Stabilize voxel boundary binning across platforms in VoxelGrid

src/pyntcloud/structures/voxelgrid.py

@@ -106,7 +106,11 @@ def compute(self):
         for i in range(3):
             # note the +1 in num
             s, step = np.linspace(
-                xyzmin[i], xyzmax[i], num=(self.x_y_z[i] + 1), retstep=True
+                float(xyzmin[i]),
+                float(xyzmax[i]),
+                num=(self.x_y_z[i] + 1),
+                retstep=True,
+                dtype=np.float64,
             )
             segments.append(s)
             shape.append(step)

tests/unit/structures/test_voxelgrid_structures.py

@@ -56,6 +56,13 @@ def test_sizes_override_number_of_voxels_per_axis(simple_pyntcloud):
     assert np.all(voxelgrid.voxel_n == [0, 0, 31, 62, 124, 124])
 
 
+def test_query_boundary_points_voxel_assignment(simple_pyntcloud):
+    voxelgrid = VoxelGrid(points=simple_pyntcloud.xyz, n_x=5, n_y=1, n_z=1)
+    voxelgrid.compute()
+    queried = voxelgrid.query(simple_pyntcloud.xyz[[0, 2, 5]])
+    assert np.all(queried == [0, 1, 4])
+
+
 @pytest.mark.parametrize(
     "x,y,z",
     [