How to implement PIP 3D overlay

I have a 3D scene setup and now I’d like to add a PIP display in the corner of the main screen that shows a separate 3D scene. How can I achieve this in jMonkeyEngine?

What you want is called “Offscreen Rendering” or “Render to Texture”.

That way you actually have a Textured Quad (which belongs to the GuiNode for your use case)

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where would I find an example which demonstrates how to do off screen rendering with JMonkeyEngine?

See here: Render to Texture
and jmonkeyengine/ at master · jMonkeyEngine/jmonkeyengine · GitHub

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reading through the wiki, I also found the following which shows how to implement a PIP:

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Yes, the view ports give you the opportunity to render another rectangle.
If your minimap is circular or n-gonal, then view port is inferior to render-to-texture.
So, the view port is good for split screens and rectangular minimaps.
The render-to-texture is good for anything non-rectangular…