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 velocity=10f;
   	public float magnify=2f;
   	public bool flying=false;
   
   	public Horse horse;
   	public Transform bow;
   
   	float launchTime;//射出時刻
   	Vector3 Velocity=>Vector3.forward*horse.velocity + transform.up*velocity;
   	float FlyingTime=>Time.time-launchTime;
   	Vector3 FlyingScale=>Vector3.one * (1f + magnify*FlyingTime);
   
   	public void Ready(){
   		transform.localScale=Vector3.one;
   		GetComponent<Rigidbody>().linearVelocity=Vector3.zero;
   		transform.parent=bow;
   		transform.localPosition=new Vector3(0, 0, -0.3f);
   		transform.localRotation=Quaternion.Euler(90f, 0f, 0f);
   		flying=false;
   	}
   
   	public void Fire(){
   		transform.parent=null;
   		GetComponent<Rigidbody>().linearVelocity=Velocity;
   		launchTime=Time.time;
   		flying=true;
   	}
   
   	void Update()
   	{
   		if(flying){
   			transform.localScale=FlyingScale;
   			if(FlyingTime>3f) flying=false;
   		}
   	}
   }
   

4. Horse, 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 InputAction trigger;
   	public Transform leftController;	
   	public Transform rightController;
   	public Arrow arrow;
   		
   	enum State{Idle, Grab, Pull}
   	State state=State.Idle;
   	
   	float Distance=>Vector3.Distance(leftController.position, rightController.position);
   
   	void Update()
   	{
   		switch(state){
   			case State.Idle:
   				if(Distance<0.4f && !arrow.flying){
   					arrow.Ready();
   					state=State.Grab;
   				}
   				break;
   			case State.Grab:
   				if(Distance>0.4f){
   					GetComponent<Animation>().Play("BowPullAnimation");
   					state=State.Pull;
   				}
   				break;
   		}
   	}
   
   	void OnFire(InputAction.CallbackContext c){
   		if(state==State.Pull){
   			GetComponent<Animation>().Play("BowReleaseAnimation");
   			arrow.Fire();
   			state=State.Idle;
   		}
   	}
   
   	・・・
   }
   

6. Arrow を Inspector で D&D
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