(Unity)Input.GetAxisRawで砲弾を発射する。

(スクリプト)

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

public class AxisShot : MonoBehaviour
{
    public GameObject shellPrefab;
    public AudioClip sound;
    private int count = 0;

    void Update()
    {
        var input = Input.GetAxisRaw("Vertical");

        if(input == 1)
        {
            count += 1;

            if(count == 1)
            {
                GameObject shell = Instantiate(shellPrefab, transform.position, Quaternion.identity);
                Rigidbody shellRb = shell.GetComponent<Rigidbody>();
                shellRb.AddForce(transform.forward * 1000);
                Destroy(shell, 10f);
                AudioSource.PlayClipAtPoint(sound, transform.position);
            }
        }

        // ジョイスティックから手を離すとリセット
        if(input == 0)
        {
            // リセット
            count = 0;
        }
    }
}

(実行結果)