There is a potential issue for users using File>FBX Plug-in Import in releases of MotionBuilder prior to MotionBuilder 2011. Using FBX Plug-in Import will merge file to existing scene when imported in MotionBuilder 2010 or older, this may cause confusion whilst working. The issue has been resolved in MotionBuilder 2011 due to improvements around File handling as discussed in the solution section below.
An example workflow that would show the issue in MotionBuilder 2010 or older is below:-
You have existing MotionBuilder scene file opened from File>Open menu.
With existing scene opened, you have chosen File>FBX Plug-in Import to import an FBX file exported via FBX plugin for other application(i.e. 3ds Max/Maya)
Result: The imported FBX file is merged into the existing open scene file. User may expect that the scene would be cleared prior to import. The behavior is similar to using File>Merge to merge assets from FBX file to existing scene.
Note: there is an associated issue in re-saving scene file with File>Save after import of FBX. Using File>Save will in fact overwrite the FBX file that has been imported rather than overwriting the existing open scene.
This issue is only apparent when using File>FBX Plug-in Import to import FBX file in releases of MotionBuilder prior to MotionBuilder 2011. The issue is fully resolved in MotionBuilder 2011 due to the following feature enhancements-
FBX SDK 7.0 is now used as the mechanism to handle File I/0 in MotionBuilder 2011.
File>FBX Plug-in Import and File>FBX Plug-in Merge options have now been removed from the File menu in MotionBuilder. FBX files should now be opened from the File>Open or File>Merge menus.
The File I/O handling will now detect whether the FBX file being merged or opened is a native MotionBuilder FBX file or FBX file exported from FBX plugin. During load, the appropriate method will be employed.
To import or merge an exported FBX file to MotionBuilder 2011, simply use File>Open or File>Merge.
For users of MotionBuilder 2010 or older, please consider the following workarounds:-
Prior to importing FBX file via File>FBX Plug-in Import, choose File>New to clear the scene. This will ensure that resave of the FBX will not overwrite file with merged data.
If wishing to merge FBX file with currently open scene file, choose File>FBX Plug-in Merge instead of import. If using File>Save after importing with this method, the existing open scene file will be overwritten instead.
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