tfields.Mesh3D cutting works - except for templates on fields

tfields/core.py

@@ -388,6 +388,9 @@ class Tensors(AbstractNdarray):
                 tensors = np.empty(tensors.shape, dtype=tensors.dtype)
             elif dim is not None:
                 tensors = np.empty((0, dim))
+            if issubclass(type(tensors), np.ndarray):
+                # np.empty
+                pass
             else:
                 raise ValueError("Empty tensors need dimension "
                                  "parameter 'dim'.")
@@ -1454,10 +1457,11 @@ class TensorMaps(TensorFields):
                     dims.append(map_field.dim)
                 else:
                     maps[mp_idx] = TensorFields.merged(maps[mp_idx], map_field)
-        kwargs['maps'] = maps
+        # kwargs['maps'] = maps
 
-        obj = super(TensorMaps, cls).merged(*objects, **kwargs) 
-        return cls.__new__(cls, obj, maps=maps)
+        inst = super(TensorMaps, cls).merged(*objects, **kwargs)
+        inst = cls.__new__(cls, inst, maps=maps)
+        return inst
 
     def equal(self, other, **kwargs):
         """

tfields/lib/__init__.py

@@ -108,3 +108,4 @@ else:
     from .grid import igrid
     from . import stats
     from .stats import mode, median, mean
+    from . import symbolics