plot_trisurf triangles default value

[martinRenou]

Using plot_trisurf you apparently need to provide triangle indices for it to display something. Maybe it would make sense to set a default value to something like: np.arange(n_triangles * 3).reshape((n_triangles, 3)).

Better than that, instead of setting a default value Python side, it would be way more optimized to let it to None and use this default triangle indices value JavaScript side if triangle is null.

[martinRenou]

Actually it is the default ThreeJS behavior to use contiguous points for creating triangles automatically: https://threejs.org/docs/index.html#api/en/core/BufferGeometry.index, is there anything in the ipyvolume code that prevent this default from happening?