I would suggest to create a large white zone around you building, and cut / paste everything else on top of that.
Do you mean create a large white image .png and use this as the background, then copy and paste everything on to that?Simpler than that: create a rectangle room that surrounds all your design as in the attached file.
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KWS_1stFloor - TEST.sh3d
(845152 bytes)
(Download count: 19643)
(Surrounding room)----------------------------------------
Emmanuel Puybaret, Sweet Home 3D creator
