中文说明：现在三维模型被应用的很广泛，打印的也变多了，所以三维模型的版权保护也成了一个问题，那么在三维模型识别（版权保护）前，要对模型进行归一化操作，这样方便识别。本代码就是三维模型的形状归一化操作
English Description：
Now model is used very widely, print more, so three dimensional model of copyright protection is also a problem, then the model identification (copyright protection), normalized operation to model, to facilitate easy identification. This code is the three dimensional model of the shape of the normalized operation