I have changed the x file exporter.
Now, it is using the material settings of each surface for textured objects, too.
The new version ( v1.9 ) can be loaded from :
www.frank-meinert.de/ac3d/directx.zip
The ZIP file contains the files 'DirectX.p' and 'DirectX.tcl' which must be copied into the AC3D plugin directory.
Very important :
Because the name of the plugin was changed as of this version, the old plugin files must be deleted manually !
( 'xdx_export.p', 'xdx_export.tcl' and 'xdx_export.opt' found in the AC3D plugin directory. )
Frank