Refresh model tree

When I display model tree and only then add new model using "scene.addModel" the model tree does not get refreshed to display the added nodes. I have also tried to add scene.update(); and runtime.refresh(); but without any luck.
How to force model tree to refresh?

The model tree is published from the 3D API to the Acrobat UI when the 3D annotation is initialized (i.e. when the embedded script completes running for the first time). After that, the only changes you will see occur when a selection event bubble is triggered, so in your case where the models are being loaded after the init loop finishes, you need to force a selection event to fire by temporarily picking and unpicking the newest node in the scene:
scene.addModel("pdf://something.u3d");
scene.selectedNode = scene.meshes.getByIndex(scene.meshes.count-1);
scene.selectedNode = undefined;
That will show your new node in the tree panel in the UI. What you're seeing is 'unintentional correct behavior' in the sense that there's no way to hide an entry in the tree so tying the UI update to a specific event bubble allows someone to add a model, set it to invisible, and avoid the node declaring itself in the UI until the author wants you to see it. Yes, we should have documented what I just told you... but you're only the second person to ask and it's been like this for years
Most people will preload eall the resources during the init loop and set the dynamic bits of the model to invisible - in which case the tree lists everything. You're seeing that effect with your "Time 0 (0)" node.

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Thanks.
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