Input between scenes; is there a solution yet?

When you switch scenes while holding an input down, that input will be set to 0 in the next scene. That means if you're not specifically working your game around so that your player releases the movement keys, they'll stop until the player re-taps the keys, which in some cases can completely kill the momentum of the game.

There are three solutions that seem to float around.

1: Import user32.dll on Windows

Code (CSharp):

1. [DllImport("user32.dll")]
2. public static extern short GetAsyncKeyState(int vkey);
3.  
4. void Update() {
5.     if ( GetAsyncKeyState(0x25 & 8000) > 0)
6.         Debug.Log("Left key pressed");
7. }

• It is hacky to import a DLL for input only
• You need to know the key codes ahead of time (they're constants, so not a really big problem)
• No gamepad support
• Kills cross-platform compatibility

2: Use additive loading and unload the previous scene

Code (CSharp):

1. void Update(){
2.     velocity.x = Input.GetAxisRaw("Horizontal");
3.     // Same happens with Input.GetKey().
4.     if(shouldNewSceneLoad) {
5.         SceneManager.LoadScene(newScene, LoadSceneMode.Additive);
6.         SceneManager.UnloadSceneAsync(oldScene);
7.     }
8. }

• Causes weird issues where the old scene won't be unloaded because Unity still thinks it's the active scene
• Also happens if I set the active scene with

  SceneManager.SetActiveScene()

  .

3: Put everything in one scene, just far apart

• Editing this becomes a mess
• Completely defeats the purpose of scenes as self-contained levels

I'm currently using method 1, but have there been any better ways to handle this since mid-2018? I did try the new Input system, but it doesn't seem to work in 2019.2.11f1 (perhaps because 2019.2.12 came out?).

 

I had same problem. I tried additive scene loading. Its work but created bad side effects for my project. So i write this script that first unloading old scene later load additive new scene.

Code (CSharp):

1.  
2.     public void load(string scene) {
3.         var temp = SceneManager.CreateScene("temp");
4.         SceneManager.UnloadSceneAsync(SceneManager.GetActiveScene()).completed += i => {
5.             SceneManager.LoadSceneAsync(scene, LoadSceneMode.Additive).completed += j => {
6.                 SceneManager.SetActiveScene(SceneManager.GetSceneByName(scene));
7.                 SceneManager.UnloadSceneAsync(temp);
8.             };
9.         };
10.     }
11.