using UnityEngine;
using UnityEditor;

public class RenderSkyboxToCubemap : MonoBehaviour
{
    [MenuItem("Tools/Render Procedural Skybox To Cubemap")]
    static void RenderToCubemap()
    {
        // 创建一个临时摄像机
        GameObject go = new GameObject("SkyboxCaptureCamera", typeof(Camera));
        Camera cam = go.GetComponent<Camera>();
        cam.clearFlags = CameraClearFlags.Skybox;
        cam.cullingMask = 0; // 不渲染任何物体，只渲染天空

        // 创建 Cubemap
        int resolution = 1024;
        Cubemap cube = new Cubemap(resolution, TextureFormat.RGBA32, false);

        // 渲染天空盒到 Cubemap
        cam.RenderToCubemap(cube);

        // 保存为资源文件
        string path = "Assets/RenderedSkyboxCubemap.cubemap";
        AssetDatabase.CreateAsset(cube, path);
        AssetDatabase.SaveAssets();

        // 清理
        GameObject.DestroyImmediate(go);

        Debug.Log("✅ Skybox 已成功渲染并保存为 Cubemap： " + path);
    }
}