Hello 永伦 刘,
As per my understanding, you are trying to use the GL Transmission Format for MATLAB Version 1.3.0.0 by Rohan Chabukswar, which is available on MATLAB file exchange. I tried to run the code on my end and faced the same issue as you had reported. I resolved it by creating a class folder. Since, the functions are defined in individual files, I made a class folder named @GLTF and transferred all the files of the class to it.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1358563/image.png)
You may read more about class folders at : https://www.mathworks.com/help/matlab/matlab_oop/organizing-classes-in-folders.html#bulhd5h-1.
Note: For any specific questions pertaining to how the GLTF class works, we urge you to contact the author of the GL Transmission Format for MATLAB Version 1.3.0.0 directly, since the MATLAB File exchange is a public forum for users to share their custom-coded programs without any involvement from Mathworks.
Hope this helps!