Issue:

You open a Maya scene file containing several elements, but the scene is empty. All the geometry is missing.
Nothing is displayed in the Outliner or in the Node Editor, but the file size is still bigger than the size of an empty file scene.

Causes:

The file contains several invalid values (“nan” = Not a Number).  Most “nan” values are caused by values becoming too large, for example positioning something outside of the valid range of a scene or feeding an invalid output from one node into an other node.

Solution:

This can be corrected manually with a text editor:

  • Open the Maya scene file with a text editor.
  • Replace all text “nan” or “nan(ind)” with “0”.
  • Save the file using a different file name.
  • The scene should now open correctly.

Source: Autodesk

Refer to some related articles:
Maya crashes on MacOS Mojave
How to reverse normals in Maya on a large scale after importing?
How to improve render times with Arnold and Maya

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