seamless switch between 2 identical spaces


I would like to create a seamless switch between two identical spaces in the level.
Please let me elaborate:

I want to create a plain on which you render a texture.
If I walk through the plain I seamlessly enter the area which was rendered on the plain.
I realize I’ve to use renderTextures and Triggers but I don’t know how to set them up to give the wanted (seamless) effect.

How can I do this in Unity (pro)?

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