making h5m files with h5py about vertices_to_h5m HOT 4 OPEN

Alternatively, h5py routines could be written into this package to take the vertices and triangles and write them directly to h5m files.

Perhaps something like this is a starting point

import numpy as np
import h5py

vertices = np.array(
    [
        [0.0, 0.0, 0.0],
        [1.0, 0.0, 0.0],
        [0.0, 1.0, 0.0],
        [0.0, 0.0, 1.0],
    ]
)


triangles = [
    np.array([[0, 1, 2], [3, 1, 2], [0, 2, 3], [0, 1, 3]]),
]



f = h5py.File("one_volume.h5m", "w")

tstt = f.create_group("tstt")

elements = tstt.create_group("elements")

nodes = tstt.create_group("nodes")

coords = nodes.create_dataset("coordinates", data=vertices)

sets = tstt.create_group("sets")

tags = tstt.create_group("tags")

from vertices_to_h5m.

To test the resulting h5m file works in openmc I have a few test cases as part of the CI that will check that the material tags are visible to DAGMC and that neutrons can be transported through the geometry. So any solution to this issue can be tested against these test cases

from vertices_to_h5m.

h5view can be used to see the contents of the h5 file

from vertices_to_h5m.

just to note the triangle sets need tagging with a string that is encoded. here is an example of decoding https://github.com/openmc-dev/openmc/blob/dff3ad48f1e9f7f3bc9cb74675613d1ae3d8bb60/openmc/universe.py#L717-L728

from vertices_to_h5m.