Question Switch between scenes without reloading

Hi
My app is pretty large, and I have two scenes. The main guts of the app is all within a single scene (mainscene) where i show and hide different sections dependent on what is relevant. I have found this is far faster than creating multiple scenes reusing some rather large environment assets.

I have recently had to create a second scene (videoscene ) to play videos as the package I purchaed won't work with this architecture

This means when the video finishes playing i switch back to mainscene. Is there a way to keep mainscene e.g. cached/in memory/something similar so i don't experience such a long delay when switching back from the videoscene to mainscene

thanks

 

The most obvious thing would to just leave the main scene loaded. I don't understand why you need to unload the main scene. Can you elaborate on that?

 

thanks for getting back to me
i guess that is a reflection of my ignorance
I thought I had to switch scenes. How do I toggle between the two and keep them both loaded? At the moment I use this
SceneManager.LoadScene();

How can i keep both scenes loaded?

 

You can actually have multiple scenes open at the same time in Unity. You just need to open them in additive mode:
https://docs.unity3d.com/ScriptReference/SceneManagement.LoadSceneMode.Additive.html

You can also open multiple scenes in the editor too, by right-clicking on the scene and selecting "open scene additive." Multiple scenes are useful for a lot of things.

If you unload an additive scene, the assets used in that seen are not unloaded from memory, from what I understand. That video will probably take-up a big chunk of it, too. You may need to call Resources.UnloadUnusedAssets() additionally.
https://docs.unity3d.com/ScriptReference/Resources.UnloadUnusedAssets.html

 

ok thanks - i am only looking to do this in the runtime app - will take a look at the resources and see if i can work it out
thanks for your help

 

According to this thread they are unloaded, as long as they're actually 'unused' at that point: Question - Memory profiler; Textures remain in memory and point to references that have been destroyed? - Unity Forum

Edit: Although the docs for UnloadAsync state: Note: Assets are currently not unloaded. In order to free up asset memory call Resources.UnloadUnusedAssets.
Unity - Scripting API: SceneManagement.SceneManager.UnloadSceneAsync (unity3d.com)
So, lets keep it at 'maybe'..

 

Hi - i have just found a problem with using LoadSceneMode.Additive and am hoping you can help
I have a reticle pointer attached to my camera which is needed in both scenes.

If I use LoadSceneMode.Additive then both scenes are active and the reticle pointer doesn't appear in the newly loaded scene, although i am getting the correct camera view. Do you have any suggestions on how i can fix this?

thanks