RenderTexture and setVirtualViewport

RenderTexture and setVirtualViewport
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I have a question regarding RenderTexture and the method setVirtualViewport
I am try to draw to a small rectangle from a bunch of nodes.

What I am trying to achieve is setting the viewPort of my renderTexture to be a small rectangle and whenever a node passes through the area of the renderTexture viewport I want it to draw to the texture, while keeping its original scale