459 lines
18 KiB
C#
459 lines
18 KiB
C#
using UnityEngine;
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#if ENABLE_INPUT_SYSTEM
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using UnityEngine.InputSystem;
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#endif
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namespace RaceFields.Vehicles
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{
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[RequireComponent(typeof(Rigidbody))]
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public sealed class ArcadeBuggyController : MonoBehaviour
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{
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[Header("Wheel Colliders")]
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[SerializeField] private WheelCollider frontLeftCollider;
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[SerializeField] private WheelCollider frontRightCollider;
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[SerializeField] private WheelCollider rearLeftCollider;
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[SerializeField] private WheelCollider rearRightCollider;
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[Header("Wheel Visuals")]
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[SerializeField] private Transform frontLeftVisual;
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[SerializeField] private Transform frontRightVisual;
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[SerializeField] private Transform rearLeftVisual;
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[SerializeField] private Transform rearRightVisual;
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[Header("Driving")]
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[SerializeField, Range(20f, 190f)] private float maxSpeedKmh = 120f;
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[SerializeField, Range(10f, 120f)] private float maxReverseSpeedKmh = 45f;
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[SerializeField, Range(1f, 10f)] private float accelerationMultiplier = 6f;
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[SerializeField, Range(10f, 45f)] private float maxSteerAngle = 35f;
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[SerializeField, Range(0.1f, 1f)] private float steeringSpeed = 0.5f;
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[SerializeField, Range(100f, 600f)] private float brakeForce = 450f;
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[SerializeField, Range(1f, 10f)] private float decelerationMultiplier = 2f;
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[SerializeField, Range(1f, 10f)] private float handbrakeDriftMultiplier = 5f;
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[SerializeField] private float downforce = 35f;
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[Header("Stability")]
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[SerializeField] private Vector3 centerOfMass = new Vector3(0f, -0.45f, 0.15f);
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[Header("Effects")]
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[SerializeField] private bool useEffects = true;
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[SerializeField] private ParticleSystem rearLeftSmoke;
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[SerializeField] private ParticleSystem rearRightSmoke;
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[SerializeField] private TrailRenderer rearLeftSkid;
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[SerializeField] private TrailRenderer rearRightSkid;
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[Header("Sounds")]
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[SerializeField] private bool useSounds;
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[SerializeField] private AudioSource engineSound;
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[SerializeField] private AudioSource tireScreechSound;
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public float SpeedKmh { get; private set; }
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public bool IsDrifting { get; private set; }
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public bool IsTractionLocked { get; private set; }
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private const float TorquePerAccelerationStep = 50f;
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private const float DriftVelocityThreshold = 2.5f;
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private const float SkidVelocityThreshold = 5f;
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private const float EffectsMinSpeedKmh = 12f;
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private Rigidbody body;
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private float throttleInput;
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private float steeringInput;
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private bool handbrakeInput;
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private float steeringAxis;
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private float throttleAxis;
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private float driftingAxis;
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private float localVelocityX;
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private float localVelocityZ;
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private float initialEnginePitch;
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private WheelFrictionCurve frontLeftSidewaysFriction;
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private WheelFrictionCurve frontRightSidewaysFriction;
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private WheelFrictionCurve rearLeftSidewaysFriction;
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private WheelFrictionCurve rearRightSidewaysFriction;
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private float frontLeftExtremumSlip;
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private float frontRightExtremumSlip;
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private float rearLeftExtremumSlip;
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private float rearRightExtremumSlip;
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private Quaternion frontLeftVisualRotationOffset = Quaternion.identity;
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private Quaternion frontRightVisualRotationOffset = Quaternion.identity;
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private Quaternion rearLeftVisualRotationOffset = Quaternion.identity;
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private Quaternion rearRightVisualRotationOffset = Quaternion.identity;
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private void Awake()
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{
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body = GetComponent<Rigidbody>();
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AutoFindReferences();
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CacheVisualRotationOffsets();
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CacheWheelFriction();
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body.centerOfMass = centerOfMass;
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initialEnginePitch = engineSound != null ? engineSound.pitch : 1f;
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SetEffectsActive(false);
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}
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private void Update()
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{
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ReadInput();
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UpdateTelemetry();
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UpdateWheelVisuals();
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UpdateSounds();
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}
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private void FixedUpdate()
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{
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ApplySteering();
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ApplyDrive();
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ApplyHandbrake();
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ApplyDownforce();
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UpdateEffects();
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}
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private void ReadInput()
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{
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#if ENABLE_INPUT_SYSTEM
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if (Keyboard.current != null)
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{
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float forward = Keyboard.current.wKey.isPressed || Keyboard.current.upArrowKey.isPressed ? 1f : 0f;
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float reverse = Keyboard.current.sKey.isPressed || Keyboard.current.downArrowKey.isPressed ? 1f : 0f;
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float left = Keyboard.current.aKey.isPressed || Keyboard.current.leftArrowKey.isPressed ? 1f : 0f;
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float right = Keyboard.current.dKey.isPressed || Keyboard.current.rightArrowKey.isPressed ? 1f : 0f;
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throttleInput = forward - reverse;
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steeringInput = right - left;
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handbrakeInput = Keyboard.current.spaceKey.isPressed;
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return;
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}
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#endif
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throttleInput = Input.GetAxisRaw("Vertical");
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steeringInput = Input.GetAxisRaw("Horizontal");
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handbrakeInput = Input.GetKey(KeyCode.Space);
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}
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private void UpdateTelemetry()
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{
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SpeedKmh = body.linearVelocity.magnitude * 3.6f;
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Vector3 localVelocity = transform.InverseTransformDirection(body.linearVelocity);
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localVelocityX = localVelocity.x;
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localVelocityZ = localVelocity.z;
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IsDrifting = Mathf.Abs(localVelocityX) > DriftVelocityThreshold;
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}
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private void ApplySteering()
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{
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if (steeringInput < -0.01f)
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steeringAxis -= Time.fixedDeltaTime * 10f * steeringSpeed;
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else if (steeringInput > 0.01f)
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steeringAxis += Time.fixedDeltaTime * 10f * steeringSpeed;
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else
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steeringAxis = Mathf.MoveTowards(steeringAxis, 0f, Time.fixedDeltaTime * 10f * steeringSpeed);
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steeringAxis = Mathf.Clamp(steeringAxis, -1f, 1f);
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float steeringAngle = steeringAxis * maxSteerAngle;
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SetSteerAngle(frontLeftCollider, steeringAngle, steeringSpeed);
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SetSteerAngle(frontRightCollider, steeringAngle, steeringSpeed);
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}
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private void ApplyDrive()
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{
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if (throttleInput > 0.01f)
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{
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throttleAxis = Mathf.MoveTowards(throttleAxis, 1f, Time.fixedDeltaTime * 3f);
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if (localVelocityZ < -1f)
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{
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ApplyBrakeTorque(brakeForce);
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ApplyMotorTorque(0f);
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return;
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}
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ApplyBrakeTorque(0f);
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ApplyMotorTorque(SpeedKmh < maxSpeedKmh ? accelerationMultiplier * TorquePerAccelerationStep * throttleAxis : 0f);
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return;
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}
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if (throttleInput < -0.01f)
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{
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throttleAxis = Mathf.MoveTowards(throttleAxis, -1f, Time.fixedDeltaTime * 3f);
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if (localVelocityZ > 1f)
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{
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ApplyBrakeTorque(brakeForce);
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ApplyMotorTorque(0f);
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return;
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}
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ApplyBrakeTorque(0f);
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ApplyMotorTorque(SpeedKmh < maxReverseSpeedKmh ? accelerationMultiplier * TorquePerAccelerationStep * throttleAxis : 0f);
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return;
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}
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throttleAxis = Mathf.MoveTowards(throttleAxis, 0f, Time.fixedDeltaTime * 10f);
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ApplyMotorTorque(0f);
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if (!handbrakeInput)
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{
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ApplyBrakeTorque(0f);
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body.linearVelocity *= 1f / (1f + 0.025f * decelerationMultiplier);
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if (body.linearVelocity.magnitude < 0.25f)
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body.linearVelocity = Vector3.zero;
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}
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}
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private void ApplyHandbrake()
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{
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if (handbrakeInput)
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{
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driftingAxis = Mathf.Clamp01(driftingAxis + Time.fixedDeltaTime);
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float startingPoint = driftingAxis * frontLeftExtremumSlip * handbrakeDriftMultiplier;
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if (startingPoint < frontLeftExtremumSlip)
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driftingAxis = frontLeftExtremumSlip / (frontLeftExtremumSlip * handbrakeDriftMultiplier);
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SetDriftFriction(driftingAxis);
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IsTractionLocked = true;
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ApplyBrakeTorque(brakeForce);
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return;
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}
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IsTractionLocked = false;
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driftingAxis = Mathf.MoveTowards(driftingAxis, 0f, Time.fixedDeltaTime / 1.5f);
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SetDriftFriction(driftingAxis);
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}
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private void ApplyDownforce()
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{
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body.AddForce(-transform.up * downforce * body.linearVelocity.magnitude, ForceMode.Force);
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}
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private void UpdateSounds()
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{
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if (!useSounds)
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{
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StopAudio(engineSound);
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StopAudio(tireScreechSound);
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return;
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}
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if (engineSound != null)
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{
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if (!engineSound.isPlaying)
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engineSound.Play();
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engineSound.pitch = initialEnginePitch + body.linearVelocity.magnitude / 25f;
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}
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bool rearWheelsGrounded = IsWheelGrounded(rearLeftCollider) || IsWheelGrounded(rearRightCollider);
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bool shouldScreech = rearWheelsGrounded && (IsDrifting || (IsTractionLocked && SpeedKmh > EffectsMinSpeedKmh));
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if (tireScreechSound != null)
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{
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if (shouldScreech && !tireScreechSound.isPlaying)
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tireScreechSound.Play();
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else if (!shouldScreech && tireScreechSound.isPlaying)
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tireScreechSound.Stop();
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}
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}
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private void UpdateEffects()
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{
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if (!useEffects)
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{
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SetEffectsActive(false);
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return;
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}
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bool rearLeftGrounded = IsWheelGrounded(rearLeftCollider);
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bool rearRightGrounded = IsWheelGrounded(rearRightCollider);
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bool emitSmoke = IsDrifting && SpeedKmh > EffectsMinSpeedKmh;
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bool emitSkids = (IsTractionLocked || Mathf.Abs(localVelocityX) > SkidVelocityThreshold) && SpeedKmh > EffectsMinSpeedKmh;
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SetParticlePlaying(rearLeftSmoke, emitSmoke && rearLeftGrounded);
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SetParticlePlaying(rearRightSmoke, emitSmoke && rearRightGrounded);
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SetTrailEmitting(rearLeftSkid, emitSkids && rearLeftGrounded);
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SetTrailEmitting(rearRightSkid, emitSkids && rearRightGrounded);
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}
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private void UpdateWheelVisuals()
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{
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SyncWheelVisual(frontLeftCollider, frontLeftVisual, frontLeftVisualRotationOffset);
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SyncWheelVisual(frontRightCollider, frontRightVisual, frontRightVisualRotationOffset);
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SyncWheelVisual(rearLeftCollider, rearLeftVisual, rearLeftVisualRotationOffset);
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SyncWheelVisual(rearRightCollider, rearRightVisual, rearRightVisualRotationOffset);
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}
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private void CacheWheelFriction()
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{
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frontLeftSidewaysFriction = frontLeftCollider != null ? frontLeftCollider.sidewaysFriction : default;
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frontRightSidewaysFriction = frontRightCollider != null ? frontRightCollider.sidewaysFriction : default;
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rearLeftSidewaysFriction = rearLeftCollider != null ? rearLeftCollider.sidewaysFriction : default;
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rearRightSidewaysFriction = rearRightCollider != null ? rearRightCollider.sidewaysFriction : default;
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frontLeftExtremumSlip = frontLeftSidewaysFriction.extremumSlip;
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frontRightExtremumSlip = frontRightSidewaysFriction.extremumSlip;
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rearLeftExtremumSlip = rearLeftSidewaysFriction.extremumSlip;
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rearRightExtremumSlip = rearRightSidewaysFriction.extremumSlip;
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}
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private void SetDriftFriction(float drift)
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{
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ApplySidewaysFriction(frontLeftCollider, ref frontLeftSidewaysFriction, frontLeftExtremumSlip, drift);
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ApplySidewaysFriction(frontRightCollider, ref frontRightSidewaysFriction, frontRightExtremumSlip, drift);
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ApplySidewaysFriction(rearLeftCollider, ref rearLeftSidewaysFriction, rearLeftExtremumSlip, drift);
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ApplySidewaysFriction(rearRightCollider, ref rearRightSidewaysFriction, rearRightExtremumSlip, drift);
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}
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private void ApplySidewaysFriction(WheelCollider wheel, ref WheelFrictionCurve friction, float defaultExtremumSlip, float drift)
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{
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if (wheel == null)
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return;
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float driftExtremumSlip = defaultExtremumSlip * handbrakeDriftMultiplier;
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friction.extremumSlip = Mathf.Lerp(defaultExtremumSlip, driftExtremumSlip, drift);
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wheel.sidewaysFriction = friction;
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}
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private void ApplyMotorTorque(float torque)
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{
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SetDriveTorque(frontLeftCollider, torque);
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SetDriveTorque(frontRightCollider, torque);
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SetDriveTorque(rearLeftCollider, torque);
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SetDriveTorque(rearRightCollider, torque);
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}
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private void ApplyBrakeTorque(float torque)
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{
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SetBrakeTorque(frontLeftCollider, torque);
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SetBrakeTorque(frontRightCollider, torque);
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SetBrakeTorque(rearLeftCollider, torque);
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SetBrakeTorque(rearRightCollider, torque);
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}
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private static void SetSteerAngle(WheelCollider wheel, float angle, float lerp)
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{
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if (wheel != null)
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wheel.steerAngle = Mathf.Lerp(wheel.steerAngle, angle, lerp);
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}
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private static void SetDriveTorque(WheelCollider wheel, float torque)
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{
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if (wheel != null)
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wheel.motorTorque = torque;
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}
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private static void SetBrakeTorque(WheelCollider wheel, float torque)
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{
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if (wheel != null)
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wheel.brakeTorque = torque;
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}
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private static void SyncWheelVisual(WheelCollider collider, Transform visual, Quaternion visualRotationOffset)
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{
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if (collider == null || visual == null)
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return;
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collider.GetWorldPose(out Vector3 position, out Quaternion rotation);
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visual.SetPositionAndRotation(position, rotation * visualRotationOffset);
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}
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private void SetEffectsActive(bool active)
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{
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SetParticlePlaying(rearLeftSmoke, active);
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SetParticlePlaying(rearRightSmoke, active);
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SetTrailEmitting(rearLeftSkid, active);
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SetTrailEmitting(rearRightSkid, active);
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}
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private static void SetParticlePlaying(ParticleSystem particles, bool playing)
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{
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if (particles == null)
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return;
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if (playing && !particles.isPlaying)
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particles.Play();
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else if (!playing && particles.isPlaying)
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particles.Stop();
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}
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private static void SetTrailEmitting(TrailRenderer trail, bool emitting)
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{
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if (trail != null)
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trail.emitting = emitting;
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}
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private static bool IsWheelGrounded(WheelCollider wheel)
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{
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return wheel != null && wheel.isGrounded;
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}
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private static void StopAudio(AudioSource source)
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{
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if (source != null && source.isPlaying)
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source.Stop();
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}
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private void AutoFindReferences()
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{
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frontLeftCollider ??= FindChildComponent<WheelCollider>("WheelCollider_FL");
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frontRightCollider ??= FindChildComponent<WheelCollider>("WheelCollider_FR");
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rearLeftCollider ??= FindChildComponent<WheelCollider>("WheelCollider_RL");
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rearRightCollider ??= FindChildComponent<WheelCollider>("WheelCollider_RR");
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frontLeftVisual ??= FindFirstChildTransform("F_L", "WheelVisual_FL");
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frontRightVisual ??= FindFirstChildTransform("F_R", "WheelVisual_FR");
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rearLeftVisual ??= FindFirstChildTransform("B_L", "WheelVisual_RL");
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rearRightVisual ??= FindFirstChildTransform("B_R", "WheelVisual_RR");
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rearLeftSmoke ??= FindChildComponent<ParticleSystem>("LeftTireSmoke_PS");
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rearRightSmoke ??= FindChildComponent<ParticleSystem>("RightTireSmoke_PS");
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rearLeftSkid ??= FindChildComponent<TrailRenderer>("LeftTireSkid");
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rearRightSkid ??= FindChildComponent<TrailRenderer>("RightTireSkid");
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}
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private void CacheVisualRotationOffsets()
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{
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frontLeftVisualRotationOffset = GetVisualRotationOffset(frontLeftCollider, frontLeftVisual);
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frontRightVisualRotationOffset = GetVisualRotationOffset(frontRightCollider, frontRightVisual);
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rearLeftVisualRotationOffset = GetVisualRotationOffset(rearLeftCollider, rearLeftVisual);
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rearRightVisualRotationOffset = GetVisualRotationOffset(rearRightCollider, rearRightVisual);
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}
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private static Quaternion GetVisualRotationOffset(WheelCollider collider, Transform visual)
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{
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if (collider == null || visual == null)
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return Quaternion.identity;
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return Quaternion.Inverse(collider.transform.rotation) * visual.rotation;
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}
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private T FindChildComponent<T>(string childName) where T : Component
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{
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Transform child = FindChildTransform(childName);
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return child != null ? child.GetComponent<T>() : null;
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}
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private Transform FindChildTransform(string childName)
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{
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Transform[] children = GetComponentsInChildren<Transform>(true);
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for (int i = 0; i < children.Length; i++)
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{
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if (children[i].name == childName)
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return children[i];
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}
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return null;
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}
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private Transform FindFirstChildTransform(params string[] childNames)
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{
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for (int i = 0; i < childNames.Length; i++)
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{
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Transform child = FindChildTransform(childNames[i]);
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if (child != null)
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return child;
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}
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return null;
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}
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}
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}
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