There's a need for multiple selection across multiple levels, but I didn't find the good feedback to show this kind of selection to the user yet. If it's technically possible, what about displaying some kind of indicator in the tab of the levels where some items are selected?
I thought of doing a search and replace of the texture in the sh3d file, but couldn't quite figure out the structure of the file...
The structure is simple: it's a zip file with a Home entry for the home data and numeric entries (0, 1, 2, 3...) for the 3D models files and the images used in the designed home. So, you should create a backup of your sh3d file, open it with a zip utility (maybe changing its extension by zip first), and edit each of the entries until you find the image you want to replace. The biggest problem is that zip entries don't have any extension so it's not easy to guess if it's some text or an image.
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Emmanuel Puybaret, Sweet Home 3D creator
