Expose boundary interpolation settings to GDScript

[nkrisc]

Doesn’t seem to be currently possible, but it would be nice to be able to change the boundary interpolation setting used during subdivision.

https://graphics.pixar.com/opensubdiv/docs/subdivision_surfaces.html#boundary-interpolation-rules

[tefusion]

Sorry for the late response, not using godot that often lately. I added SubdivRefinerOptions which expose the boundary interpolation options in the Subdivider in gdscript on the dev branch (not on the nodes though, I can add that as well if you need it).

You can download it from Github Actions: artifact from workflow run.