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    #226
    Hi guys, I need some help with an airplane.

    It is based on ONSPlaneCraft:

    My Current Def. Properties (related to movement/flying) are:

     
    Spoiler


    My problems are:
    The plane flies very unrealistically.
    I need to move the mouse many times like crazy in order to bank the airplane.
    I need to bank almost 90 degrees to get a chance to steer.
    The steering is very slow....

    If anyone has made an unrealistically flying airplane, please share your experience. Thx!
    Last edited by Deggenyr; 09-23-2019, 11:00 AM.

    Comment

      #227
      Hey Deggenyr. Karma physics Planes are kind of tough. AirPower used the fake planecode/projectiles as I recall (similar to the SpaceFighters) to get their flying working, which is nice, but didn't use karma physics. I tried getting a couple of modified planes working, but most maps weren't large enough to use them, and I lost interest in working on them

      Here is some code I was using to try and implement both flying, and taxi-ing on the run way. I converted the C++ plane flying code into UnrealScript so that I could change the behavior (see the various checks for bOnGround). I print the plane's forward speed on the screen and use the chargebar to indicate thrust as a percentage of MaxThrust. The plane must reach 2000 uus forward speed (what the MinAirSpeed and kMaxSpeed variables are set to) before you can pull back on the mouse to get the plane off the ground. Because of the relative slow speed, I should probably adjust the drag factors a bit and lift calculations since I lose lift pretty fast when I bank this vehicle to turn it. I did get the mouse to bank it a lot faster though....
      Code:
      class TDJetTest extends ONSBomber;

/*
  So, what I've done here is to try and create a more forgiving (e.g. poorly
  implemented and unrealistic, but hopefully fun) model for flight that restricts
  the player from turning too sharply based on their forward velocity.  They can
  then turn as much as I allow without really having to worry about losing lift, BUT
  if they hit a wall they will explode, and they can't do any cool aerobatic tricks
  like stalling & pitching over, or the "fighter jet wheelie"

  What I want:
  -Strafe:
      >on the ground turns the Jet, or rather applies a force at the front wheel
       in the lateral direction
      >in the air applies slight banking turn with roughly constant "tightness" that eases in-out
  -Rotation Pitch:
      >on the ground only affect camera... transitions into controlling nose pitch
       after take off
      >in the air control the nose pitch
  -Rotation Yaw:
      >on the ground only affect camera... transitions into controlling nose pitch
       after take off
      >in the air control the roll angle

The "lift" feature seems problematic.... or at least harder to understand/troubleshoot
so instead lets screw with the KActorGravScale variable so that we change it from 2.0
while on the ground to 0.0 while flying at some full speed...

*/

var     vector  UCForce, UCTorque;
var     float TDBCurrentThrust;
var()   InterpCurve   LiftSpeedGravCurve; // Input is forward speed as % of max, output is Kgravity scale


var byte TestByteA, TestByteB;

var float MinAirSpeed, MaxAirSpeed;
var float MaxBrakeDampening;
var float SavePitchTorque;
var float SaveBankTorque;

var string SdebugRotDelta, SdebugThrottleStr, SdebugKafStr, SdebugTorqueStr;


// Calculate forces for thrust/turning etc. and apply them.
simulated event UpdateVehicle(float DeltaTime){
    local vector Up, Force, Torque, DirX, DirY, DirZ, Forward, Right, Lift, Thrust,
                 Drag, RelativeWindVelocity, LateralVelocity, NormalizedVelocity,
                 CurPitchTorque, PitchDampening, CurBankTorque, BankDampening,
                 BrakingForce, TaxiTorque;
    local float AngleOfAttack, RelativeWindFactor, NewGravScale, Speed,
                PitchTorqueScale, BankTorqueScale, TaxiTorqueScale;
    local int i, ViewOffsetPitch, ViewOffsetYaw;
    local rotator ViewOffset;
    local bool bOnGround;
    //local KRigidBodyState rbState;
    local KarmaParams KP;

    // Dont go adding forces if vehicle is asleep.
    if( !KIsAwake() )
        return;

    //KGetRigidBodyState(rbState); // danger, this function loads and overwrites
    KP = KarmaParams(KParams);
    if(KP == none)
        return;
    //TestByteA++;
    // Calc up (z), right(y) and forward (x) vectors
    GetAxes(Rotation, DirX, DirY, DirZ);

    // 'World plane' forward & right vectors ie. no z component.
    Forward = DirX;
    Forward.Z = 0.0f;
    Forward=Normal(Forward);

    Right = DirY;
    Right.Z = 0.0f;
    Right=Normal(Right);

    Up=vect(0,0,1);

    // Get body angular velocity (JTODO: Add AngularVelocity to Actor!)

//////////////////////////////////////////////////////////////////////////////////////////////

    if (Controller!=none){
        // FIXME? below, test if the native code may have already wiped this out by resetting to zero
        ViewOffsetPitch = Controller.Rotation.Pitch & 65535;
        ViewOffsetYaw = Controller.Rotation.Yaw & 65535;
        SdebugThrottleStr = "ControllerRotation: Pitch"@Controller.Rotation.Pitch@", Yaw: "@Controller.Rotation.Yaw;

        if (ViewOffsetPitch > 32768)
            ViewOffsetPitch -= 65535;

        if (ViewOffsetYaw > 32768)
            ViewOffsetYaw -= 65535;

        // Reset Controller Rotation
        Controller.SetRotation(Rot(0,0,0)); // <-FIXME? the native code may have already wiped this out

        //bOnGround = true;
        for(i=0; i<KP.Repulsors.Length; i++){
            if( KP.Repulsors[i] != None && KP.Repulsors[i].bRepulsorInContact )
                bOnGround = true;
        }

        // THRUST //
        //TestByteB++;
        if (OutputThrust > 0)
        //SdebugThrottleStr = "Throttle: "@Throttle@", OutputThrust: "@OutputThrust@", PlaneState->ServerThrust:"@PlaneState.ServerThrust;
            TDBCurrentThrust = FMin(TDBCurrentThrust + (ThrustAcceleration * DeltaTime), MaxThrust);
        else if (OutputThrust < 0) // only decrease thrust if we are actively trying to slow it down
            TDBCurrentThrust = FMax(TDBCurrentThrust - (ThrustAcceleration * DeltaTime), 0.0);
        //else
        //    TDBCurrentThrust = FMax(TDBCurrentThrust - (ThrustAcceleration * DeltaTime), 0.0);

        Thrust = TDBCurrentThrust * DirX;

        // RELATIVE WIND //
        LateralVelocity = (Velocity dot DirY) * DirY;
        RelativeWindVelocity = -(Velocity - LateralVelocity); // Remove the Y component of the velocity and take the inverse
        RelativeWindFactor = AirFactor * VSize(RelativeWindVelocity) * VSize(RelativeWindVelocity);

        // ANGLE OF ATTACK //
        AngleOfAttack = Acos(FClamp((DirX dot -RelativeWindVelocity) / VSize(RelativeWindVelocity), -1.0, 1.0));
        AngleOfAttack = (AngleOfAttack / 3.14159f) * 360.0f;
        if ((DirZ dot -RelativeWindVelocity) > 0)
            AngleOfAttack *= -1;

        // LIFT //
        Lift = DirZ * InterpCurveEval(LiftCoefficientCurve, AngleOfAttack) * RelativeWindFactor; // <- this assumes a certain airspeed to overcome gravity

        // "fake lift", really just turning off gravity..
        Speed = Velocity dot DirX;
        NewGravScale = InterpCurveEval(LiftSpeedGravCurve, Speed/MinAirSpeed);
        SdebugThrottleStr = SdebugThrottleStr @ ", GRAVSCALE: "@NewGravScale;
       // KSetActorGravScale(NewGravScale); // <- this works OK, but not great, and seem to be

        // DRAG //
        NormalizedVelocity = Normal(Velocity);
        Drag = InterpCurveEval(DragCoefficientCurve, AngleOfAttack) * RelativeWindFactor * -NormalizedVelocity;

        // BRAKING when taxiing
        if(bOnGround && OutputRise < 0){
            // add some sort of drag?
            BrakingForce = MaxBrakeDampening * Forward * Speed;
        }

        // ADD FORCES AND APPLY
        Force = Thrust + Lift + Drag - LateralVelocity * 0.2 - BrakingForce;


        ////////////
        // TORQUE //
        ////////////
        ViewOffset.Pitch = ViewOffsetPitch;
        ViewOffset.Yaw = -ViewOffsetYaw;
        ViewOffset.Roll = 0;


        // Pitching Torque
        PitchTorqueScale = Abs(float(ViewOffset.Pitch) / 4096.0);
        if (ViewOffset.Pitch > 0){
            CurPitchTorque = PitchTorque * FMin(VSize(RelativeWindVelocity)/ MinAirSpeed, 1.0) * PitchTorqueScale * DirY;// MinAirSpeed used to be 3000 in this line
            SavePitchTorque = VSize(CurPitchTorque); // DEBUG
        }else{
            CurPitchTorque = PitchTorque * FMin(VSize(RelativeWindVelocity)/ MinAirSpeed, 1.0) * PitchTorqueScale * -DirY;// MinAirSpeed used to be 3000 in this line
            SavePitchTorque = -1*VSize(CurPitchTorque); // DEBUG
        }
        //// Pitch Dampening
        //PitchDampening = -CurPitchTorque * AngleOfAttack / 90.0;

        // Banking Torque
        BankTorqueScale = Abs(float(ViewOffset.Yaw) / 4096.0);
        if (ViewOffset.Yaw > 0){
            CurBankTorque = BankTorque * FMin(VSize(RelativeWindVelocity) / MinAirSpeed, 1.0) * BankTorqueScale * DirX;// MinAirSpeed used to be 3000 in this line
            SaveBankTorque = VSize(CurBankTorque); // DEBUG
        }else{
            CurBankTorque = BankTorque * FMin(VSize(RelativeWindVelocity) / MinAirSpeed, 1.0) * BankTorqueScale * -DirX;// MinAirSpeed used to be 3000 in this line
            SaveBankTorque = -1*VSize(CurBankTorque); // DEBUG
        }
        //// Bank Dampening
        //BankDampening = -CurBankTorque * AngleOfAttack / 90.0;

        //StrafeTorque = (200 * -OutputStrafe * OnGroundTorqueScale) * Up;
        if(bOnGround && OutputStrafe != 0){
            //Speed = VSize(Velocity);
            TaxiTorqueScale = 1;// InterpCurveEval(HoverForceCurve, Speed) / 700;
            TaxiTorque = (200 * -OutputStrafe * TaxiTorqueScale) * vect(0,0,1);
        }
        SdebugTorqueStr="TORQUE: Pitch"@SavePitchTorque@", Roll: "@SaveBankTorque;
        Torque = CurPitchTorque + PitchDampening + CurBankTorque + BankDampening + TaxiTorque;

        // Apply force/torque to body.
        //debugf(TEXT("BankTorqueScale: %f   ViewOffset.Yaw: %f"), BankTorqueScale, ViewOffset.Yaw);

    }
    //KAddForces(Force, Torque); // this can't be called from UScript
    UCForce = Force;
    UCTorque = Torque;
}


simulated function DisplayDebug(Canvas Canvas, out float YL, out float YPos){
    Super.DisplayDebug(Canvas, YL, YPos);
    Canvas.SetDrawColor(255,0,0);
    Canvas.DrawText("TDBThrust = "@TDBCurrentThrust@", TestbyteA "@TestByteA @", TestbyteB "@ TestByteB);
    YPos += YL;
    Canvas.DrawText(SdebugThrottleStr);
    YPos += YL;
    Canvas.DrawText(SdebugTorqueStr);
    YPos += YL;
    //Canvas.DrawText(SdebugKafStr);
    //YPos += YL;
}

simulated function float ChargeBar()
{
    return TDBCurrentThrust/MaxThrust;
}

simulated function KApplyForce(out vector Force, out vector Torque){
    //local float OnGroundTorqueScale, Speed;
    Super.KApplyForce(Force, Torque);
    Force = UCForce;
    Torque = UCTorque;

    // Try to add some turning force while on the ground, THIS WORKS PRETTY WELL!
    //Speed = VSize(Velocity);
    //OnGroundTorqueScale = InterpCurveEval(HoverForceCurve, Speed) / 700;
    //Torque += (200 * -OutputStrafe * OnGroundTorqueScale) * vect(0,0,1);

    // now zero them out so they don't persist to the next tick
    UCForce = vect(0,0,0);
    UCTorque = vect(0,0,0);
    //SdebugKafStr =" -- Kaf Force: "@Force@", Torque"@Torque;
}

// try to fix the first person view, to actually view in FP
simulated function SpecialCalcFirstPersonView(PlayerController PC, out actor ViewActor, out vector CameraLocation, out rotator CameraRotation )
{
   local vector CamLookAt;//, HitLocation, HitNormal;
   local float LerpAmount;
   local float CurTime;

   ViewActor = self;

   CurTime = Level.TimeSeconds;
   LerpAmount = 1.0 - ( CameraSwingRatio ** (CurTime - LastCamTime) );
   LastCamTime = CurTime;
      CamLookAt = Location;
      CameraRotation.Roll = Rotation.roll;
      CameraRotation.Yaw = LastCamRot.Yaw + GetRotDiff(Rotation.Yaw, LastCamRot.Yaw) * LerpAmount;
      CameraRotation.Pitch = Rotation.pitch;

    CameraLocation = CamLookAt + (FPCamPos >> Rotation);
   LastCamRot = CameraRotation;
}


simulated function DrawHUD(Canvas Canvas)
{
    local float ScaleX, ScaleY;
    local float DirXSpeed;

    super.DrawHUD(Canvas);
    // Draw some bars near the center that represent the forces being applied for
    // pitch and roll, and forward speed
    if (IsLocallyControlled())
    {
        DirXSpeed = Velocity dot vector(Rotation);
        Canvas.Font = Canvas.MedFont;
        ScaleX = Canvas.clipX/1024;
        ScaleY = Canvas.clipY/768;
        Canvas.SetDrawColor (20, 255, 20 ,255);
        Canvas.DrawColor.A = 255;
        Canvas.Style = ERenderStyle.STY_Alpha;
        Canvas.DrawTextJustified("Fwd Speed:"@DirXSpeed, 1, Canvas.clipX/2, Canvas.clipY/2 , Canvas.ClipX/2 + ScaleX*150, Canvas.clipY/2 + ScaleY*15);
        // No Torque Bar code yet...
        //SavePitchTorque =;
        //SaveBankTorque =;
     }
}


defaultproperties
{
    bShowChargingBar=true // for displaying the thrust!

    VehiclePositionString="in a TD Harrier Jet"
    VehicleNameString="TD Harrier Jet"

    Mesh=Mesh'Harrier_mesh_v4'
    RedSkin=material'MiG35Skin_shad'
    BlueSkin=material'MiG35Skin_shad'
    skins(1)=material'BHawkInteriorSkin'
    DriverWeapons(0)=(WeaponClass=class'JetMiG35_PilotGun',WeaponBone=tip_R);

    Health=2000
    HealthMax=2000
    CollisionHeight=+120.0
    CollisionRadius=380.0

    IdleSound=sound'ONSVehicleSounds-S.Flying.Flying02'
    MaxPitchSpeed=3200
    SoundVolume=255

    Begin Object Class=KarmaParamsRBFull Name=KParamsHarrier
        KInertiaTensor(0)=3.5
        KInertiaTensor(1)=0.0
        KInertiaTensor(2)=0.0
        KInertiaTensor(3)=10
        KInertiaTensor(4)=0.0
        KInertiaTensor(5)=13
        KCOMOffset=(X=0.65,Y=0.0,Z=0.0)
        KStartEnabled=True
        KFriction=0.6
        KLinearDamping=0.0
        KAngularDamping=1.5
        bKNonSphericalInertia=True
        bHighDetailOnly=False
        bClientOnly=False
        bKDoubleTickRate=True
        KActorGravScale=2.0
        KMaxSpeed=2000//2500.0//4000.0
        KImpactThreshold=300
        bDestroyOnWorldPenetrate=True
        bDoSafetime=True
        Name="KParamsHarrier"
    End Object
    KParams=KarmaParams'KParamsHarrier'

    DrawScale=1.0

    //VehicleMass=4

    //bDrawDriverInTP=False
    //bDrawMeshInFP=True
    //TPCamDistance=500
    //TPCamLookAt=(X=0.0,Y=0.0,Z=0)
    //TPCamWorldOffset=(X=0,Y=0,Z=200)
    FPCamPos=(X=260,Y=0.0,Z=60.0)
    //TPCamDistance=500
    //TPCamLookAt=(X=0.0,Y=0.0,Z=0)
    //TPCamWorldOffset=(X=0,Y=0,Z=200)
    DrivePos=(X=260.0,Y=0.0,Z=60.0)
    EntryPosition=(X=250.0,Y=0.0,Z=0.0)
    EntryRadius=100.0

    LiftSpeedGravCurve=(Points=((InVal=0.0,OutVal=2.0),(InVal=0.3,OutVal=1.3),(InVal=0.6,OutVal=0.8),(InVal=0.75,OutVal=0.5),(InVal=0.85,OutVal=0.2),(InVal=1.0,OutVal=0.0),(InVal=4.0,OutVal=0.0)))
    MinAirSpeed=2000//2500
    MaxAirSpeed=3500
    MaxBrakeDampening=0.25

    LiftCoefficientCurve=(Points=((InVal=-180,OutVal=0.0),(InVal=-10.0,OutVal=0.0),(InVal=0.0,OutVal=0.4),(InVal=6.0,OutVal=0.8),(InVal=10.0,OutVal=1.2),(InVal=12.0,OutVal=1.4),(InVal=20.0,OutVal=0.8),(InVal=60.0,OutVal=0.6),(InVal=90.0,OutVal=0.0),(InVal=180.0,OutVal=0.0)))
    DragCoefficientCurve=(Points=((InVal=-180,OutVal=0.0),(InVal=-90.0,OutVal=1.2),(InVal=-10.0,OutVal=0.1),(InVal=-5.0,OutVal=0.35),(InVal=0.0,OutVal=0.01),(InVal=5.0,OutVal=0.35),(InVal=10.0,OutVal=0.1),(InVal=15.0,OutVal=0.3),(InVal=60.0,OutVal=1.0),(InVal=90.0,OutVal=1.2),(InVal=180.0,OutVal=0.0)))
    AirFactor=0.00010//<- good for 2000uu airspeed, good for 4000uu airspeed-> 0.00005

    HoverForceCurve=(Points=((InVal=0,OutVal=500),(InVal=30,OutVal=700),(InVal=250,OutVal=0)))
    COMHeight=20.0
    MaxThrust=110.0
    PitchTorque=700.0
    BankTorque=700.0
    ThrustAcceleration=60.0
    bHoverOnGround=True

    //ImpactDamageThreshold=1000
    ImpactDamageMult=0.01

    MomentumMult=0.05

    HoverSoftness=0.05//0.9
    HoverPenScale=1.5
    HoverCheckDist=85

    ThrusterOffsets(0)=(X=176,Y=0,Z=10)
    ThrusterOffsets(1)=(X=-112,Y=180,Z=10)
    ThrusterOffsets(2)=(X=-112,Y=-180,Z=10)
    ThrusterOffsets(3)=(X=-176,Y=0,Z=10)

    ExitPositions(0)=(X=0,Y=500,Z=100)
    ExitPositions(1)=(X=0,Y=-500,Z=100)
    ExitPositions(2)=(X=350,Y=0,Z=100)
    ExitPositions(3)=(X=-350,Y=0,Z=100)

    //bZeroPCRotOnEntry=true
    bEjectDriver=true
    bEjectPassengersWhenFlipped=false
    bCanBeBaseForPawns=true
}
      Last edited by meowcatbuf; 10-14-2019, 10:55 AM.

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