Autodesk Mudbox 2013 SDK Documentation > Writing Plug-ins >

# Mesh Importer and Exporter Plug-ins

Mesh importer and exporter plug-ins derive from one of the following classes:

- Importer - the base class for plug-ins that import geometry into Mudbox.
- Exporter - the base class for plug-ins that export mesh geometry from Mudbox.

For an example of writing mesh importers and exporters see the PLYImport sample which demonstrates an importer and exporter for the .PLY 3d file format, and STLExport which demonstrates an exporter for the binary .STL file format.