getting rid of delaunay

pyproject.toml

@@ -39,15 +39,16 @@ license = { file = "LICENSE" }
 requires-python = ">=3.7"
 dependencies = [
     "numpy ~= 1.24",
-    "scipy ~= 1.10",
-    "mfem ~= 4.6.1.0",
+    "scipy ~= 1.11.3",
+    "mfem ~= 4.7.0.1",
     "scikit-learn ~= 1.4",
     "tqdm ~= 4.66",
     "pyvista ~= 0.43",
     "pandas ~= 2.0",
     "nibabel ~= 5.1.0",
     "numba ~= 0.59.1",
     "scikit-image ~= 0.24.0",
+    "meshio ~= 2.3.5",
     # "dolfin",
     # "meshio",
     # "snakemake",

src/kesi/fem_utils/pyvista_resampling.py

@@ -1,6 +1,8 @@
 import argparse
 import glob
 import os
+import tempfile
+from io import StringIO
 
 import nibabel
 import numpy as np
@@ -11,6 +13,70 @@
 from tqdm import tqdm
 
 from kesi.fem_utils.grid_utils import load_or_create_grid
+import mfem.ser as mfem
+
+from kesi.mfem_solver.mfem_piecewise_solver import prepare_fespace
+
+
+
+def convert_mfem_to_pyvista(mesh, solutions, names):
+    """
+    mesh - mfem mesh object
+    solutions - list gridfunctions
+    names - list of gridfunction names to use
+    """
+
+    assert len(solutions) == len(names)
+    with tempfile.NamedTemporaryFile(suffix='.vtk') as fp:
+        output = StringIO()
+        print("saving output mesh")
+        mesh.PrintVTK(output, 0)
+        with open(fp.name, 'a') as vtk_file:
+            vtk_file.write(output.getvalue())
+        del output
+
+        fespace = prepare_fespace(mesh)
+        x = mfem.GridFunction(fespace)
+        # setting initial values in all points, boundary elements will enforce this  value
+        for name, sol in zip(names, solutions):
+            output = StringIO()
+
+            x.Assign(sol.GetDataArray())
+            x.SaveVTK(output, name, 0)  # this crashes when using passed solutions, missing fespace???
+
+            with open(fp.name, 'a') as vtk_file:
+                vtk_file.write(output.getvalue())
+            del output
+
+        pyvista_mesh = pyvista.read(fp.name)
+    return pyvista_mesh
+
+
+def pyvista_sample_points(pyvista_mesh, points):
+    point_cloud = pyvista.PolyData(points)
+    sampled = point_cloud.sample(pyvista_mesh, progress_bar=True, snap_to_closest_point=True)
+    return sampled
+
+
+def pyvista_sample_grid(pyvista_mesh, grid):
+    """
+    grid - meshgrid [x, y, z, 3]
+    """
+    dimensions = grid.shape[0:4]
+    spacing = [
+        grid[1, 0, 0, 0] - grid[0, 0, 0, 0],
+        grid[0, 1, 0, 1] - grid[0, 0, 0, 1],
+        grid[0, 0, 1, 2] - grid[0, 0, 0, 2],
+
+    ]
+    origin = [grid[0, 0, 0, 0], grid[0, 0, 0, 1], grid[0, 0, 0, 2]]
+
+    str_grid = pyvista.ImageData(dimensions=dimensions,
+                                 spacing=spacing,
+                                 origin=origin
+                                 )
+    sampled = str_grid.sample(pyvista_mesh, progress_bar=True, snap_to_closest_point=True)
+    return sampled
 
 
 def main():

src/kesi/mfem_solver/forward_solver.py

@@ -4,6 +4,7 @@
 from scipy.interpolate import LinearNDInterpolator
 from scipy.spatial import Delaunay
 
+from kesi.fem_utils.pyvista_resampling import convert_mfem_to_pyvista, pyvista_sample_points, pyvista_sample_grid
 from kesi.mfem_solver.mfem_piecewise_solver import mfem_solve_mesh, csd_distribution_coefficient, prepare_mesh
 
 
@@ -53,11 +54,7 @@ def solve_coeff(self, coeff):
                                    conductivities=self.conductivities)
         self.solution = solution
 
-        verts = np.array(self.mesh.GetVertexArray())
-        sol = self.solution.GetDataArray()
-        verts_triangulation = cachedDelaunay(verts)
-
-        self.solution_interpolated = self.interpolator(verts_triangulation, sol)
+        self.pyvista_mesh_solution = convert_mfem_to_pyvista(self.mesh, [solution], ["pot"])
         return solution
 
     def solve(self, xyz, csd):
@@ -67,12 +64,21 @@ def solve(self, xyz, csd):
         coeff = csd_distribution_coefficient(xyz, csd)
         return self.solve_coeff(coeff)
 
-
     def sample_solution_probe(self, x, y, z):
-        return self.solution_interpolated([x, y, z])[0]
+        points = np.array([[x, y, z]])
+        cloud = self.sample_solution(points)
+        return cloud.get_array("pot")
 
     def sample_solution(self, positions):
-        """positions - array (N, 3)"""
-        assert self.solution_interpolated is not None
-        pos_arr = np.array(positions)
-        return self.solution_interpolated(pos_arr)
+        """positions - array (N, 3) or meshgrid stack [X, Y, Z, 3]"""
+
+        cloud = pyvista_sample_points(self.pyvista_mesh_solution, positions)
+        data = cloud.get_array("pot")
+        return data
+
+    def sample_grid(self, grid):
+        sampled = pyvista_sample_grid(self.pyvista_mesh_solution, grid)
+        data = sampled.get_array("pot")
+        sampled_grid = data.reshape(grid.shape[0:3], order="F")
+        return sampled_grid
+

src/kesi/mfem_solver/mfem_piecewise_solver.py

@@ -122,6 +122,7 @@ def mfem_solve_mesh(csd_coefficient, mesh, boundary_potential, conductivities):
     b = mfem.LinearForm(fespace)
 
     conductivities_vector = mfem.Vector(list(1.0 / (4 * np.pi * conductivities)))
+    # conductivities_vector = mfem.Vector(list(conductivities))
 
     conductivities_coeff = mfem.PWConstCoefficient(conductivities_vector)