Unity：LoadSceneMode.Additive模式Windows构建失效，无法显示双场景

Hey there! I’ve dealt with this exact Additive scene loading issue a bunch of times—works flawlessly in the editor but breaks in Windows builds? Let’s walk through the most likely fixes step by step:

First things first: Open File > Build Settings and make sure both scenes you want to load are in the Scenes In Build list. The Unity editor can access any scene in your project, but when you build for Windows, only the scenes added to this list get included in the final executable. If your second scene is missing here, it won’t load at all in the build.

9 times out of 10, this is the culprit. Two scenes with default camera settings will fight over rendering:

• Adjust Clear Flags: Don’t leave both cameras set to Skybox. Set one to Depth Only so their render outputs stack instead of overwriting each other.
• Tweak Camera Depth: Give the camera from your additive scene a higher Depth value (e.g., main scene camera = 0, additive scene camera = 1). This ensures the additive scene’s content renders on top of the main scene.
• Verify Culling Mask: Make sure neither camera is excluding the layer(s) where the other scene’s objects live. Double-check that all relevant layers are checked in the Culling Mask dropdown.

Make sure your scene loading logic is solid and doesn’t have hidden issues:
Here’s a clean example of additive loading code to reference:

using UnityEngine;
using UnityEngine.SceneManagement;

public class SceneLoader : MonoBehaviour
{
    public void LoadAdditiveScene()
    {
        // Replace with your scene's exact name (case-sensitive!)
        SceneManager.LoadScene("YourAdditiveScene", LoadSceneMode.Additive);
    }

    // Optional: Log scene load events to confirm success
    private void OnEnable()
    {
        SceneManager.sceneLoaded += OnSceneLoaded;
    }

    private void OnSceneLoaded(Scene scene, LoadSceneMode mode)
    {
        Debug.Log($"Successfully loaded scene: {scene.name} | Mode: {mode}");
    }

    private void OnDisable()
    {
        SceneManager.sceneLoaded -= OnSceneLoaded;
    }
}

• Enable logging in your build: Go to PlayerSettings > Other Settings > Enable Logging to check if the scene actually loads in the Windows build. You can view logs by running the executable from a command prompt, or use Unity’s built-in log viewer tools.
• Avoid accidental unloads: Make sure you’re not calling SceneManager.UnloadSceneAsync or switching to LoadSceneMode.Single somewhere else in your code.

• In your additive scene, confirm that root objects and key renderable objects are set to Active (not disabled by default). It’s easy to forget you manually activated them in the editor, but the build will use the scene’s saved state.
• Verify that objects in the additive scene are positioned within the camera’s field of view. A common mistake is having objects spawn outside the camera’s frustum, making them invisible even if the scene loads.

• Go to Player Settings > PC, Mac & Linux Standalone > Other Settings:
  • Try switching the Graphics API (e.g., from Direct3D12 to Direct3D11)—sometimes newer APIs have compatibility issues with scene stacking.
  • If all else fails, toggle off Multithreaded Rendering. This can resolve race conditions that cause scenes to not render properly, though it might impact performance slightly.

Pack a standalone build of just the additive scene to confirm it renders correctly. If it doesn’t load or display properly on its own, the issue is with the scene itself (missing resources, broken prefabs, etc.) rather than the additive loading logic.

内容的提问来源于stack exchange，提问作者Byungkyu Kim