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Comprehensive Guide to Babylon.js Game Engine

/The Render Loop

/Multiple Scenes in the Render Loop

Multiple Scenes in the Render Loop

Multiple Scenes in the Render Loop

For applications with multiple scenes (e.g., a 3D world and a UI overlay):

engine.runRenderLoop(() => {
    // Render main game scene
    gameScene.render();
    
    // Render UI overlay scene (without clearing the canvas)
    uiScene.autoClear = false; // Don't clear previous scene
    uiScene.render();
});