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Compatible Naming rules
During an export or a conversion to a Prefab Variant, if you enabled Compatible Naming in the Export Options, or in the Convert Options, the FBX Exporter manages characters in the names of the exported or converted elements to ensure naming compatibility with other software.
Character management in names
The Compatible Naming option manages characters as follows:
- Replaces invalid characters with underscores ("_"). Invalid characters are all non-alphanumeric characters, except for the colon (":").
- Adds an underscore ("_") to names that begin with a number.
- Replaces diacritics. For example, replaces "é" with "e".
Materials with a space in their name
If a Material has a space in its name, the FBX Exporter replaces this space by an underscore ("_") on export. As a result, if you re-import the same GameObject in Unity, the FBX Exporter creates a new Material based on the modified name.
For example, if the Material name is "Default Material", the FBX Exporter exports this Material as "Default_Material". After you re-import the same GameObject, you get twice the same material, respectively named "Default Material" and "Default_Material".
If you want to keep an exact match of Materials through your export/import iterations, you must rename the involved Materials to remove any space characters before exporting.