Merge pull request #146 from fusion-energy/default-to-gmsh-for-now

changed meshing_backend_back

Author: shimwell

src/cad_to_dagmc/core.py

@@ -855,15 +855,16 @@ def export_dagmc_h5m_file(
             umesh_filename: the filename to use for the optional unstructured
                 mesh file. Only used if unstructured_volumes is not empty.
             meshing_backend: determines whether gmsh or cadquery's direct mesh method
-                is used for meshing.
+                is used for meshing. Options are 'gmsh' or 'cadquery'. Defaults
+                to 'gmsh'.
 
         Returns:
             str: the filenames(s) for the files created.
         """
 
         # Check to make sure an invalid combination of mesher backend and surface vs volume mesh has not been chosen
         if unstructured_volumes != None and meshing_backend == "cadquery":
-            raise(ValueError, "CadQuery direct meshing backend cannot be used for volume meshing.")
+            raise (ValueError, "CadQuery direct meshing backend cannot be used for volume meshing.")
 
         assembly = cq.Assembly()
         for part in self.parts:
@@ -902,7 +903,7 @@ def export_dagmc_h5m_file(
             vertices = cq_mesh["vertices"]
             triangles_by_solid_by_face = cq_mesh["solid_face_triangle_vertex_map"]
         # Use gmsh
-        else:
+        elif meshing_backend == "gmsh":
             # If assembly is not to be imprinted, pass through the assembly as-is
             if imprint:
                 imprinted_assembly, imprinted_solids_with_org_id = cq.occ_impl.assembly.imprint(
@@ -942,6 +943,11 @@ def export_dagmc_h5m_file(
                 dims_and_vol_ids=volumes
             )
 
+        else:
+            raise ValueError(
+                f'meshing_backend {meshing_backend} not supported. Available options are "cadquery" or "gmsh"'
+            )
+
         dagmc_filename = vertices_to_h5m(
             vertices=vertices,
             triangles_by_solid_by_face=triangles_by_solid_by_face,