C#•8mo ago

Cannon not following mouse?

Hello! I'm trying to have my cannon change position based on where the mouse is, but it always chooses to the same angle when the mouse is clicked no matter its placement on the screen. Does anyone know what is causing this? And what I need to fix and with what? C# in Unity

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

public class CannonManager : MonoBehaviour
{
    public GameObject cannonBallPrefab;
    public Transform firePoint;


    private Camera _cam;
    private bool _pressingMouse = false;

    private Vector3 _initialVelocity;

    void Start()
    {
        _cam = Camera.main;
    }

    void Update()
    {
        if (Input.GetMouseButtonDown(0))
            _pressingMouse = true;
        if (Input.GetMouseButtonUp(0))
        {
            _pressingMouse = false;
            _Fire();
        }

        if (_pressingMouse)
        {
            // coordinate transform screen > world
            Vector3 mousePos = _cam.ScreenToWorldPoint(Input.mousePosition);
            mousePos.z = 0;

            // look at
            transform.LookAt(mousePos); 
        }
    }

    private void _Fire()
    {
        // instantiate a cannon ball
        GameObject cannonBall = Instantiate(cannonBallPrefab, firePoint.position, Quaternion.identity);
        // apply some force
        Rigidbody rb = cannonBall.GetComponent<Rigidbody>();
        rb.AddForce(_initialVelocity, ForceMode.Impulse);
    }
}

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

public class CannonManager : MonoBehaviour
{
    public GameObject cannonBallPrefab;
    public Transform firePoint;


    private Camera _cam;
    private bool _pressingMouse = false;

    private Vector3 _initialVelocity;

    void Start()
    {
        _cam = Camera.main;
    }

    void Update()
    {
        if (Input.GetMouseButtonDown(0))
            _pressingMouse = true;
        if (Input.GetMouseButtonUp(0))
        {
            _pressingMouse = false;
            _Fire();
        }

        if (_pressingMouse)
        {
            // coordinate transform screen > world
            Vector3 mousePos = _cam.ScreenToWorldPoint(Input.mousePosition);
            mousePos.z = 0;

            // look at
            transform.LookAt(mousePos); 
        }
    }

    private void _Fire()
    {
        // instantiate a cannon ball
        GameObject cannonBall = Instantiate(cannonBallPrefab, firePoint.position, Quaternion.identity);
        // apply some force
        Rigidbody rb = cannonBall.GetComponent<Rigidbody>();
        rb.AddForce(_initialVelocity, ForceMode.Impulse);
    }
}

5 Replies

Buddy•8mo ago

Just quick coding convention. C# does not use _ except for backing fields. so _Fire() would be Fire() Also what perspective is the camera? First-Person? Or top-down?

NerdyPegasusOP•8mo ago

Sideways? I'm trying to make the game angry birds styled in a way

NerdyPegasusOP•8mo ago

the cannonballs fire out of the cannon when the mouse is unclicked after being held down, so the fire function works, its just the angle of the cannon never changing I just realized I believe I was having issues because of my projection settings on my main camera being incorrect which was throwing off everything else Thank you for the help, I really appreciate it!

Buddy•8mo ago

:blobthumbsup: But I barely if ever helped, either way. No problem!

MODiX•8mo ago

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Cannon not following mouse?