using UnityEngine;

public class SkyCapture : MonoBehaviour
{
    public Camera mainCamera;
    public Material reflectionSkyboxMaterial;
    public RenderTexture skyRenderTexture;

    private Camera skyCaptureCamera;

    void Start()
    {
        // 创建一个隐藏的截图相机
        GameObject camObj = new GameObject("SkyCaptureCam");
        skyCaptureCamera = camObj.AddComponent<Camera>();
        skyCaptureCamera.enabled = false;

        // 配置截图用的 RenderTexture
        skyRenderTexture = new RenderTexture(1024, 1024, 16, RenderTextureFormat.ARGB32);
        skyRenderTexture.Create();

        // 配置 skybox 材质（你需要一个简单的 Skybox/6 Sided Shader 材质）
        reflectionSkyboxMaterial.SetTexture("_FrontTex", skyRenderTexture);
        reflectionSkyboxMaterial.SetTexture("_BackTex", skyRenderTexture);
        reflectionSkyboxMaterial.SetTexture("_LeftTex", skyRenderTexture);
        reflectionSkyboxMaterial.SetTexture("_RightTex", skyRenderTexture);
        reflectionSkyboxMaterial.SetTexture("_UpTex", skyRenderTexture);
        reflectionSkyboxMaterial.SetTexture("_DownTex", skyRenderTexture);
    }

    void LateUpdate()
    {
        // 将截图相机位置同步到主相机
        skyCaptureCamera.transform.position = mainCamera.transform.position;
        skyCaptureCamera.transform.rotation = mainCamera.transform.rotation;

        skyCaptureCamera.CopyFrom(mainCamera);
        skyCaptureCamera.cullingMask = LayerMask.GetMask("Sky", "Clouds"); // 只渲染天空和云层
        skyCaptureCamera.targetTexture = skyRenderTexture;
        skyCaptureCamera.clearFlags = CameraClearFlags.Skybox;

        skyCaptureCamera.Render();
    }
}