why the SH users can't decide if they want use the smooth?
This option should be set by 3D designers when they export their model to OBJ format, not by end-users who just want to import missing models to layout them. If the model isn't nice looking, it's the 3D designer fault not theirs. Please keep also in mind that the target audience of Sweet Home 3D isn't experts. There are plenty of very special options I could add to Sweet Home 3D, but I'm not interested to create a software as complicate to learn as Blender (no offense to Blender developers).
SunFlow rendering engine might not be perfect but look here what you could get with a little patience; the same patience is probably necessary to get the very nice image you pointed to.
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Emmanuel Puybaret, Sweet Home 3D creator
