Code: Select all

using System.Collections.Generic;
using UnityEngine;

public class LayerController : MonoBehaviour
{
    private readonly List<Renderer> renderers = new List<Renderer>();

    private void Awake () => GetComponentsInChildren<Renderer>(true, renderers);

    public void HandleLayerHeld (int layer)
    {
        foreach (var renderer in renderers)
            SetLayer(renderer, true, layer);
    }

    public void HandleLayerReleased (int layer)
    {
        foreach (var renderer in renderers)
            SetLayer(renderer, false, layer);
    }

    private void SetLayer (Renderer renderer, bool enabled, int layer)
    {
        renderer.enabled = enabled;
        renderer.gameObject.layer = layer;
    }
}