[SOLVED] Need help dealing with vehicle clipping

Unity Engine
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1

Hello, I am new here so I apologies for any mistakes. I have been making a monster truck game but keep having collision issues, the truck simply clips through objects and I haven’t been able to find any solutions I tried using rigidbody methods but then the truck no longer moves or moves uncontrollably fast I am completely lost…

here’s the code:

using UnityEngine;

public class VehicleControl: MonoBehaviour
{
    public float moveSpeed = 10f;           // Max speed
    public float turnSpeed = 5f;            // Turning speed
    public float acceleration = 5f;         // Acceleration speed
    public float deceleration = 5f;         // deceleration speed
    public float brakeForce = 20f;          // Brake power
    private float currentSpeed = 0f;        // current speed 
    private Rigidbody rb;

    private void Start()
    {
        rb = GetComponent<Rigidbody>();
    }

    private void FixedUpdate()
    {
        HandleMovement();
        HandleSteering();
    }

    private void HandleMovement()
    {
        float moveInput = Input.GetAxis("Vertical");

        // Acceleration
        if (moveInput > 0)
        {
            currentSpeed += moveInput * acceleration * Time.fixedDeltaTime;
        }
        // Deceleration (let off the gas)
        else if (moveInput == 0 && currentSpeed > 0)
        {
            currentSpeed -= deceleration * Time.fixedDeltaTime;
        }
        // Braking (moving backwards or pressing down on the brake)
        else if (moveInput < 0)
        {
            currentSpeed -= brakeForce * -moveInput * Time.fixedDeltaTime;
        }

        // Clamp the current speed to avoid exceeding max speed or going negative
        currentSpeed = Mathf.Clamp(currentSpeed, 0f, moveSpeed);

        // Apply the movement based on the current speed
        Vector3 move = transform.forward * currentSpeed * Time.fixedDeltaTime;
        rb.MovePosition(rb.position + move);
    }

    private void HandleSteering()
    {
        float turnInput = Input.GetAxis("Horizontal");

        // Only allow turning if the car is moving forward or backward
        if (currentSpeed > 0)
        {
            Quaternion turn = Quaternion.Euler(0f, turnInput * turnSpeed, 0f);
            rb.MoveRotation(rb.rotation * turn);
        }
    }
}
2

When using 3D physics MovePosition and MoveRotation don’t respond to collisions very well as the methods are really meant to be used with kinematic rigidbodies. Instead you’ll need to use AddForce and AddTorque to move and rotate the truck. Although a better solution might be to use wheel colliders and motorTorque etc.

3

Exactly this ^ ^ ^

And here’s a cool tutorial for it:

4

That’s a very nice video!. It’s also how I do rigidbody character controllers. Instead of sliding them along the ground and having them bump up against steps etc, I found it’s best to make them hover with a little bounce/suspension. It also makes it easy to add a crouch ability.