矢のセットアップ

1. 矢にRigidbodyコンポーネントを追加し、Use Gravity のチェックを外す
2. Capsule Collider を追加し、Radius=0.03、Height=0.8、Is Trigger にチェックを付ける
3. 矢の機能を呈するスクリプト Arrow.cs を作成し、Arrow にアタッチ

   
   using UnityEngine;
   
   public class Arrow : MonoBehaviour
   {
   	public float groundSpeed=7.5f;//馬の速度
   	public float launchSpeed=10f;
   	public float magnify=2f;
   
   	public GameObject bow;
   
   	bool flying=false;
   
   	float launched;    
   	public void Ready(){
   		transform.parent=bow.transform;
   		transform.localPosition=new Vector3(0, 0, -0.3f);
   		transform.localRotation=Quaternion.Euler(90f, 0f, 0f);
   		transform.localScale=new Vector3(1f, 1f, 1f);
   		GetComponent<Rigidbody>().linearVelocity=Vector3.zero;
   		flying=false;
   	}
   
   	public void Fire(){
   		var v=Vector3.forward*groundSpeed + transform.up*launchSpeed;
   		GetComponent<Rigidbody>().linearVelocity=v;
   
   		transform.parent=null;
   		launched=Time.time;
   		flying=true;
   	}
   
   	void Update()
   	{
   		if(flying){
   			var flyingTime=Time.time-launched;
   			if(flyingTime>3f){
   				Ready();
   			}else{
   				var scale = 1f + magnify*flyingTime;
   				transform.localScale=new Vector3(scale, scale, scale);
   			}
   		}
   	}
   }
   

4. Bow を Inspector で D&D
5. Bow.cs に以下のスクリプトを追記

   
   using UnityEngine;
   using UnityEngine.InputSystem;
   
   public class Bow : MonoBehaviour
   {
   	public GameObject leftController;	
   	public GameObject rightController;
   	public GameObject arrow;
   		
   	enum State{Idle, Pull, Ready}
   	public State state;
   	
   	void Start()
   	{
   		var a=new InputSystem_Actions();
   		a.Enable();
   		a.Player.Sprint.performed+=OnFire;
   
   		state=State.Idle;
   	}
   
   	void Update()
   	{
   		float d=Vector3.Distance(
   			leftController.transform.position,
   			rightController.transform.position
   		);
   		//Debug.Log(d);
   
   		switch(state){
   			case State.Idle:
   				if(d<0.4f) state=State.Pull;
   				break;
   			case State.Pull:
   				if(d>0.4f){
   					GetComponent<Animation>().Play("BowPullAnimation");
   					arrow.GetComponent<Arrow>().Ready();
   					state=State.Ready;
   				}
   				break;
   		}
   	}
   	void OnFire(InputAction.CallbackContext c){
   		Debug.Log("fire");
   		if(state==State.Ready){
   			GetComponent<Animation>().Play("BowReleaseAnimation");
   			arrow.GetComponent<Arrow>().Fire();
   			state=State.Idle;
   		}
   	}
   }
   

6. Arrow を Inspector で D&D
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