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This is a paid asset, but now you can download Showroom Environment Free.
Detail this asset from Unity Store: Original Link
Showroom Environment v0.4
This package contains a showroom where you will be able to display your 3D models and or your 2D arts.
Ideal for a virtual portfolio presentation or any VR experience.
Note : To assure the best visual quality , you will need to import the “effects” package from the standard assets of Unity