AE86-3DS/Assets/Ash Assets/Arcade Vehicle Physics/Scripts/ArcadeVehicleController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace ArcadeVP
{
    public class ArcadeVehicleController : MonoBehaviour
    {
        public enum groundCheck { rayCast, sphereCaste };
        public enum MovementMode { Velocity, AngularVelocity };
        public MovementMode movementMode;
        public groundCheck GroundCheck;
        public LayerMask drivableSurface;
        
        [Range(0f, 1f)]
        [Tooltip("Force du freinage classique (0 = aucun effet, 1 = arrêt immédiat)")]
        public float brakePower = 0.3f;
        public float MaxSpeed, accelaration, turn, gravity = 7f, downforce = 5f;
        [Tooltip("if true : can turn vehicle in air")]
        public bool AirControl = false;
        [Tooltip("if true : vehicle will drift instead of brake while holding space")]
        public bool kartLike = false;
        [Tooltip("turn more while drifting (while holding space) only if kart Like is true")]
        public float driftMultiplier = 1.5f;

        public Rigidbody rb, carBody;

        [HideInInspector]
        public RaycastHit hit;
        public AnimationCurve frictionCurve;
        public AnimationCurve turnCurve;
        public PhysicsMaterial frictionMaterial;
        [Header("Visuals")]
        public Transform BodyMesh;
        public Transform[] FrontWheels = new Transform[2];
        public Transform[] RearWheels = new Transform[2];
        [HideInInspector]
        public Vector3 carVelocity;

        [Range(0, 10)]
        public float BodyTilt;
        [Header("Audio settings")]
        public AudioSource engineSound;
        [Range(0, 1)]
        public float minPitch;
        [Range(1, 3)]
        public float MaxPitch;
        public AudioSource SkidSound;

        [HideInInspector]
        public float skidWidth;


        private float radius, steeringInput, accelerationInput, handbrakeInput, brakeInput;
        private Vector3 origin;

        private void Start()
        {
            radius = rb.GetComponent<SphereCollider>().radius;
            if (movementMode == MovementMode.AngularVelocity)
            {
                Physics.defaultMaxAngularSpeed = 100;
            }
        }

        private void Update()
        {
            Visuals();
            AudioManager();
        }

        public void ProvideInputs(float _steeringInput, float _accelarationInput, float _handbrakeInput, float _brakeInput)
        {
            steeringInput = _steeringInput;
            accelerationInput = _accelarationInput;
            handbrakeInput = _handbrakeInput;
            brakeInput = _brakeInput;
        }

        public void AudioManager()
        {
            engineSound.pitch = Mathf.Lerp(minPitch, MaxPitch, Mathf.Abs(carVelocity.z) / MaxSpeed);
            if (Mathf.Abs(carVelocity.x) > 10 && grounded())
            {
                SkidSound.mute = false;
            }
            else
            {
                SkidSound.mute = true;
            }
        }


        void FixedUpdate()
        {
            carVelocity = carBody.transform.InverseTransformDirection(carBody.linearVelocity);

            if (Mathf.Abs(carVelocity.x) > 0)
            {
                //changes friction according to sideways speed of car
                frictionMaterial.dynamicFriction = frictionCurve.Evaluate(Mathf.Abs(carVelocity.x / 100));
            }


            if (grounded())
            {
                //turnlogic
                float sign = Mathf.Sign(carVelocity.z);
                float TurnMultiplyer = turnCurve.Evaluate(carVelocity.magnitude / MaxSpeed);
                if (kartLike && handbrakeInput > 0.1f) { TurnMultiplyer *= driftMultiplier; } //turn more if drifting


                if (accelerationInput > 0.1f || carVelocity.z > 1)
                {
                    carBody.AddTorque(Vector3.up * steeringInput * sign * turn * 100 * TurnMultiplyer);
                }
                else if (accelerationInput < -0.1f || carVelocity.z < -1)
                {
                    carBody.AddTorque(Vector3.up * steeringInput * sign * turn * 100 * TurnMultiplyer);
                }



                // mormal handbrakelogic
                if (!kartLike)
                {
                    if (handbrakeInput > 0.1f)
                    {
                        rb.constraints = RigidbodyConstraints.FreezeRotationX;
                    }
                    else
                    {
                        rb.constraints = RigidbodyConstraints.None;
                    }
                }

                //accelaration logic

                if (movementMode == MovementMode.AngularVelocity)
                {
                    HandleAngularAcceleration();
                }
                else if (movementMode == MovementMode.Velocity)
                {
                    HandleLinearAcceleration();
                }

                // if (movementMode == MovementMode.AngularVelocity)
                // {
                //     if (Mathf.Abs(accelerationInput) > 0.1f && handbrakeInput < 0.1f && !kartLike)
                //     {
                //         rb.angularVelocity = Vector3.Lerp(rb.angularVelocity, carBody.transform.right * accelerationInput * MaxSpeed / radius, accelaration * Time.deltaTime);
                //     }
                //     else if (Mathf.Abs(accelerationInput) > 0.1f && kartLike)
                //     {
                //         rb.angularVelocity = Vector3.Lerp(rb.angularVelocity, carBody.transform.right * accelerationInput * MaxSpeed / radius, accelaration * Time.deltaTime);
                //     }
                // }
                // else if (movementMode == MovementMode.Velocity)
                // {
                //     if (Mathf.Abs(accelerationInput) > 0.1f && handbrakeInput < 0.1f && !kartLike)
                //     {
                //         rb.linearVelocity = Vector3.Lerp(rb.linearVelocity, carBody.transform.forward * accelerationInput * MaxSpeed, accelaration / 10 * Time.deltaTime);
                //     }
                //     else if (Mathf.Abs(accelerationInput) > 0.1f && kartLike)
                //     {
                //         rb.linearVelocity = Vector3.Lerp(rb.linearVelocity, carBody.transform.forward * accelerationInput * MaxSpeed, accelaration / 10 * Time.deltaTime);
                //     }
                // }

                // down froce
                rb.AddForce(-transform.up * downforce * rb.mass);

                //body tilt
                carBody.MoveRotation(Quaternion.Slerp(carBody.rotation, Quaternion.FromToRotation(carBody.transform.up, hit.normal) * carBody.transform.rotation, 0.12f));
            }
            else
            {
                if (AirControl)
                {
                    //turnlogic
                    float TurnMultiplyer = turnCurve.Evaluate(carVelocity.magnitude / MaxSpeed);

                    carBody.AddTorque(Vector3.up * steeringInput * turn * 100 * TurnMultiplyer);
                }

                carBody.MoveRotation(Quaternion.Slerp(carBody.rotation, Quaternion.FromToRotation(carBody.transform.up, Vector3.up) * carBody.transform.rotation, 0.02f));
                rb.linearVelocity = Vector3.Lerp(rb.linearVelocity, rb.linearVelocity + Vector3.down * gravity, Time.deltaTime * gravity);
            }

        }

        private void HandleAngularAcceleration()
        {
            if (brakeInput > 0.1f)
            {
                rb.angularVelocity *= (1f - brakeInput * 0.3f);
                return;
            }

            if (Mathf.Abs(accelerationInput) > 0.1f && handbrakeInput < 0.1 && !kartLike)
            {
                rb.angularVelocity = Vector3.Lerp(rb.angularVelocity,
                    carBody.transform.right * accelerationInput * MaxSpeed / radius,
                    accelaration * Time.deltaTime);
            }
            else if (Mathf.Abs(accelerationInput) > 0.1f && kartLike)
            {
                rb.angularVelocity = Vector3.Lerp(rb.angularVelocity,
                    carBody.transform.right * accelerationInput * MaxSpeed / radius,
                    accelaration * Time.deltaTime);
            }
        }

        private void HandleLinearAcceleration()
        {
            // Frein classique : réduit progressivement avec courbe d'amortissement
            if (brakeInput > 0.1f)
            {
                // Frein exponentiel : plus on enfonce, plus c'est agressif
                float brakeFactor = 1f - Mathf.Pow(brakeInput, 1.5f) * brakePower;
                rb.linearVelocity *= brakeFactor;
        
                // Arrêt complet en dessous d'une certaine vitesse
                if (rb.linearVelocity.magnitude < 0.5f)
                {
                    rb.linearVelocity = Vector3.zero;
                }
                return;
            }

            // Accélération normale (sans frein)
            if (Mathf.Abs(accelerationInput) > 0.1f && handbrakeInput < 0.1f && !kartLike)
            {
                rb.linearVelocity = Vector3.Lerp(rb.linearVelocity, 
                    carBody.transform.forward * accelerationInput * MaxSpeed, 
                    accelaration / 10 * Time.deltaTime);
            }
            else if (Mathf.Abs(accelerationInput) > 0.1f && kartLike)
            {
                rb.linearVelocity = Vector3.Lerp(rb.linearVelocity, 
                    carBody.transform.forward * accelerationInput * MaxSpeed, 
                    accelaration / 10 * Time.deltaTime);
            }
        }
        
        public void Visuals()
        {
            //tires
            foreach (Transform FW in FrontWheels)
            {
                FW.localRotation = Quaternion.Slerp(FW.localRotation, Quaternion.Euler(FW.localRotation.eulerAngles.x,
                                   30 * steeringInput, FW.localRotation.eulerAngles.z), 0.7f * Time.deltaTime / Time.fixedDeltaTime);
                FW.GetChild(0).localRotation = rb.transform.localRotation;
            }
            RearWheels[0].localRotation = rb.transform.localRotation;
            RearWheels[1].localRotation = rb.transform.localRotation;

            //Body
            if (carVelocity.z > 1)
            {
                BodyMesh.localRotation = Quaternion.Slerp(BodyMesh.localRotation, Quaternion.Euler(Mathf.Lerp(0, -5, carVelocity.z / MaxSpeed),
                                   BodyMesh.localRotation.eulerAngles.y, BodyTilt * steeringInput), 0.4f * Time.deltaTime / Time.fixedDeltaTime);
            }
            else
            {
                BodyMesh.localRotation = Quaternion.Slerp(BodyMesh.localRotation, Quaternion.Euler(0, 0, 0), 0.4f * Time.deltaTime / Time.fixedDeltaTime);
            }


            if (kartLike)
            {
                if (handbrakeInput > 0.1f)
                {
                    BodyMesh.parent.localRotation = Quaternion.Slerp(BodyMesh.parent.localRotation,
                    Quaternion.Euler(0, 45 * steeringInput * Mathf.Sign(carVelocity.z), 0),
                    0.1f * Time.deltaTime / Time.fixedDeltaTime);
                }
                else
                {
                    BodyMesh.parent.localRotation = Quaternion.Slerp(BodyMesh.parent.localRotation,
                    Quaternion.Euler(0, 0, 0),
                    0.1f * Time.deltaTime / Time.fixedDeltaTime);
                }

            }

        }

        public bool grounded() //checks for if vehicle is grounded or not
        {
            origin = rb.position + rb.GetComponent<SphereCollider>().radius * Vector3.up;
            var direction = -transform.up;
            var maxdistance = rb.GetComponent<SphereCollider>().radius + 0.2f;

            if (GroundCheck == groundCheck.rayCast)
            {
                if (Physics.Raycast(rb.position, Vector3.down, out hit, maxdistance, drivableSurface))
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }

            else if (GroundCheck == groundCheck.sphereCaste)
            {
                if (Physics.SphereCast(origin, radius + 0.1f, direction, out hit, maxdistance, drivableSurface))
                {
                    return true;

                }
                else
                {
                    return false;
                }
            }
            else { return false; }
        }

        private void OnDrawGizmos()
        {
            //debug gizmos
            radius = rb.GetComponent<SphereCollider>().radius;
            float width = 0.02f;
            if (!Application.isPlaying)
            {
                Gizmos.color = Color.yellow;
                Gizmos.DrawWireCube(rb.transform.position + ((radius + width) * Vector3.down), new Vector3(2 * radius, 2 * width, 4 * radius));
                if (GetComponent<BoxCollider>())
                {
                    Gizmos.color = Color.green;
                    Gizmos.DrawWireCube(transform.position, GetComponent<BoxCollider>().size);
                }

            }

        }

    }
}