[Unity]Input & Controller Notes

Keywords: Unity, Input, Controller

Quick Start

1, Select Player Object.

2, Add Player Input Component.

3, Create default actions.

when Save window pop up, choose directory for saving.

4, Open Input Action Asset.

Now you would see default actions.

5, Check Generate C# Class in Inspector panel of Input Action Asset, then click Apply.

Now you would see the C# script.

There’re codes which were generated automatically.

6, Then we add callback functions of Move and Fire actions.

Add a script named PlayerMovement for Player first.

Remove PlayerInput Component which was added previously.

Then add code of action callback:

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

public class PlayerMovement : MonoBehaviour
{
    private TestInput Input;

    private Vector2 movementInput;

    void Awake()
    {
        Input = new TestInput();
        Input.Player.Move.performed += ctx => OnMovementChanged(ctx);
        Input.Player.Fire.performed += ctx => OnFire();
    }

    void OnMovementChanged(InputAction.CallbackContext Context)
    {
        movementInput = Context.ReadValue<Vector2>();
        Debug.Log("Move Direction: " + movementInput.ToString());
    }

    // Start is called before the first frame update
    void Start()
    {
    }

    // Update is called once per frame
    void Update()
    {
    }

    void FixedUpdate()
    {
    }

    private void OnEnable()
    {
        Input.Enable();
    }

    private void OnDisable()
    {
        Input.Disable();
    }

    void OnFire()
    {
        Debug.Log("Fire+++++++");
    }
}

Now when press Arrow Key or click left mouse button, OnMovementChanged() and OnFire() would be fired.

Another way to register callback functions.

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

public class PlayerMovement : MonoBehaviour
{
    [Space]
    [SerializeField]
    private InputActionAsset InputAssetRef;
    
    private Vector2 movementInput;

    void Awake()
    {
        InputActionMap PlayerInputMap = InputAssetRef.FindActionMap("Player");

        InputAction MoveAction = PlayerInputMap.FindAction("Move");
        MoveAction.performed += ctx => OnMovementChanged(ctx);

        InputAction FireAction = PlayerInputMap.FindAction("Fire");
        FireAction.performed += ctx => OnFire();
    }

    void OnMovementChanged(InputAction.CallbackContext Context)
    {
        movementInput = Context.ReadValue<Vector2>();
        Debug.Log("Move Direction: " + movementInput.ToString());
    }

    // Start is called before the first frame update
    void Start()
    {
    }

    // Update is called once per frame
    void Update()
    {
    }

    void FixedUpdate()
    {
    }

    private void OnEnable()
    {
        InputAssetRef.Enable();
    }

    private void OnDisable()
    {
        InputAssetRef.Disable();
    }

    void OnFire()
    {
        Debug.Log("Fire+++++++");
    }
}

Then specify the Input Action Asset in Inspector panel

Input Issues

GetKeyUp not registering after a long hold

Case:
Input.GetKeyUp() would not work after holding ended.

Caused by:

Solution:
Using Input.GetKey() to check if key had been held.

GetKey = machine gun

function Update () {
    if (Input.GetKey (KeyCode.Space))
        print ("space key is being held down");
}

GetKeyDown = single shot gun

function Update () {
    if (Input.GetKeyDown (KeyCode.Space))
        print ("space key was pressed once");
}

finally we have the key released handler

function Update () {
    if (Input.GetKeyUp (KeyCode.Space))
        print ("space key was released");
}

Reference:
http://johnstejskal.com/wp/understanding-getbutton-and-getkey-inputs-in-unity/

Input Reference

New Input (from 2019.1)

NEW INPUT SYSTEM in Unity - Brackeys (Recommended)
https://www.youtube.com/watch?v=Pzd8NhcRzVo

New Unity INPUT SYSTEM - Getting Started (Recommended)
https://www.youtube.com/watch?v=KNiM53UbGfA

Unity Input System | How to Use Input Action Assets (Recommended)
https://www.youtube.com/watch?v=mvuXOyKz7k4

Introducing the new Input System
https://blogs.unity3d.com/2019/10/14/introducing-the-new-input-system/
Quick start guide
https://docs.unity3d.com/Packages/com.unity.inputsystem@1.0/manual/QuickStartGuide.html?_ga=2.151614137.1431303805.1581172995-179986836.1581172995

An efficient and versatile input system for Unity.
https://github.com/Unity-Technologies/InputSystem

Input - Joystick

Keyboard and Joystick Controls in Unity 2019! (New Input System Tutorial)
https://www.youtube.com/watch?v=Gz0YcjXBJ3U
https://github.com/dawnarc/UnityExamples/tree/master/TopDownShooter

Controller Reference

Controller - Camera Controller

Unity3D 8 Directional Character System
https://www.youtube.com/watch?v=cVy-NTjqZR8

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