rebase fixes

Author: dbochkov-flexcompute

tidy3d/components/data/monitor_data.py

@@ -1464,10 +1464,11 @@ def normalize(self, source_spectrum_fn: Callable[[float], complex]) -> FieldData
         for field_name, field_data in self.field_components.items():
             fields_norm[field_name] = [None, None]
             for ind in range(2):
-                src_amps = source_spectrum_fn(field_data[ind].values.f)
-                fields_norm[field_name][ind] = field_data[ind].updated_copy(
-                    values=(field_data[ind].values / src_amps).astype(field_data[ind].values.dtype)
-                )
+                if field_data[ind] is not None:
+                    src_amps = source_spectrum_fn(field_data[ind].values.f)
+                    fields_norm[field_name][ind] = field_data[ind].updated_copy(
+                        values=(field_data[ind].values / src_amps).astype(field_data[ind].values.dtype)
+                    )
 
         return self.copy(update=fields_norm)
 

tidy3d/components/data/unstructured/surface.py

@@ -176,6 +176,14 @@ def sel(
             raise Tidy3dNotImplementedError("Surface datasets do not support selection along x, y, or z yet.")
 
         return self._non_spatial_sel(method=method, **sel_kwargs)
+    
+    def get_cell_volumes(self):
+        """Get areas associated to each cell of the grid."""
+        v0 = self.points[self.cells.sel(vertex_index=0)]
+        e01 = self.points[self.cells.sel(vertex_index=1)] - v0
+        e02 = self.points[self.cells.sel(vertex_index=2)] - v0
+
+        return 0.5 * np.abs(np.cross(e01, e02))
 
 
     """ Plotting """