${__BASE_PATH__} is used in our code base so when deployed on github.io we can add /vtk-js/. For you, you just need to provide a URL that your server is serving your data on…
Then the undefined part, it is most likely related to your build system and how you configured your loader.
But normally, none of that should really matter since the example is just showing you how to interact with the vtk.js classes and instances. The rest, especially if you are using Vue should be straight forward for you.
Thank you.
I tried local url.
But It said “not Not allowed to load local resource:”
That means URL is only for server?
Then, how I can load local file?