Scene Load Unload and Managment

🌵 Needle Engine
1

Dear team,
I have a very simple scene manager scene which works as a platform select:
android or iOS. I have this structure: My Home Scene with two buttons: Android and iOS. When I press the Android button i expect to switch to my Android scene. When I press the iOS button I expect to switch to my iOS scene. However when using scene switcher with SceneSwitcher.select the correct scene is loaded but my Home scene is still loaded. I wanted to unload the home scene and stay only in my Android or iOS scene. What is the best way to do that via script/function. I am building a WebXr experience and want only one scene to be loaded for performance goals.
Best wishes!

2

Hi Julian,

To achieve your goal of unloading the home scene after selecting either the Android or iOS scene, you can utilize the unload() method available in your SceneSwitcher class before switching to a new scene.

Here’s a basic script outline demonstrating how you might handle the button press and perform the scene switch correctly:

import { SceneSwitcher, AssetReference } from "@needle-tools/engine";

// Assume this is your scene switcher instance
const sceneSwitcher: SceneSwitcher = ...; // initialize your scene switcher

// Method to switch scenes
async function switchScene(sceneUrl: string) {
    // Unload the current home scene
    await sceneSwitcher.unload();
    
    // Create an AssetReference for the new scene
    const newScene = new AssetReference(sceneUrl);

    // Switch to the new scene
    const success = await sceneSwitcher.switchScene(newScene);
    if (success) {
        console.log("Switched to:", sceneUrl);
    } else {
        console.error("Failed to switch scene:", sceneUrl);
    }
}

// Example button handlers
document.getElementById("androidButton").addEventListener("click", () => switchScene("path/to/androidScene.glb"));
document.getElementById("iosButton").addEventListener("click", () => switchScene("path/to/iosScene.glb"));

Key Points:

  • Call sceneSwitcher.unload() before switching to the new scene using sceneSwitcher.switchScene(newScene).
  • Ensure sceneUrl points to the correct paths of your respective scenes, such as “path/to/androidScene.glb” and “path/to/iosScene.glb”.

This method will ensure that the home scene is unloaded, thereby meeting your performance goals for a single-loaded scene during your WebXR experience. If you need any further adjustments or clarifications, feel free to ask!

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