Description:
If this object is associated with a document, this gets the document dithering. If this object is associated with a File3dm, this gets the File3dm's dithering. Otherwise it gets a 'free-floating' dithering object.
If this object is associated with a document, this gets the document dithering. If this object is associated with a File3dm, this gets the File3dm's dithering. Otherwise it gets a 'free-floating' dithering object.