Launching Projectiles | 3D | Unity Game Engine

LaunchProjectile.cs

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

public class LaunchProjectile : MonoBehaviour
{
    public Transform launchPoint;
    public GameObject projectile;
    public float launchVelocity = 10f;

    void Update()
    {
        if(Input.GetButtonDown("Fire1"))
        {
            var _projectile = Instantiate(projectile, launchPoint.position, launchPoint.rotation);
            _projectile.GetComponent<Rigidbody>().velocity = launchPoint.up * launchVelocity;
        }
    }
}

Projectile.cs

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

public class Projectile : MonoBehaviour
{
    public float life = 5f;

    void Awake()
    {
        Destroy(gameObject, life);
    }
}

2D Tank Movement and Shooting | Unity Game Engine

Tank2D.cs

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

public class Tank2D : MonoBehaviour
{
    public Transform bulletSpawnPoint;
    public GameObject bulletPrefab;
    public float bulletSpeed = 10;
    public float moveSpeed = 2;

    void Update()
    {
        Movement();
        Shooting();
    }

    void Movement()
    {
        float h = Input.GetAxisRaw("Horizontal");
        float v = Input.GetAxisRaw("Vertical");
        if (h != 0)
        {
            transform.position += new Vector3(h * moveSpeed * Time.deltaTime, 0, 0);
            transform.rotation = Quaternion.Euler(0, 0, -90 * h);
        }
        else if (v != 0)
        {
            transform.position += new Vector3(0, v * moveSpeed * Time.deltaTime, 0);
            transform.rotation = Quaternion.Euler(0, 0, 90 - 90 * v);
        }
    }

    void Shooting()
    {
        if(Input.GetKeyDown(KeyCode.Space))
        {
            var bullet = Instantiate(bulletPrefab, bulletSpawnPoint.position, bulletSpawnPoint.rotation);
            bullet.GetComponent<Rigidbody2D>().velocity = bulletSpawnPoint.up * bulletSpeed;
        }
    }
}

Bullet.cs

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

public class Bullet : MonoBehaviour
{
    public float life = 3;

    void Awake()
    {
        Destroy(gameObject, life);
    }

    void OnCollisionEnter2D(Collision2D collision)
    {
        Destroy(collision.gameObject);
        Destroy(gameObject);
    }
}

Simple Shooting | 3D | Bullets | Unity Game Engine

Gun.cs

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

public class Gun : MonoBehaviour
{
    public Transform bulletSpawnPoint;
    public GameObject bulletPrefab;
    public float bulletSpeed = 10;

    void Update()
    {
        if(Input.GetKeyDown(KeyCode.Space))
        {
            var bullet = Instantiate(bulletPrefab, bulletSpawnPoint.position, bulletSpawnPoint.rotation);
            bullet.GetComponent<Rigidbody>().velocity = bulletSpawnPoint.forward * bulletSpeed;
        }
    }
}

Bullet.cs

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

public class Bullet : MonoBehaviour
{
    public float life = 3;

    void Awake()
    {
        Destroy(gameObject, life);
    }

    void OnCollisionEnter(Collision collision)
    {
        Destroy(collision.gameObject);
        Destroy(gameObject);
    }
}

Simple Shooting | 2D | Bullets | Unity Game Engine

Gun2D.cs

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

public class Gun2D : MonoBehaviour
{
    public Transform bulletSpawnPoint;
    public GameObject bulletPrefab;
    public float bulletSpeed = 10;

    void Update()
    {
        if(Input.GetKeyDown(KeyCode.Space))
        {
            var bullet = Instantiate(bulletPrefab, bulletSpawnPoint.position, bulletSpawnPoint.rotation);
            bullet.GetComponent<Rigidbody2D>().velocity = bulletSpawnPoint.up * bulletSpeed;
        }
    }
}

Bullet.cs

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

public class Bullet : MonoBehaviour
{
    public float life = 3;

    void Awake()
    {
        Destroy(gameObject, life);
    }

    void OnCollisionEnter2D(Collision2D collision)
    {
        Destroy(collision.gameObject);
        Destroy(gameObject);
    }
}

Drag & Drop | Screen-Space UI Elements | Unity Game Engine

DragDropUI.cs

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

public class DragDropUI : MonoBehaviour, IPointerDownHandler, IDragHandler, IPointerUpHandler
{
    Vector3 offset;
    CanvasGroup canvasGroup;
    public string destinationTag = "DropArea";

    void Awake()
    {
        if (gameObject.GetComponent<CanvasGroup>() == null)
            gameObject.AddComponent<CanvasGroup>();
        canvasGroup = gameObject.GetComponent<CanvasGroup>();
    }

    public void OnDrag(PointerEventData eventData)
    {
        transform.position = Input.mousePosition + offset;
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        offset = transform.position - Input.mousePosition;
        canvasGroup.alpha = 0.5f;
        canvasGroup.blocksRaycasts = false;
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        RaycastResult raycastResult = eventData.pointerCurrentRaycast;
        if(raycastResult.gameObject?.tag == destinationTag)
        {
            transform.position = raycastResult.gameObject.transform.position;
        }
        canvasGroup.alpha = 1;
        canvasGroup.blocksRaycasts = true;
    }
}

Drag & Drop | World-Space 3D Objects | Unity Game Engine

DragDrop.cs

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

public class DragDrop : MonoBehaviour
{
    Vector3 offset;
    public string destinationTag = "DropArea";

    void OnMouseDown()
    {
        offset = transform.position - MouseWorldPosition();
        transform.GetComponent<Collider>().enabled = false;
    }

    void OnMouseDrag()
    {
        transform.position = MouseWorldPosition() + offset;
    }

    void OnMouseUp()
    {
        var rayOrigin = Camera.main.transform.position;
        var rayDirection = MouseWorldPosition() - Camera.main.transform.position;
        RaycastHit hitInfo;
        if(Physics.Raycast(rayOrigin, rayDirection, out hitInfo))
        {
            if(hitInfo.transform.tag == destinationTag)
            {
                transform.position = hitInfo.transform.position;
            }
        }
        transform.GetComponent<Collider>().enabled = true;
    }

    Vector3 MouseWorldPosition()
    {
        var mouseScreenPos = Input.mousePosition;
        mouseScreenPos.z = Camera.main.WorldToScreenPoint(transform.position).z;
        return Camera.main.ScreenToWorldPoint(mouseScreenPos);
    }
}

Adding bounciness to the game object | Unity Game Engine

Character movement via on-screen Joystick controller input | Rigidbody | Unity Game Engine

JoystickController.cs

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

public class JoystickController : MonoBehaviour, IPointerDownHandler, IDragHandler, IPointerUpHandler
{
    [SerializeField]
    private float maxDisplacement = 200;
    Vector2 startPos;
    Transform handle;

    public static float Horizontal = 0, Vertical = 0;

    void Start()
    {
        handle = transform.GetChild(0);
        startPos = handle.position;
    }

    void UpdateHandlePosition(Vector2 pos)
    {
        var delta = pos - startPos;
        delta = Vector2.ClampMagnitude(delta, maxDisplacement);
        handle.position = startPos + delta;
        Horizontal = delta.x / maxDisplacement;
        Vertical = delta.y / maxDisplacement;
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        UpdateHandlePosition(eventData.position);
    }

    public void OnDrag(PointerEventData eventData)
    {
        UpdateHandlePosition(eventData.position);
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        UpdateHandlePosition(startPos);
    }
}

JoystickMove.cs

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

[RequireComponent(typeof(Rigidbody))]
public class JoystickMove : MonoBehaviour
{
    public float speed = 5;
    Rigidbody rigidBody;

    void Awake()
    {
        rigidBody = GetComponent<Rigidbody>();
    }

    void FixedUpdate()
    {
        float inputH = JoystickController.Horizontal;
        float inputV = JoystickController.Vertical;
        rigidBody.velocity = new Vector3(inputH * speed, rigidBody.velocity.y, inputV * speed);
    }
}