PxVehicleDriveSimData4W Vehicle::initDriveSimData(PxVehicleWheelsSimData* wheelsSimData) {
PxVehicleDriveSimData4W driveSimData;
//Diff
PxVehicleDifferential4WData diff;
diff.mType = PxVehicleDifferential4WData::eDIFF_TYPE_LS_4WD;
driveSimData.setDiffData(diff);
//Engine
PxVehicleEngineData engine;
engine.mPeakTorque = 500.0f;
engine.mMaxOmega = 300.0f;//approx 6000 rpm
driveSimData.setEngineData(engine);
// TODO: Don't want gears. Will
// Changing switch time to 0 be good enough for that?
//Gears
PxVehicleGearsData gears;
gears.mSwitchTime = 0.0f;
driveSimData.setGearsData(gears);
//Clutch
PxVehicleClutchData clutch;
clutch.mStrength = 10.0f;
driveSimData.setClutchData(clutch);
//Ackermann steer accuracy
PxVehicleAckermannGeometryData ackermann;
ackermann.mAccuracy = 1.0f;
ackermann.mAxleSeparation =
wheelsSimData->getWheelCentreOffset(PxVehicleDrive4WWheelOrder::eFRONT_LEFT).z -
wheelsSimData->getWheelCentreOffset(PxVehicleDrive4WWheelOrder::eREAR_LEFT).z;
ackermann.mFrontWidth =
wheelsSimData->getWheelCentreOffset(PxVehicleDrive4WWheelOrder::eFRONT_RIGHT).x -
wheelsSimData->getWheelCentreOffset(PxVehicleDrive4WWheelOrder::eFRONT_LEFT).x;
ackermann.mRearWidth =
wheelsSimData->getWheelCentreOffset(PxVehicleDrive4WWheelOrder::eREAR_RIGHT).x -
wheelsSimData->getWheelCentreOffset(PxVehicleDrive4WWheelOrder::eREAR_LEFT).x;
driveSimData.setAckermannGeometryData(ackermann);
return driveSimData;
}
void SetupDriveHelper(const UWheeledVehicleMovementComponent4W* VehicleData, const PxVehicleWheelsSimData* PWheelsSimData, PxVehicleDriveSimData4W& DriveData)
{
PxVehicleDifferential4WData DifferentialSetup;
GetVehicleDifferential4WSetup(VehicleData->DifferentialSetup, DifferentialSetup);
DriveData.setDiffData(DifferentialSetup);
PxVehicleEngineData EngineSetup;
GetVehicleEngineSetup(VehicleData->EngineSetup, EngineSetup);
DriveData.setEngineData(EngineSetup);
PxVehicleClutchData ClutchSetup;
ClutchSetup.mStrength = VehicleData->ClutchStrength;
DriveData.setClutchData(ClutchSetup);
FVector WheelCentreOffsets[4];
WheelCentreOffsets[PxVehicleDrive4WWheelOrder::eFRONT_LEFT] = P2UVector(PWheelsSimData->getWheelCentreOffset(PxVehicleDrive4WWheelOrder::eFRONT_LEFT));
WheelCentreOffsets[PxVehicleDrive4WWheelOrder::eFRONT_RIGHT] = P2UVector(PWheelsSimData->getWheelCentreOffset(PxVehicleDrive4WWheelOrder::eFRONT_RIGHT));
WheelCentreOffsets[PxVehicleDrive4WWheelOrder::eREAR_LEFT] = P2UVector(PWheelsSimData->getWheelCentreOffset(PxVehicleDrive4WWheelOrder::eREAR_LEFT));
WheelCentreOffsets[PxVehicleDrive4WWheelOrder::eREAR_RIGHT] = P2UVector(PWheelsSimData->getWheelCentreOffset(PxVehicleDrive4WWheelOrder::eREAR_RIGHT));
PxVehicleAckermannGeometryData AckermannSetup;
AckermannSetup.mAccuracy = VehicleData->AckermannAccuracy;
AckermannSetup.mAxleSeparation = FMath::Abs(WheelCentreOffsets[PxVehicleDrive4WWheelOrder::eFRONT_LEFT].X - WheelCentreOffsets[PxVehicleDrive4WWheelOrder::eREAR_LEFT].X);
AckermannSetup.mFrontWidth = FMath::Abs(WheelCentreOffsets[PxVehicleDrive4WWheelOrder::eFRONT_RIGHT].Y - WheelCentreOffsets[PxVehicleDrive4WWheelOrder::eFRONT_LEFT].Y);
AckermannSetup.mRearWidth = FMath::Abs(WheelCentreOffsets[PxVehicleDrive4WWheelOrder::eREAR_RIGHT].Y - WheelCentreOffsets[PxVehicleDrive4WWheelOrder::eREAR_LEFT].Y);
DriveData.setAckermannGeometryData(AckermannSetup);
PxVehicleGearsData GearSetup;
GetVehicleGearSetup(VehicleData->GearSetup, GearSetup);
DriveData.setGearsData(GearSetup);
PxVehicleAutoBoxData AutoBoxSetup;
GetVehicleAutoBoxSetup(VehicleData->AutoBoxSetup, AutoBoxSetup);
DriveData.setAutoBoxData(AutoBoxSetup);
}
bool CTank::CreateTankActor( CPhysX * pPhysX )
{
if( !LoadData( "InitShader.lua" ) )
return false;
// CParamTank* pParamTank = new CParamTank;
//
// if( !CLua::LoadParamTank( "", &pParamTank ) )
// {
//
// }
if( GameObject * pBody = GetDetail( BODY ) )
{
if ( pBody->CreateTriangleMesh( pPhysX ) )
{
pBody->Update( 0.f );
PxTriangleMesh* triangleMesh = pBody->GetTriangleMesh();
D3DXVECTOR3 Position = pBody->GetPosition();
//D3DXComputeBoundingBox(Vertices, g_pMesh->GetNumVertices(), FVFVertexSize, &pMin, &pMax);
//PxRigidDynamic* pRigDynAct = pPhysX->GetPhysics()->createRigidDynamic( PxTransform( physx::PxVec3( Position.x, Position.y, Position.z ) ) );
// PxRigidDynamic* pRigDynAct = PxCreateDynamic( *pPhysX->GetPhysics(), PxTransform( physx::PxVec3( Position.x, Position.y, Position.z ) ), PxBoxGeometry( 14.f, 4.6f, 6.f ), *pMaterial, 1.f );
//
// if( pRigDynAct && pMaterial && triangleMesh )
// {
// //pRigDynAct->createShape( PxTriangleMeshGeometry( triangleMesh ), *pMaterial );
//
// pRigDynAct->setRigidDynamicFlag(PxRigidDynamicFlag::eKINEMATIC, false);
// pRigDynAct->setActorFlag( PxActorFlag::eVISUALIZATION, true );
// pRigDynAct->setAngularDamping( 0.5f );
// //pRigDynAct->setMass( 10000.f );
// PxRigidBodyExt::updateMassAndInertia( *pRigDynAct, 10.f );
//
// if( pMaterial )
// pPhysX->PushMaterial( pMaterial );
//
// pPhysX->AddActorScene( pRigDynAct );
// m_pActor = pRigDynAct;
//
// return true;
// }
const int nWheels = 12;
PxF32 chassisMass = 1500.f;
const PxF32 wheelMass = 50.f;
PxF32 fShift = -0.85f;
PxVec3 wheelCentreOffsets[ nWheels ];
for( int i = 0; i < nWheels/2; ++i )
{
wheelCentreOffsets[ i*2 ] = PxVec3( -1.2f, -0.5f, 2.1f + i * fShift );
wheelCentreOffsets[ i*2+1 ] = PxVec3( 1.2f, -0.5f, 2.1f + i * fShift );
}
// размеры корпуса
const PxVec3 chassisDims( 2.4f, 1.f, 6.f );// = computeChassisAABBDimensions(chassisConvexMesh);
// Начало координат находится в центре шасси сетки
// Установить центр масс будет ниже этой точки
const PxVec3 chassisCMOffset = PxVec3( 0.f, -chassisDims.y * 0.5f - 0.65f, 0.f );
PxVehicleWheelsSimData* wheelsSimData = PxVehicleWheelsSimData::allocate( nWheels );
PxVehicleWheelsSimData& wheelsData = *wheelsSimData;
PxVehicleDriveSimData4W driveData;
PxVec3 chassisMOI( (chassisDims.y*chassisDims.y + chassisDims.z * chassisDims.z) * chassisMass / 12.f,
(chassisDims.x*chassisDims.x + chassisDims.z * chassisDims.z) * chassisMass / 12.f,
(chassisDims.x*chassisDims.x + chassisDims.y * chassisDims.y) * chassisMass / 12.f);
// структура шасси
PxVehicleChassisData chassisData;
chassisData.mMass = chassisMass; // Масса транспортного средства жесткой актер тела
chassisData.mMOI = chassisMOI; // Момент инерции автомобиля жесткая актер тела.
chassisData.mCMOffset = chassisCMOffset; // Центр масс смещение автомобиля жесткая актер тела.
// Немного настройки здесь.Автомобиль будет иметь более отзывчивым поворот, если мы сведем
// у-компоненты шасси момента инерции.
chassisMOI.y *= 0.8f;
const PxF32 massRear = 0.5f * chassisMass * ( chassisDims.z - 3 * chassisCMOffset.z ) / chassisDims.z;
const PxF32 massFront = massRear;
//Extract the wheel radius and width from the wheel convex meshes
PxF32 wheelWidths[ nWheels ] = {0.f};
PxF32 wheelRadii[ nWheels ] = {0.f};
for( PxU32 i = 0; i < nWheels; ++i )
{
wheelWidths[ i ] = 0.5f;
wheelRadii [ i ] = 0.32f;
}
// Теперь вычислим колеса массы и инерции компонентов вокруг оси оси
PxF32 wheelMOIs[ nWheels ];
for( PxU32 i = 0; i < nWheels; ++i )
{
wheelMOIs[ i ] = 0.5f * wheelMass * wheelRadii[ i ] * wheelRadii[ i ];
}
// Давайте создадим структуру данных колеса теперь с радиусом, массы и МВД
PxVehicleWheelData wheels[ nWheels ];
for(PxU32 i = 0; i < nWheels; ++i )
{
wheels[ i ].mRadius = wheelRadii[ i ]; // Радиус блок, который включает в себя колеса металл плюс резиновые шины
wheels[ i ].mMass = wheelMass; // Масса колеса плюс шины
wheels[ i ].mMOI = wheelMOIs[ i ]; // Момент инерции колеса
wheels[ i ].mWidth = wheelWidths[ i ]; // Максимальная ширина блок, который включает в себя колеса плюс шин
//wheels[ i ].mMaxHandBrakeTorque = 0.f; // Отключение стояночного тормоза от передних колес и позволяют для задних колес
//wheels[ i ].mMaxSteer = 0.f; // Включить рулевого управления для передних колес и отключить для передних колес
//wheels[ i ].mDampingRate = 1.f; // Скорость затухания описывает скорость, с которой свободно вращающееся колесо теряет скорость вращения
}
//Let's set up the tire data structures now.
//Put slicks on the front tires and wets on the rear tires.
PxVehicleTireData tires[ nWheels ];
for(PxU32 i = 0; i < nWheels; ++i )
{
tires[ i ].mType = 1; // тип сцепления шин с поверхностью
}
// Структура данных подвески
PxVehicleSuspensionData susps[ nWheels ];
for( PxU32 i = 0; i < nWheels; i++ )
{
susps[ i ].mMaxCompression = 0.03f; // Максимальное сжатие пружинной подвески
susps[ i ].mMaxDroop = 0.03f; // Максимальное удлинение пружинной подвески
susps[ i ].mSpringStrength = 20000.f; // пружинная сила подвески блока
susps[ i ].mSpringDamperRate = 500.f;
susps[ i ].mSprungMass = chassisMass / nWheels; // Масса транспортного средства, которая поддерживается пружинная подвеска, указанных в кг.
}
PxVec3 suspTravelDirections[ nWheels ];
PxVec3 wheelCentreCMOffsets[ nWheels ];
PxVec3 suspForceAppCMOffsets[ nWheels ];
PxVec3 tireForceAppCMOffsets[ nWheels ];
for( PxU32 i = 0 ; i < nWheels; ++i )
{
wheelCentreCMOffsets [ i ] = wheelCentreOffsets[ i ] - chassisCMOffset;
suspForceAppCMOffsets[ i ] = PxVec3( wheelCentreCMOffsets[ i ].x, -0.3f, wheelCentreCMOffsets[ i ].z );
tireForceAppCMOffsets[ i ] = PxVec3( wheelCentreCMOffsets[ i ].x, -0.3f, wheelCentreCMOffsets[ i ].z );
suspTravelDirections [ i ] = PxVec3( 0, -1, 0 ); // направление подвески
}
// Теперь добавьте колеса, шины и подвеска данных
for( PxU32 i = 0; i < nWheels; ++i )
{
wheelsData.setWheelData( i, wheels[ i ] ); // установить данные колеса
wheelsData.setTireData( i, tires[ i ] ); // Установите шину данных колеса
wheelsData.setSuspensionData( i, susps[ i ] ); // Установите подвеску данные колеса
wheelsData.setSuspTravelDirection( i, suspTravelDirections[ i ] ); // Установить направление движения подвески колес
wheelsData.setWheelCentreOffset( i, wheelCentreCMOffsets[ i ] ); // Установить смещение от центра жесткой тело массой в центре колеса
wheelsData.setSuspForceAppPointOffset( i, suspForceAppCMOffsets[ i ] ); // Установить приложение точкой подвески силу подвески колес
wheelsData.setTireForceAppPointOffset( i, tireForceAppCMOffsets[ i ] ); // Установить приложение точку шин силу шинах колес
}
//Diff
PxVehicleDifferential4WData diff;
diff.mType = PxVehicleDifferential4WData::eDIFF_TYPE_LS_4WD;
driveData.setDiffData( diff );
//Engine
PxVehicleEngineData engine;
engine.mPeakTorque = 300.f; // максимальная скорость вращения двигателя
engine.mMaxOmega = 400.f; // Максимальный крутящий момент доступен обратиться к двигателю
engine.mDampingRateFullThrottle = 0.15f; // скорость затухания двигатель при полностью открытой дроссельной заслонке
engine.mDampingRateZeroThrottleClutchEngaged = 8.f; // скорость затухания двигатель при нулевой газ при включении сцепления
engine.mDampingRateZeroThrottleClutchDisengaged = 0.35f; // Краткие скорость затухания двигатель при нулевой газ при выключенном сцеплении (на нейтральной передаче)
driveData.setEngineData( engine );
//Gears
PxVehicleGearsData gears;
gears.mSwitchTime = 0.5f;
driveData.setGearsData( gears );
// Прочность сцепления
PxVehicleClutchData clutch;
clutch.mStrength = PxVehicleGearsData::eMAX_NUM_GEAR_RATIOS;
driveData.setClutchData( clutch );
//Ackermann steer accuracy
PxVehicleAckermannGeometryData ackermann;
ackermann.mAccuracy = 0.1f;
ackermann.mAxleSeparation = wheelCentreOffsets[ 0 ].z - wheelCentreOffsets[ nWheels - 1 ].z; // Расстояние между центром передней оси и центром задней оси
ackermann.mFrontWidth = wheelCentreOffsets[ 0 ].x - wheelCentreOffsets[ 1 ].x; // Расстояние между центральной точке два передних колеса
ackermann.mRearWidth = wheelCentreOffsets[ nWheels - 2 ].x - wheelCentreOffsets[ nWheels - 1 ].x; // Расстояние между центральной точке два задних колеса
driveData.setAckermannGeometryData(ackermann);
PxTriangleMesh * pTriangleMesh = 0;
D3DXVECTOR3 vPosition;
if( GameObject * pRoller = GetDetail( WHEEL_LEFT_1ST ) )
{
if( pRoller->CreateTriangleMesh( pPhysX ) )
{
pRoller->Update( 0.f );
pTriangleMesh = pRoller->GetTriangleMesh();
Position = pRoller->GetPosition();
}
}
// Нам нужно добавить колеса столкновения форм, их местный позы, материал для колес, и моделирование фильтра для колес
PxTriangleMeshGeometry WheelGeom( pTriangleMesh );
PxGeometry* wheelGeometries[ nWheels ] = {0};
PxTransform wheelLocalPoses[ nWheels ];
for( PxU32 i = 0; i < nWheels; ++i )
{
wheelGeometries[ i ] = &WheelGeom;
wheelLocalPoses[ i ] = PxTransform::createIdentity();
}
PxMaterial* pMaterial = pPhysX->GetPhysics()->createMaterial( 0.5f, 0.5f, 0.1f ); //коэффициенты трения скольжения и покоя(Dynamic friction,Static friction), коэффициент упругости
const PxMaterial& wheelMaterial = *pMaterial;
PxFilterData wheelCollFilterData;
wheelCollFilterData.word0 = COLLISION_FLAG_WHEEL;
wheelCollFilterData.word1 = COLLISION_FLAG_WHEEL_AGAINST;
// Нам нужно добавить шасси столкновения форм, их местный позы, материала для шасси и моделирования фильтр для шасси.
//PxBoxGeometry chassisConvexGeom( 1.5f, 0.3f, 4.f );
PxBoxGeometry chassisConvexGeom( chassisDims.x/2, chassisDims.y/2, chassisDims.z/2 );
const PxGeometry* chassisGeoms = &chassisConvexGeom;
const PxTransform chassisLocalPoses = PxTransform::createIdentity();
const PxMaterial& chassisMaterial = *pMaterial;
PxFilterData chassisCollFilterData;
chassisCollFilterData.word0 = COLLISION_FLAG_CHASSIS;
chassisCollFilterData.word1 = COLLISION_FLAG_CHASSIS_AGAINST;
// Создание фильтра запроса данных для автомобилей, чтобы машины не пытайтесь ездить на себя.
PxFilterData vehQryFilterData;
SampleVehicleSetupVehicleShapeQueryFilterData( &vehQryFilterData );
PxRigidDynamic* vehActor = pPhysX->GetPhysics()->createRigidDynamic( PxTransform::createIdentity() );
//Add all the wheel shapes to the actor.
for( PxU32 i = 0; i < nWheels; ++i )
{
PxShape* wheelShape=vehActor->createShape( *wheelGeometries[ i ], wheelMaterial );
wheelShape->setQueryFilterData( vehQryFilterData );
wheelShape->setSimulationFilterData( wheelCollFilterData );
wheelShape->setLocalPose( wheelLocalPoses[ i ] );
wheelShape->setFlag( PxShapeFlag::eSIMULATION_SHAPE, true );
}
//Add the chassis shapes to the actor
PxShape* chassisShape = vehActor->createShape( *chassisGeoms, chassisMaterial );
chassisShape->setQueryFilterData( vehQryFilterData );
chassisShape->setSimulationFilterData( chassisCollFilterData );
chassisShape->setLocalPose( PxTransform( physx::PxVec3( 0, 0, 0 ) ) );
vehActor->setMass( chassisData.mMass );
vehActor->setMassSpaceInertiaTensor( chassisData.mMOI );
vehActor->setCMassLocalPose( PxTransform( chassisData.mCMOffset, PxQuat::createIdentity() ) );
vehActor->setGlobalPose( PxTransform( physx::PxVec3( 0, 8, 0 ), PxQuat::createIdentity() ) );
PxVehicleDriveTank* pTank = PxVehicleDriveTank::allocate( nWheels );
pTank->setup( pPhysX->GetPhysics(), vehActor, *wheelsSimData, driveData, nWheels );
pPhysX->AddActorScene( vehActor );
m_pActor = vehActor;
pPhysX->AddTank( pTank );
//Free the sim data because we don't need that any more.
wheelsSimData->free();
//pTank->setDriveModel( PxVehicleDriveTank::eDRIVE_MODEL_SPECIAL );
pTank->setToRestState();
pTank->mDriveDynData.setUseAutoGears( true );
return true;
}
}
return false;
}
void CreateVehicle4WSimulationData( PxConvexMesh* chassisConvexMesh, PxConvexMesh** wheelConvexMeshes,
const PxVec3* wheelCenterOffsets, PxVehicleWheelsSimData& wheelsData, PxVehicleDriveSimData4W& driveData,
PhysXVehicleInitData* generalData, PhysXVehicleInitData** wheelDatas )
{
float chassisMass = generalData->GetFloatParameter( "massChassis" );
PxF32 wheelWidths[ 4 ];
PxF32 wheelRadii[ 4 ];
ComputeWheelWidthsAndRadii( wheelConvexMeshes, wheelWidths, wheelRadii );
//Wheels
for( int n = 0; n < 4; n++ )
{
PhysXVehicleInitData* wheelInitData = wheelDatas[ n ];
PxVehicleWheelData wheelData;
wheelData.mRadius = wheelRadii[ n ];
wheelData.mMass = wheelInitData->GetFloatParameter( "mass" );
wheelData.mMOI = 0.5f * wheelData.mMass * wheelRadii[ n ] * wheelRadii[ n ];
wheelData.mWidth = wheelWidths[ n ];
wheelData.mDampingRate = wheelInitData->GetFloatParameter( "wheelDampingRate" );
wheelData.mMaxBrakeTorque = wheelInitData->GetFloatParameter( "wheelMaxBrakeTorque" );
wheelData.mMaxHandBrakeTorque = wheelInitData->GetFloatParameter( "wheelMaxHandBrakeTorque" );
wheelData.mMaxSteer = DegToRad( wheelInitData->GetFloatParameter("wheelMaxSteer") );
wheelData.mToeAngle = DegToRad( wheelInitData->GetFloatParameter("wheelToeAngle") );
wheelsData.setWheelData( n, wheelData );
PxVehicleTireData tireData;
tireData.mLatStiffX = wheelInitData->GetFloatParameter( "tireLatStiffX" );
tireData.mLatStiffY = wheelInitData->GetFloatParameter( "tireLatStiffY" );
tireData.mLongitudinalStiffnessPerUnitGravity = wheelInitData->GetFloatParameter( "tireLongitudinalStiffnessPerUnitGravity" );
tireData.mCamberStiffness = wheelInitData->GetFloatParameter( "tireCamberStiffness" );
tireData.mFrictionVsSlipGraph[ 0 ][ 1 ] = wheelInitData->GetFloatParameter( "frictionVsSlipGraphZeroLongitudinalSlip" );
tireData.mFrictionVsSlipGraph[ 1 ][ 0 ] = wheelInitData->GetFloatParameter( "frictionVsSlipGraphLongitudinalSlipWithMaximumFriction" );
tireData.mFrictionVsSlipGraph[ 1 ][ 1 ] = wheelInitData->GetFloatParameter( "frictionVsSlipGraphMaximumFriction" );
tireData.mFrictionVsSlipGraph[ 2 ][ 0 ] = wheelInitData->GetFloatParameter( "frictionVsSlipGraphEndPointOfGraph" );
tireData.mFrictionVsSlipGraph[ 2 ][ 1 ] = wheelInitData->GetFloatParameter( "frictionVsSlipGraphValueOfFrictionForSlipsGreaterThanEndPointOfGraph" );
wheelsData.setTireData( n, tireData );
PxVehicleSuspensionData suspensionData;
suspensionData.mMaxCompression = wheelInitData->GetFloatParameter( "suspensionMaxCompression" );
suspensionData.mMaxDroop = wheelInitData->GetFloatParameter( "suspensionMaxDroop" );
suspensionData.mSpringStrength = wheelInitData->GetFloatParameter( "suspensionSpringStrength" );
suspensionData.mSpringDamperRate = wheelInitData->GetFloatParameter( "suspensionSpringDamperRate" );
suspensionData.mSprungMass = chassisMass * wheelInitData->GetFloatParameter( "suspensionSprungMassCoefficient" );
wheelsData.setSuspensionData( n, suspensionData );
PxVec3 suspensionForceApplicationPointOffset = PxVec3(
wheelInitData->GetFloatParameter( "suspensionForceApplicationPointOffset.X" ),
wheelInitData->GetFloatParameter( "suspensionForceApplicationPointOffset.Y" ),
wheelInitData->GetFloatParameter( "suspensionForceApplicationPointOffset.Z" ) );
PxVec3 tireForceApplicationPointOffset = PxVec3(
wheelInitData->GetFloatParameter( "tireForceApplicationPointOffset.X" ),
wheelInitData->GetFloatParameter( "tireForceApplicationPointOffset.Y" ),
wheelInitData->GetFloatParameter( "tireForceApplicationPointOffset.Z" ) );
wheelsData.setSuspTravelDirection( n, PxVec3( 0, 0, -1 ) );
wheelsData.setWheelCentreOffset( n, wheelCenterOffsets[ n ] );
wheelsData.setSuspForceAppPointOffset( n, wheelCenterOffsets[ n ] + suspensionForceApplicationPointOffset );
wheelsData.setTireForceAppPointOffset( n, wheelCenterOffsets[ n ] + tireForceApplicationPointOffset );
}
//Differential
{
PxVehicleDifferential4WData differential;
differential.mType = (int)( generalData->GetFloatParameter( "differentialType" ) + .0001f );
differential.mFrontRearSplit = generalData->GetFloatParameter( "differentialFrontRearSplit" );
differential.mFrontLeftRightSplit = generalData->GetFloatParameter( "differentialFrontLeftRightSplit" );
differential.mRearLeftRightSplit = generalData->GetFloatParameter( "differentialRearLeftRightSplit" );
differential.mCentreBias = generalData->GetFloatParameter( "differentialCenterBias" );
differential.mFrontBias = generalData->GetFloatParameter( "differentialFrontBias" );
differential.mRearBias = generalData->GetFloatParameter( "differentialRearBias" );
driveData.setDiffData( differential );
}
//Engine
{
PxVehicleEngineData engine;
engine.mPeakTorque = generalData->GetFloatParameter("enginePeakTorque");// 500.0f;
engine.mMaxOmega = generalData->GetFloatParameter("engineMaxRPM") * PI * 2.0f / 60.0f;//600.0f;//approx 6000 rpm
engine.mDampingRateFullThrottle = generalData->GetFloatParameter("engineDampingRateFullThrottle");
engine.mDampingRateZeroThrottleClutchEngaged = generalData->GetFloatParameter("engineDampingRateZeroThrottleClutchEngaged");
engine.mDampingRateZeroThrottleClutchDisengaged = generalData->GetFloatParameter("engineDampingRateZeroThrottleClutchDisengaged");
PxFixedSizeLookupTable<PxVehicleEngineData::eMAX_NUM_ENGINE_TORQUE_CURVE_ENTRIES> torqueCurve;
for( int n = 0; n < PxVehicleEngineData::eMAX_NUM_ENGINE_TORQUE_CURVE_ENTRIES; n++ )
{
char s[50];
sprintf(s, "engineTorqueCurveTorque%d", n);
if(!generalData->IsFloatParameterExist(s))
break;
float torque = generalData->GetFloatParameter(s);
sprintf(s, "engineTorqueCurveRev%d", n);
float rev = generalData->GetFloatParameter(s);
torqueCurve.addPair(torque, rev);
}
engine.mTorqueCurve = torqueCurve;
driveData.setEngineData( engine );
}
//Gears
{
PxVehicleGearsData gears;
for( int n = 0; n < PxVehicleGearsData::eMAX_NUM_GEAR_RATIOS; n++)
gears.mRatios[ n ] = 0;
int minNumber = 100000;
int maxNumber = -100000;
for( int number = -1; number <= 30; number++ )
{
char s[25];
sprintf(s, "gear%d", number);
if(generalData->IsFloatParameterExist(s))
{
float ratio = generalData->GetFloatParameter(s);
gears.mRatios[ number + 1 ] = ratio;
if(number < minNumber)
minNumber = number;
if(number > maxNumber)
maxNumber = number;
}
}
gears.mFinalRatio = 1;
gears.mNumRatios = maxNumber - minNumber + 1;
gears.mSwitchTime = generalData->GetFloatParameter(L"gearsSwitchTime");//0.5f;
driveData.setGearsData(gears);
}
//Clutch
PxVehicleClutchData clutch;
clutch.mStrength = generalData->GetFloatParameter(L"clutchStrength");
driveData.setClutchData(clutch);
//Ackermann steer accuracy
PxVehicleAckermannGeometryData ackermann;
ackermann.mAccuracy = generalData->GetFloatParameter(L"ackermannSteerAccuracy");
ackermann.mAxleSeparation = fabs(
wheelCenterOffsets[PxVehicleDrive4W::eFRONT_LEFT_WHEEL].x -
wheelCenterOffsets[PxVehicleDrive4W::eREAR_LEFT_WHEEL].x);
ackermann.mFrontWidth = fabs(
wheelCenterOffsets[PxVehicleDrive4W::eFRONT_RIGHT_WHEEL].y -
wheelCenterOffsets[PxVehicleDrive4W::eFRONT_LEFT_WHEEL].y);
ackermann.mRearWidth = fabs(
wheelCenterOffsets[PxVehicleDrive4W::eREAR_LEFT_WHEEL].y -
wheelCenterOffsets[PxVehicleDrive4W::eREAR_RIGHT_WHEEL].y);
driveData.setAckermannGeometryData(ackermann);
}
void createVehicle4WSimulationData
(const PxF32 chassisMass, PxConvexMesh* chassisConvexMesh,
const PxF32 wheelMass, PxConvexMesh** wheelConvexMeshes, const PxVec3* wheelCentreOffsets,
PxVehicleWheelsSimData& wheelsData, PxVehicleDriveSimData4W& driveData, PxVehicleChassisData& chassisData)
{
//Extract the chassis AABB dimensions from the chassis convex mesh.
const PxVec3 chassisDims=computeChassisAABBDimensions(chassisConvexMesh);
//The origin is at the center of the chassis mesh.
//Set the center of mass to be below this point and a little towards the front.
const PxVec3 chassisCMOffset=PxVec3(0.0f,-chassisDims.y*0.5f+0.65f,0.25f);
//Now compute the chassis mass and moment of inertia.
//Use the moment of inertia of a cuboid as an approximate value for the chassis moi.
PxVec3 chassisMOI
((chassisDims.y*chassisDims.y + chassisDims.z*chassisDims.z)*chassisMass/12.0f,
(chassisDims.x*chassisDims.x + chassisDims.z*chassisDims.z)*chassisMass/12.0f,
(chassisDims.x*chassisDims.x + chassisDims.y*chassisDims.y)*chassisMass/12.0f);
//A bit of tweaking here. The car will have more responsive turning if we reduce the
//y-component of the chassis moment of inertia.
chassisMOI.y*=0.8f;
//Let's set up the chassis data structure now.
chassisData.mMass=chassisMass;
chassisData.mMOI=chassisMOI;
chassisData.mCMOffset=chassisCMOffset;
//Work out the front/rear mass split from the cm offset.
//This is a very approximate calculation with lots of assumptions.
//massRear*zRear + massFront*zFront = mass*cm (1)
//massRear + massFront = mass (2)
//Rearrange (2)
//massFront = mass - massRear (3)
//Substitute (3) into (1)
//massRear(zRear - zFront) + mass*zFront = mass*cm (4)
//Solve (4) for massRear
//massRear = mass(cm - zFront)/(zRear-zFront) (5)
//Now we also have
//zFront = (z-cm)/2 (6a)
//zRear = (-z-cm)/2 (6b)
//Substituting (6a-b) into (5) gives
//massRear = 0.5*mass*(z-3cm)/z (7)
const PxF32 massRear=0.5f*chassisMass*(chassisDims.z-3*chassisCMOffset.z)/chassisDims.z;
const PxF32 massFront=chassisMass-massRear;
//Extract the wheel radius and width from the wheel convex meshes.
PxF32 wheelWidths[4];
PxF32 wheelRadii[4];
computeWheelWidthsAndRadii(wheelConvexMeshes,wheelWidths,wheelRadii);
//Now compute the wheel masses and inertias components around the axle's axis.
//http://en.wikipedia.org/wiki/List_of_moments_of_inertia
PxF32 wheelMOIs[4];
for(PxU32 i=0;i<4;i++)
{
wheelMOIs[i]=0.5f*wheelMass*wheelRadii[i]*wheelRadii[i];
}
//Let's set up the wheel data structures now with radius, mass, and moi.
PxVehicleWheelData wheels[4];
for(PxU32 i=0;i<4;i++)
{
wheels[i].mRadius=wheelRadii[i];
wheels[i].mMass=wheelMass;
wheels[i].mMOI=wheelMOIs[i];
wheels[i].mWidth=wheelWidths[i];
}
//Disable the handbrake from the front wheels and enable for the rear wheels
wheels[PxVehicleDrive4W::eFRONT_LEFT_WHEEL].mMaxHandBrakeTorque=0.0f;
wheels[PxVehicleDrive4W::eFRONT_RIGHT_WHEEL].mMaxHandBrakeTorque=0.0f;
wheels[PxVehicleDrive4W::eREAR_LEFT_WHEEL].mMaxHandBrakeTorque=4000.0f;
wheels[PxVehicleDrive4W::eREAR_RIGHT_WHEEL].mMaxHandBrakeTorque=4000.0f;
//Enable steering for the front wheels and disable for the front wheels.
wheels[PxVehicleDrive4W::eFRONT_LEFT_WHEEL].mMaxSteer=PxPi*0.3333f;
wheels[PxVehicleDrive4W::eFRONT_RIGHT_WHEEL].mMaxSteer=PxPi*0.3333f;
wheels[PxVehicleDrive4W::eREAR_LEFT_WHEEL].mMaxSteer=0.0f;
wheels[PxVehicleDrive4W::eREAR_RIGHT_WHEEL].mMaxSteer=0.0f;
//Let's set up the tire data structures now.
//Put slicks on the front tires and wets on the rear tires.
PxVehicleTireData tires[4];
tires[PxVehicleDrive4W::eFRONT_LEFT_WHEEL].mType=TIRE_TYPE_SLICKS;
tires[PxVehicleDrive4W::eFRONT_RIGHT_WHEEL].mType=TIRE_TYPE_SLICKS;
tires[PxVehicleDrive4W::eREAR_LEFT_WHEEL].mType=TIRE_TYPE_WETS;
tires[PxVehicleDrive4W::eREAR_RIGHT_WHEEL].mType=TIRE_TYPE_WETS;
//Let's set up the suspension data structures now.
PxVehicleSuspensionData susps[4];
for(PxU32 i=0;i<4;i++)
{
susps[i].mMaxCompression=0.3f;
susps[i].mMaxDroop=0.1f;
susps[i].mSpringStrength=35000.0f;
susps[i].mSpringDamperRate=4500.0f;
}
susps[PxVehicleDrive4W::eFRONT_LEFT_WHEEL].mSprungMass=massFront*0.5f;
susps[PxVehicleDrive4W::eFRONT_RIGHT_WHEEL].mSprungMass=massFront*0.5f;
susps[PxVehicleDrive4W::eREAR_LEFT_WHEEL].mSprungMass=massRear*0.5f;
susps[PxVehicleDrive4W::eREAR_RIGHT_WHEEL].mSprungMass=massRear*0.5f;
//We need to set up geometry data for the suspension, wheels, and tires.
//We already know the wheel centers described as offsets from the rigid body centre of mass.
//From here we can approximate application points for the tire and suspension forces.
//Lets assume that the suspension travel directions are absolutely vertical.
//Also assume that we apply the tire and suspension forces 30cm below the centre of mass.
PxVec3 suspTravelDirections[4]={PxVec3(0,-1,0),PxVec3(0,-1,0),PxVec3(0,-1,0),PxVec3(0,-1,0)};
PxVec3 wheelCentreCMOffsets[4];
PxVec3 suspForceAppCMOffsets[4];
PxVec3 tireForceAppCMOffsets[4];
for(PxU32 i=0;i<4;i++)
{
wheelCentreCMOffsets[i]=wheelCentreOffsets[i]-chassisCMOffset;
suspForceAppCMOffsets[i]=PxVec3(wheelCentreCMOffsets[i].x,-0.3f,wheelCentreCMOffsets[i].z);
tireForceAppCMOffsets[i]=PxVec3(wheelCentreCMOffsets[i].x,-0.3f,wheelCentreCMOffsets[i].z);
}
//Now add the wheel, tire and suspension data.
for(PxU32 i=0;i<4;i++)
{
wheelsData.setWheelData(i,wheels[i]);
wheelsData.setTireData(i,tires[i]);
wheelsData.setSuspensionData(i,susps[i]);
wheelsData.setSuspTravelDirection(i,suspTravelDirections[i]);
wheelsData.setWheelCentreOffset(i,wheelCentreCMOffsets[i]);
wheelsData.setSuspForceAppPointOffset(i,suspForceAppCMOffsets[i]);
wheelsData.setTireForceAppPointOffset(i,tireForceAppCMOffsets[i]);
}
//Now set up the differential, engine, gears, clutch, and ackermann steering.
//Diff
PxVehicleDifferential4WData diff;
diff.mType=PxVehicleDifferential4WData::eDIFF_TYPE_LS_4WD;
driveData.setDiffData(diff);
//Engine
PxVehicleEngineData engine;
engine.mPeakTorque=500.0f;
engine.mMaxOmega=600.0f;//approx 6000 rpm
driveData.setEngineData(engine);
//Gears
PxVehicleGearsData gears;
gears.mSwitchTime=0.5f;
driveData.setGearsData(gears);
//Clutch
PxVehicleClutchData clutch;
clutch.mStrength=10.0f;
driveData.setClutchData(clutch);
//Ackermann steer accuracy
PxVehicleAckermannGeometryData ackermann;
ackermann.mAccuracy=1.0f;
ackermann.mAxleSeparation=wheelCentreOffsets[PxVehicleDrive4W::eFRONT_LEFT_WHEEL].z-wheelCentreOffsets[PxVehicleDrive4W::eREAR_LEFT_WHEEL].z;
ackermann.mFrontWidth=wheelCentreOffsets[PxVehicleDrive4W::eFRONT_RIGHT_WHEEL].x-wheelCentreOffsets[PxVehicleDrive4W::eFRONT_LEFT_WHEEL].x;
ackermann.mRearWidth=wheelCentreOffsets[PxVehicleDrive4W::eREAR_RIGHT_WHEEL].x-wheelCentreOffsets[PxVehicleDrive4W::eREAR_LEFT_WHEEL].x;
driveData.setAckermannGeometryData(ackermann);
}