Hover vehicle spinning in circles when going upside down

Hi all,

Firstly, thank you for the help.

I'm creating a game using the Hover Racer Training vehicle movement script as a base. I've pasted the content below.

The issue I'm running into is that when my track goes upside down, as soon as my ship goes upside down, it spins out of controls and then consistently spins in what seems like a consistent circle.

Looking through the script (and a number of posts that are relatively similar), I'm at a loss at what to do next.

If anyone could take a look and suggest a solution I'd very much appreciated it.

Vehiclemovement script

//This script handles all of the physics behaviors for the player's ship. The primary functions
//are handling the hovering and thrust calculations.

using UnityEngine;

public class VehicleMovement : MonoBehaviour
{
public float speed; //The current forward speed of the ship

[Header("Drive Settings")]
public float driveForce = 17f; //The force that the engine generates
public float slowingVelFactor = .99f; //The percentage of velocity the ship maintains when not thrusting (e.g., a value of .99 means the ship loses 1% velocity when not thrusting)
public float brakingVelFactor = .95f; //The percentage of velocty the ship maintains when braking
public float angleOfRoll = 30f; //The angle that the ship "banks" into a turn

[Header("Hover Settings")]
public float hoverHeight = 1.5f; //The height the ship maintains when hovering
public float maxGroundDist = 5f; //The distance the ship can be above the ground before it is "falling"
public float hoverForce = 300f; //The force of the ship's hovering
public LayerMask whatIsGround; //A layer mask to determine what layer the ground is on
public PIDController hoverPID; //A PID controller to smooth the ship's hovering

[Header("Physics Settings")]
public Transform shipBody; //A reference to the ship's body, this is for cosmetics
public float terminalVelocity = 100f; //The max speed the ship can go
public float hoverGravity = 20f; //The gravity applied to the ship while it is on the ground
public float fallGravity = 80f; //The gravity applied to the ship while it is falling

Rigidbody rigidBody; //A reference to the ship's rigidbody
PlayerInput input; //A reference to the player's input
float drag; //The air resistance the ship recieves in the forward direction
bool isOnGround; //A flag determining if the ship is currently on the ground


void Start()
{
//Get references to the Rigidbody and PlayerInput components
rigidBody = GetComponent<Rigidbody>();
input = GetComponent<PlayerInput>();

//Calculate the ship's drag value
drag = driveForce / terminalVelocity;
}

void FixedUpdate()
{
//Calculate the current speed by using the dot product. This tells us
//how much of the ship's velocity is in the "forward" direction
speed = Vector3.Dot(rigidBody.velocity, transform.forward);

//Calculate the forces to be applied to the ship
CalculatHover();
CalculatePropulsion();
}

void CalculatHover()
{
//This variable will hold the "normal" of the ground. Think of it as a line
//the points "up" from the surface of the ground
Vector3 groundNormal;

//Calculate a ray that points straight down from the ship
Ray ray = new Ray(transform.position, -transform.up);

//Declare a variable that will hold the result of a raycast
RaycastHit hitInfo;

//Determine if the ship is on the ground by Raycasting down and seeing if it hits
//any collider on the whatIsGround layer
isOnGround = Physics.Raycast(ray, out hitInfo, maxGroundDist, whatIsGround);

//If the ship is on the ground...
if (isOnGround)
{
//...determine how high off the ground it is...
float height = hitInfo.distance;
//...save the normal of the ground...
groundNormal = hitInfo.normal.normalized;
//...use the PID controller to determine the amount of hover force needed...
float forcePercent = hoverPID.Seek(hoverHeight, height);

//...calulcate the total amount of hover force based on normal (or "up") of the ground...
Vector3 force = groundNormal * hoverForce * forcePercent;
//...calculate the force and direction of gravity to adhere the ship to the
//track (which is not always straight down in the world)...
Vector3 gravity = -groundNormal * hoverGravity * height;

//...and finally apply the hover and gravity forces
rigidBody.AddForce(force, ForceMode.Acceleration);
rigidBody.AddForce(gravity, ForceMode.Acceleration);
}
//...Otherwise...
else
{
//...use Up to represent the "ground normal". This will cause our ship to
//self-right itself in a case where it flips over
groundNormal = Vector3.up;

//Calculate and apply the stronger falling gravity straight down on the ship
Vector3 gravity = -groundNormal * fallGravity;
rigidBody.AddForce(gravity, ForceMode.Acceleration);
}

//Calculate the amount of pitch and roll the ship needs to match its orientation
//with that of the ground. This is done by creating a projection and then calculating
//the rotation needed to face that projection
Vector3 projection = Vector3.ProjectOnPlane(transform.forward, groundNormal);
Quaternion rotation = Quaternion.LookRotation(projection, groundNormal);

//Move the ship over time to match the desired rotation to match the ground. This is
//done smoothly (using Lerp) to make it feel more realistic
rigidBody.MoveRotation(Quaternion.Lerp(rigidBody.rotation, rotation, Time.deltaTime * 10f));

//Calculate the angle we want the ship's body to bank into a turn based on the current rudder.
//It is worth noting that these next few steps are completetly optional and are cosmetic.
//It just feels so darn cool
float angle = angleOfRoll * -input.rudder;

//Calculate the rotation needed for this new angle
Quaternion bodyRotation = transform.rotation * Quaternion.Euler(0f, 0f, angle);
//Finally, apply this angle to the ship's body
shipBody.rotation = Quaternion.Lerp(shipBody.rotation, bodyRotation, Time.deltaTime * 10f);
}

void CalculatePropulsion()
{
//Calculate the yaw torque based on the rudder and current angular velocity
float rotationTorque = input.rudder - rigidBody.angularVelocity.y;
//Apply the torque to the ship's Y axis
rigidBody.AddRelativeTorque(0f, rotationTorque, 0f, ForceMode.VelocityChange);

//Calculate the current sideways speed by using the dot product. This tells us
//how much of the ship's velocity is in the "right" or "left" direction
float sidewaysSpeed = Vector3.Dot(rigidBody.velocity, transform.right);

//Calculate the desired amount of friction to apply to the side of the vehicle. This
//is what keeps the ship from drifting into the walls during turns. If you want to add
//drifting to the game, divide Time.fixedDeltaTime by some amount
Vector3 sideFriction = -transform.right * (sidewaysSpeed / Time.fixedDeltaTime);

//Finally, apply the sideways friction
rigidBody.AddForce(sideFriction, ForceMode.Acceleration);

//If not propelling the ship, slow the ships velocity
if (input.thruster <= 0f)
rigidBody.velocity *= slowingVelFactor;

//Braking or driving requires being on the ground, so if the ship
//isn't on the ground, exit this method
if (!isOnGround)
return;

//If the ship is braking, apply the braking velocty reduction
if (input.isBraking)
rigidBody.velocity *= brakingVelFactor;

//Calculate and apply the amount of propulsion force by multiplying the drive force
//by the amount of applied thruster and subtracting the drag amount
float propulsion = driveForce * input.thruster - drag * Mathf.Clamp(speed, 0f, terminalVelocity);
rigidBody.AddForce(transform.forward * propulsion, ForceMode.Acceleration);
}

void OnCollisionStay(Collision collision)
{
//If the ship has collided with an object on the Wall layer...
if (collision.gameObject.layer == LayerMask.NameToLayer("Wall"))
{
//...calculate how much upward impulse is generated and then push the vehicle down by that amount
//to keep it stuck on the track (instead up popping up over the wall)
Vector3 upwardForceFromCollision = Vector3.Dot(collision.impulse, transform.up) * transform.up;
rigidBody.AddForce(-upwardForceFromCollision, ForceMode.Impulse);
}
}

public float GetSpeedPercentage()
{
//Returns the total percentage of speed the ship is traveling
return rigidBody.velocity.magnitude / terminalVelocity;
}
}

 

I'm having the same problem with the same question...my racing track has twisted loops, and accentuated high peaks, etc....The solution that I found for this is increase the angular drag to 30...but.....when I do that, the hover vehicle doesnt turns on Y-axis smoothly....Can U try if this method works to U....

 

I tried to found videos about this issue, and no success...

 

Hi, were you ever able to fix this problem? If Yes, could you please tell me how? Thank you

 

I'm trying to do this, as well.

 

Hi Guys, I found the fix to this. Add this line of code into "HandleHover()"

 

Hey!
Sorry to bother you, I tried adding that and I am still having the same problem did you change anything else?
I have my angular drag set to 3.
Are you using URP?
also which unity version are you using?
I am assuming we might have different Physics settings in the editor > project settings > physics