You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: calcBinghamODF.m
    path of file: ./repos/mtex/geometry/@orientation
    
    the code of the file until where you have to start completion: function odf = calcBinghamODF(ori,varargin)
% calculate ODF from individuel orientations via kernel density estimation
%
% *calcODF* is one of the core function of the MTEX toolbox.
% It estimates an ODF from a set of individual crystal orientations by
% <EBSD2ODF.html kernel density estimation>.
%
% Input

    
function odf = calcBinghamODF(ori,varargin)
% calculate ODF from individuel orientations via kernel density estimation
%
% *calcODF* is one of the core function of the MTEX toolbox.
% It estimates an ODF from a set of individual crystal orientations by
% <EBSD2ODF.html kernel density estimation>.
%
% Input
%  ori  - @orientation
%
% Output
%  odf - @SO3Fun
%
% See also
% ebsd_demo EBSD2odf EBSDSimulation_demo EBSD/load EBSD/calcKernel kernel/kernel

% maybe there is nothing to do
if isempty(ori), odf = ODF; return, end