Polygonal meshes

• Only the current subdivision level is exported when exporting a mesh from Mudbox using FBX. Any sculpt layers not locked to that subdivision level are baked into the resulting mesh when it gets exported. The current subdivision level becomes the base level for the exported mesh. If you want to preserve the separate sculpt layers, turn on the Export Sculpt Layers as Blendshapes preference in the Preferences window. For more information, see FBX.

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Paint layers

• When a Mudbox scene is exported using FBX, a subdirectory titled <filename>.fbx-files is created to store any associated paint layers (textures). If you prefer that the FBX file reference the paint layers (textures) in the same directory as the .mud scene (<filename>-files), turn on the Reference Textures from .MUD File preference within the preferences window. For more information, see FBX preferences.
• By default, any paint layers that exist on a model being exported (including the background color) are saved as discrete textures when exporting from Mudbox using the FBX format. If the 3D application supports it, the textures usually appear as layered textures on the model's shading material. For example, within Maya, the Mudbox paint layers will appear within the shading material as layered textures.
• Layer blend mode attributes for layered (composite) textures are supported to a limited extent for export. The Normal, Multiply, and Add blend mode settings are exported with the material. Any other layer blend mode properties that are set for any layered textures in the file are set to Normal when an FBX file is exported from Mudbox. When this occurs, the following warning is displayed: “Paint Layer Blend Mode: <blend mode name> is not supported in FBX, it will be converted to the Normal blend mode”.
• If the Flatten Paint Layers On Export preference is turned on when exporting (see below), the resultant flattened texture will look correct regardless of the blend mode settings.
• Some 3D applications do not universally support multiple layered textures within a single texture channel. In these circumstances, turning on the Flatten Paint Layers On Export preference is recommended. This causes the paint layers to be merged into one texture per channel during export. The flatten operation also includes the background color for the material.
• Normal Map channels that contain multiple paint layers (and have the Preview As Paint Layer property turned on) will automatically be flattened to one paint layer when exported as FBX. This occurs because some 3D applications do not support the rendering of multiple normal map channels in a material.
• Bump/Displacement Map channels that contain multiple paint layers (and have the Preview As Bump Layer property turned on) will automatically be flattened to one paint layer when exported as FBX. This occurs because some 3D applications do not support the rendering of multiple normal map channels in a material.

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Sculpt Layers

• The Export Layers As Blendshapes preference must be turned on for sculpt layers to be exported as blendshapes. Sculpt layers are converted to blend shape targets (Maya) or morph targets (3ds Max) when transferring between Mudbox and these 3D applications via FBX For more information, see FBX.
• Keep in mind that sculpt layers are locked to a specific subdivision level, so only the sculpt layers locked to the currently active subdivision level will be exported as blend shape targets. Any other sculpt layer information that exists on any other subdivision levels gets baked into the base mesh when exported using FBX and not exported as a blendshape.
• The Lock property on a sculpt layer is ignored by FBX.
• Any layer masking that exists in a Mudbox file is baked into the blend shape target/morph target when exported as an FBX file.
• When the Visibility property for a sculpt layer is turned off, the blend shape target’s weight is set as zero in the FBX file.
• Export layers as blendshapes works on selected faces.

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