interactable が選択された時に処理を実行

1. 対象のGameObjectにXR Simple Interactableをアタッチ
2. 対象のGameObjectに以下のScriptをアタッチ

using UnityEngine;
using UnityEngine.XR.Interaction.Toolkit;
using UnityEngine.XR.Interaction.Toolkit.Interactables;

public class Cube : MonoBehaviour
{
	public XRSimpleInteractable interactable;
	public Transform leftController;//Near-Far Interactorをアタッチ

	void OnSelect(SelectEnterEventArgs args){
		var s=transform.localScale;
		if(args.interactorObject.transform==leftController){
			transform.localScale=s*0.5f;
		}else{
			transform.localScale=s*2f;
		}
		Debug.Log("selected");
	}

	void OnEnable(){ interactable.selectEntered.AddListener(OnSelect); }
	void OnDisable(){ interactable.selectEntered.RemoveListener(OnSelect); }
}

3. InspectorでScriptのinetactableのフォームに、XR Simple Interactableを設定
4. InspectorでScriptのleftControllerのフォームに、LeftController/Near-Far Interactorを設定

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