Fix player jitter on moving platforms

Assets/Content/Scripts/JetPack.cs

@@ -0,0 +1,129 @@
+using Unity.VisualScripting;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+public class JetPack : MonoBehaviour
+{
+    [System.Serializable]
+    public class Settings
+    {
+        public float Force = 5;
+        public float Duration = 10;
+    }
+
+    [System.Serializable]
+    public class References
+    {
+        public BoxCollider Collider;
+        public SphereCollider Trigger;
+        public Rigidbody Rigidbody;
+        public ParticleSystem Particles;
+        public InputActionAsset InputActions;
+    }
+
+    [System.Serializable]
+    public class StateContainer
+    {
+        public bool Equiped;
+    }
+
+    [SerializeField]
+    public Settings _settings;
+
+    [SerializeField]
+    public References _references;
+
+    [SerializeField]
+    public StateContainer _state;
+
+    private bool _wasPressed;
+    private float _duration = 0;
+    private float _smooth = 0;
+
+    private InputAction _jumpAction;
+
+    void OnTriggerEnter(Collider col)
+    {
+        if (Player.Instance && Player.Instance.gameObject == col.gameObject)
+        {
+            Equip();
+        }
+    }
+
+    void Awake()
+    {
+        _duration = _settings.Duration;
+        _jumpAction = _references.InputActions.FindActionMap("Player").FindAction("Jump");
+    }
+
+    void Update()
+    {
+        if (_state.Equiped && Player.Instance)
+        {
+            if (_duration > 0)
+            {
+                if (_jumpAction.IsPressed())
+                {
+                    _wasPressed = true;
+                    _duration -= Time.deltaTime;
+                    _smooth = Mathf.Clamp01(_smooth + Time.deltaTime);
+                    //Player.Instance.SetExtraForce(Vector3.up * _settings.Force * _smooth, true);
+                }
+                else if (_wasPressed)
+                {
+                    _smooth = 0;
+                    _wasPressed = false;
+                    ResetExtraForce();
+                }
+            }
+            else
+            {
+                Unequip();
+            }
+        }
+    }
+
+    private void Equip()
+    {
+        if (_state.Equiped || _duration <= 0 ||!Player.Instance)
+            return;
+
+        _wasPressed = false;
+        _state.Equiped = true;
+        _duration = _settings.Duration;
+
+        _references.Collider.enabled = false;
+        _references.Trigger.enabled = false;
+        _references.Rigidbody.isKinematic = true;
+
+        transform.parent = Player.Instance.transform.GetChild(0).GetChild(1).GetChild(0);
+        transform.localPosition = new Vector3(0, .3f, -.4f);
+        transform.localEulerAngles = Vector3.zero;
+    }
+
+    private void Unequip()
+    {
+        if (!_state.Equiped)
+            return;
+
+        ResetExtraForce();
+
+        _state.Equiped = false;
+        _duration = _settings.Duration;
+
+        transform.parent = null;
+
+        Vector3 random = new Vector3(UnityEngine.Random.Range(-1, 1), UnityEngine.Random.Range(-1, 1), UnityEngine.Random.Range(-1, 1)).normalized;
+
+        _references.Collider.enabled = true;
+        _references.Trigger.enabled = false;
+        _references.Rigidbody.isKinematic = false;
+        _references.Rigidbody.AddRelativeTorque(random, ForceMode.Impulse);
+    }
+
+
+    private void ResetExtraForce()
+    {
+        //Player.Instance.SetExtraForce(Vector3.zero, false);
+    }
+}