def test_get_weight_and_index_center_even():
"""Test get_weight_and_index centering for even-sized meshes."""
pixel_position = xp.zeros((1,3), dtype=float)
voxel_length = 1.
voxel_num_1d = 4
index, weight = mapping.get_weight_and_index(
pixel_position, voxel_length, voxel_num_1d)
assert xp.all(index[0][0] == xp.array([1, 1, 1]))
assert xp.allclose(weight[0], 0.125)
def test_get_weight_and_index_center_odd():
"""Test get_weight_and_index centering for odd-sized meshes."""
pixel_position = xp.zeros((1,3), dtype=float)
voxel_length = 1.
voxel_num_1d = 5
index, weight = mapping.get_weight_and_index(
pixel_position, voxel_length, voxel_num_1d)
assert xp.all(index[0][0] == xp.array([2, 2, 2]))
assert weight[0][0] == 1
assert xp.all(weight[0][1:] == 0)
def test_get_weight_and_index_off_center():
"""Test get_weight_and_index for off-centered points."""
pixel_position = xp.array([[0.1, 0.2, 0.3]])
voxel_length = 2.
voxel_num_1d = 5
index, weight = mapping.get_weight_and_index(
pixel_position, voxel_length, voxel_num_1d)
assert xp.all(index[0][0] == xp.array([2, 2, 2]))
assert xp.isclose(weight.sum(), 1.)
assert xp.allclose(xp.dot(weight[0], index[0]),
xp.array([ 2.05, 2.1 , 2.15]))