Skyboxの更新

UpdateSkybox.cs

using System.Collections;
using UnityEngine;

public class UpdateSkybox : MonoBehaviour {

    [SerializeField] Cubemap[] cubemaps; // 複数のIBL画像

    IEnumerator Start ()
    {
        int skyboxID = Shader.PropertyToID("_Tex");
        // cubemapを作成しSkyboxに登録し、
        // 反射モードをcustomに入り替え
        var cubemapMaterial = new Material(Shader.Find("Skybox/Cubemap"));
        RenderSettings.skybox = cubemapMaterial;
        RenderSettings.defaultReflectionMode = UnityEngine.Rendering.DefaultReflectionMode.Custom;

        // 2秒ごとにSkyboxを更新
        for(int i=0; ; i++)
        {
            if (i >= cubemaps.Length) { i = 0; }

            // テクスチャとCubemapを更新
            cubemapMaterial.SetTexture(skyboxID, cubemaps[i]);
            RenderSettings.customReflection = cubemaps[i];
            yield return new WaitForSeconds(2);
        }
	}
}