minor fix bloch validator

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Error in `CustomSourceTime` when evaluating at a list of times entirely outside of the range of the envelope definition times.
 - Improved passivity enforcement near high-Q poles in `FastDispersionFitter`. Failed passivity enforcement could lead to simulation divergences.
 - More helpful error and suggestion if users try to differentiate w.r.t. unsupported `FluxMonitor` output.
+- Removed positive warnings in Simulation validators for Bloch boundary conditions.
 
 ## [2.7.2] - 2024-08-07
 

tests/test_components/test_simulation.py

@@ -423,6 +423,14 @@ def test_validate_plane_wave_boundaries(log_capture):
         angle_theta=np.pi / 4,
     )
 
+    mnt = td.DiffractionMonitor(
+        center=(0, 0, 0),
+        size=(td.inf, td.inf, 0),
+        freqs=[250e12, 300e12],
+        name="monitor_diffraction",
+        normal_dir="+",
+    )
+
     bspec1 = td.BoundarySpec(
         x=td.Boundary.pml(),
         y=td.Boundary.absorber(),
@@ -480,6 +488,7 @@ def test_validate_plane_wave_boundaries(log_capture):
             run_time=1e-12,
             sources=[src2],
             boundary_spec=bspec3,
+            monitors=[mnt],
         )
 
     # angled incidence plane wave with wrong Bloch vector should warn

tidy3d/components/simulation.py

@@ -2323,6 +2323,46 @@ def plane_wave_boundaries(cls, val, values):
                     )
         return val
 
+    @pydantic.validator("monitors", always=True)
+    @skip_if_fields_missing(["boundary_spec", "medium", "size", "structures", "sources"])
+    def bloch_boundaries_diff_mnt(cls, val, values):
+        """Error if there are diffraction monitors incompatible with boundary conditions."""
+
+        monitors = val
+
+        if not val or not any(isinstance(mnt, DiffractionMonitor) for mnt in monitors):
+            return val
+
+        boundaries = values.get("boundary_spec").to_list
+        sources = values.get("sources")
+        size = values.get("size")
+        sim_medium = values.get("medium")
+        structures = values.get("structures")
+        for source_ind, source in enumerate(sources):
+            if not isinstance(source, PlaneWave):
+                continue
+
+            _, tan_dirs = cls.pop_axis([0, 1, 2], axis=source.injection_axis)
+            medium_set = Scene.intersecting_media(source, structures)
+            medium = medium_set.pop() if medium_set else sim_medium
+
+            for tan_dir in tan_dirs:
+                boundary = boundaries[tan_dir]
+
+                # check the Bloch boundary + angled plane wave case
+                num_bloch = sum(isinstance(bnd, (Periodic, BlochBoundary)) for bnd in boundary)
+                if num_bloch > 0:
+                    cls._check_bloch_vec(
+                        source=source,
+                        source_ind=source_ind,
+                        bloch_vec=boundary[0].bloch_vec,
+                        dim=tan_dir,
+                        medium=medium,
+                        domain_size=size[tan_dir],
+                        has_diff_mnt=True,
+                    )
+        return val
+
     @pydantic.validator("boundary_spec", always=True)
     @skip_if_fields_missing(["medium", "center", "size", "structures", "sources"])
     def tfsf_boundaries(cls, val, values):
@@ -3774,6 +3814,7 @@ def _check_bloch_vec(
         dim: Axis,
         medium: MediumType,
         domain_size: float,
+        has_diff_mnt: bool = False,
     ):
         """Helper to check if a given Bloch vector is consistent with a given source."""
 
@@ -3786,23 +3827,27 @@ def _check_bloch_vec(
         if bloch_vec != expected_bloch_vec:
             test_val = np.real(expected_bloch_vec - bloch_vec)
 
-            if np.isclose(test_val % 1, 0) and not np.isclose(test_val, 0):
+            test_val_is_int = np.isclose(test_val, np.round(test_val))
+            src_name = f" '{source.name}'" if source.name else ""
+
+            if has_diff_mnt and test_val_is_int and not np.isclose(test_val, 0):
                 # the given Bloch vector is offset by an integer
                 log.warning(
-                    f"The wave vector of source '{source.name}' along dimension "
+                    f"The wave vector of source{src_name} along dimension "
                     f"'{dim}' is equal to the Bloch vector of the simulation "
                     "boundaries along that dimension plus an integer reciprocal "
                     "lattice vector. If using a 'DiffractionMonitor', diffraction "
                     "order 0 will not correspond to the angle of propagation "
                     "of the source. Consider using 'BlochBoundary.from_source()'.",
                     custom_loc=["boundary_spec", "xyz"[dim]],
                 )
-            elif not np.isclose(test_val % 1, 0):
+
+            if not test_val_is_int:
                 # the given Bloch vector is neither equal to the expected value, nor
                 # off by an integer
                 log.warning(
                     f"The Bloch vector along dimension '{dim}' may be incorrectly "
-                    f"set with respect to the source '{source.name}'. The absolute "
+                    f"set with respect to the source{src_name}. The absolute "
                     "difference between the expected and provided values in "
                     "bandstructure units, up to an integer offset, is greater than "
                     "1e-6. Consider using ``BlochBoundary.from_source()``, or "