules, int front, int back, ref double maxCrossSectionArea)
{
//double* areaAdjustment = stackalloc double[vehicleCrossSection.Length];
for (int i = 0; i < geometryModules.Count; i++)
{
GeometryPartModule g = geometryModules[i];
g.GetICrossSectionAdjusters(activeAdjusters, _worldToLocalMatrix, _vehicleMainAxis);
}
double intakeArea = 0;
double engineExitArea = 0;
for (int i = 0; i < activeAdjusters.Count; i++) //get all forward facing engines / intakes
{
ICrossSectionAdjuster adjuster = activeAdjusters[i];
if (adjuster is AirbreathingEngineCrossSectonAdjuster)
engineExitArea += Math.Abs(adjuster.AreaRemovedFromCrossSection());
if (adjuster is IntakeCrossSectionAdjuster)
intakeArea += Math.Abs(adjuster.AreaRemovedFromCrossSection());
if(adjuster is IntegratedIntakeEngineCrossSectionAdjuster)
{
engineExitArea += Math.Abs(adjuster.AreaRemovedFromCrossSection());
intakeArea += Math.Abs(adjuster.AreaRemovedFromCrossSection());
}
}
//ThreadSafeDebugLogger.Instance.RegisterMessage(intakeArea + " " + engineExitArea);
if (intakeArea != 0 && engineExitArea != 0) //if they exist, go through the calculations
{
if (_ductedAreaAdjustment.Length != vehicleCrossSection.Length)
_ductedAreaAdjustment = new double[vehicleCrossSection.Length];
int frontMostIndex = -1, backMostIndex = -1;
//sweep through entire vehicle
for (int i = 0; i < _ductedAreaAdjustment.Length; i++)
{
double ductedArea = 0; //area based on the voxel size
//double actualArea = 0; //area based on intake and engine data
double voxelCountScale = _voxelElementSize * _voxelElementSize;
//and all the intakes / engines
if (i >= front && i <= back)
{
for (int j = 0; j < activeAdjusters.Count; j++)
{
ICrossSectionAdjuster adjuster = activeAdjusters[j];
if (adjuster.IntegratedCrossSectionIncreaseDecrease())
continue;
if (adjuster.AreaRemovedFromCrossSection() == 0)
continue;
VoxelCrossSection.SideAreaValues val;
Part p = adjuster.GetPart();
//see if you can find that in this section
if (vehicleCrossSection[i].partSideAreaValues.TryGetValue(p, out val))
{
if (adjuster.AreaRemovedFromCrossSection() > 0)
{
//actualArea += adjuster.AreaRemovedFromCrossSection();
ductedArea += Math.Max(0, val.crossSectionalAreaCount * voxelCountScale + adjuster.AreaThreshold());
}
else
{
//actualArea -= adjuster.AreaRemovedFromCrossSection();
ductedArea -= Math.Max(0, val.crossSectionalAreaCount * voxelCountScale + adjuster.AreaThreshold());
}
}
}
ductedArea *= 0.75;
//if (Math.Abs(actualArea) < Math.Abs(ductedArea))
// ductedArea = actualArea;
if (ductedArea != 0)
if (frontMostIndex < 0)
frontMostIndex = i;
else
backMostIndex = i;
}
_ductedAreaAdjustment[i] = ductedArea;
}
double tmpArea = _ductedAreaAdjustment[0];
for (int i = 1; i < _ductedAreaAdjustment.Length; i++)
{
double areaAdjustment = _ductedAreaAdjustment[i];
double prevAreaAdjustment = tmpArea;
tmpArea = areaAdjustment; //store for next iteration
if (areaAdjustment > 0 && prevAreaAdjustment > 0)
{
double areaChange = areaAdjustment - prevAreaAdjustment;
if (areaChange > 0)
_ductedAreaAdjustment[i] = areaChange; //this transforms this into a change in area, but only for increases (intakes)
else
{
tmpArea = prevAreaAdjustment;
_ductedAreaAdjustment[i] = 0;
}
}
}
tmpArea = _ductedAreaAdjustment[_ductedAreaAdjustment.Length - 1];
for (int i = _ductedAreaAdjustment.Length - 1; i >= 0; i--)
{
double areaAdjustment = _ductedAreaAdjustment[i];
double prevAreaAdjustment = tmpArea;
tmpArea = areaAdjustment; //store for next iteration
if (areaAdjustment < 0 && prevAreaAdjustment < 0)
{
double areaChange = areaAdjustment - prevAreaAdjustment;
if (areaChange < 0)
_ductedAreaAdjustment[i] = areaChange; //this transforms this into a change in area, but only for decreases (engines)
else
{
tmpArea = prevAreaAdjustment;
_ductedAreaAdjustment[i] = 0;
}
}
}
for (int i = _ductedAreaAdjustment.Length - 1; i >= 0; i--)
{
double areaAdjustment = 0;
for (int j = 0; j <= i; j++)
areaAdjustment += _ductedAreaAdjustment[j];
_ductedAreaAdjustment[i] = areaAdjustment;
//ThreadSafeDebugLogger.Instance.RegisterMessage(areaAdjustment.ToString());
}
for (int i = 0; i < vehicleCrossSection.Length; i++)
{
double ductedArea = 0; //area based on the voxel size
double actualArea = 0; //area based on intake and engine data
//and all the intakes / engines
for (int j = 0; j < activeAdjusters.Count; j++)
{
ICrossSectionAdjuster adjuster = activeAdjusters[j];
if (!adjuster.IntegratedCrossSectionIncreaseDecrease())
continue;
VoxelCrossSection.SideAreaValues val;
Part p = adjuster.GetPart();
//see if you can find that in this section
if (vehicleCrossSection[i].partSideAreaValues.TryGetValue(p, out val))
{
ductedArea += val.crossSectionalAreaCount;
actualArea += adjuster.AreaRemovedFromCrossSection();
}
//ThreadSafeDebugLogger.Instance.RegisterMessage(ductedArea.ToString());