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The order is as follows: 1) upload to the site spherical panoramas from which you plan to create a virtual tour; 2) from the list of uploaded panoramas add each panorama to the virtual tour (Add to 3D tour link); 3) open the created virtual tour, edit the panorama order, select the main panorama, set transition points (tunnels).
The article describes step by step how to make not standard renders (photo format), but a panorama in 3dsMax + Corona Render 3d visualization modeling programs.