When you save a model, Mudbox saves any paint layers in the same directory as your .mud file. The paint layers are saved in a subdirectory with the same name as your .mud file with a -files extension (for example, <filename>-files). When you save your model using the FBX file format, any paint layers are saved in the same directory as your .fbx file in a subdirectory with the same name as your .fbx file with a .fbx-files extension (for example, <filename>.fbx-files).
Note also that when you save textures for a PTEX mesh, even if multiple PTEX objects share the same material, Mudbox creates separate PTEX files for each layer of each mesh. This occurs because the PTEX file format is unique to the topology of each mesh. For example, if you use the same material “PTEX-default” on PTEX object A and PTEX object B, you will have separate PTEX files for each mesh when you save their paint layers.
By default, Mudbox saves one image for each paint layer unless multiple UV tiles exist. In that case, Mudbox saves one image per UV tile. In addition, a background image that represents the background color for each channel (diffuse, specular, gloss) is saved to the files subdirectory.
Exporting paint layers can be useful, for example, if you want to further edit or enhance the image in an image editing application, or convert the paint layer into another file format. For a list of supported image formats, see Paint file formats. You can export the image from any paint layer and save it in any paint layer format that Mudbox supports, including PTEX. You can export a single paint layer, export all layers for a particular model, or export all paint layers in the scene. Paint layers can also be exported as Adobe® Photoshop® files using the .psd file format. See Create and edit paint layers using Photoshop.
To export a single paint layer
To export all paint layers for an active or selected model
All paint layers for the selected model are saved in the directory you specified in the Export All Paint Layers window. By default, layers are saved to your Data directory.
All paint layers in the scene are saved using the file naming convention and the directory you specified in the Export All Paint Layers window.