feat(objects): mesh transform helper

specklepy/objects/base.py

@@ -252,9 +252,6 @@ class Base(_RegisteringBase):
         if t is None:
             return value
 
-        if value is None:
-            return None
-
         if t.__module__ == "typing":
             origin = getattr(t, "__origin__")
             t = (
@@ -313,9 +310,7 @@ class Base(_RegisteringBase):
 
     @units.setter
     def units(self, value: str):
-        units = get_units_from_string(value)
-        if units:
-            self._units = units
+        self._units = get_units_from_string(value)
 
     def get_member_names(self) -> List[str]:
         """Get all of the property names on this object, dynamic or not"""

specklepy/objects/geometry.py

@@ -391,6 +391,15 @@ class Mesh(
     area: float = None
     volume: float = None
 
+    def transform_to(self, transform: "Transform") -> "Mesh":
+        mesh = Mesh(vertices=transform.apply_to_points_values(self.vertices))
+        for attr in set(self.get_serializable_attributes()) - {"vertices"}:
+            orig_val = getattr(self, attr, None)
+            if orig_val:
+                setattr(mesh, attr, orig_val)
+
+        return mesh
+
 
 class Surface(Base, speckle_type=GEOMETRY + "Surface"):
     degreeU: int = None

specklepy/objects/units.py

@@ -1,5 +1,4 @@
-from warnings import warn
-from specklepy.logging.exceptions import SpeckleException, SpeckleWarning
+from specklepy.logging.exceptions import SpeckleException
 
 UNITS = ["mm", "cm", "m", "in", "ft", "yd", "mi"]
 
@@ -29,12 +28,6 @@ UNITS_ENCODINGS = {
 
 
 def get_units_from_string(unit: str):
-    if not isinstance(unit, str):
-        warn(
-            f"Invalid units: expected type str but received {type(unit)} ({unit}). Skipping - no units will be set.",
-            SpeckleWarning,
-        )
-        return
     unit = str.lower(unit)
     for name, alternates in UNITS_STRINGS.items():
         if unit in alternates:

specklepy/serialization/base_object_serializer.py

@@ -60,19 +60,14 @@ class BaseObjectSerializer:
             chunkable = False
             detach = False
 
-            # skip props marked to be ignored with "__" or "_"
-            if prop.startswith(("__", "_")):
+            # skip nulls or props marked to be ignored with "__" or "_"
+            if value is None or prop.startswith(("__", "_")):
                 continue
 
             # don't prepopulate id as this will mess up hashing
             if prop == "id":
                 continue
 
-            # allow serialisation of nulls
-            if value is None:
-                object_builder[prop] = value
-                continue
-
             # only bother with chunking and detaching if there is a write transport
             if self.write_transports:
                 dynamic_chunk_match = prop.startswith("@") and re.match(

tests/test_base.py

@@ -77,18 +77,6 @@ def test_speckle_type_cannot_be_set(base: Base) -> None:
     assert base.speckle_type == "Base"
 
 
-def test_setting_units():
-    b = Base(units="foot")
-    assert b.units == "ft"
-
-    with pytest.raises(SpeckleException):
-        b.units = "big"
-
-    b.units = None  # invalid args are skipped
-    b.units = 7
-    assert b.units == "ft"
-
-
 def test_base_of_custom_speckle_type() -> None:
     b1 = Base.of_type("BirdHouse", name="Tweety's Crib")
     assert b1.speckle_type == "BirdHouse"

tests/test_transforms.py

@@ -1,7 +1,7 @@
 from typing import List
 import pytest
 from specklepy.api import operations
-from specklepy.objects.geometry import Point, Vector
+from specklepy.objects.geometry import Mesh, Point, Vector
 from specklepy.objects.other import (
     Transform,
     BlockInstance,
@@ -43,6 +43,15 @@ def vector_value():
     return [1, 1, 2]
 
 
+@pytest.fixture()
+def mesh():
+    return Mesh(
+        vertices=[-7, 5, 1, -8, 4, 0, -7, 3, 0, -6, 4, 0],
+        faces=[1, 1, 2, 3, 0],
+        units="feet",
+    )
+
+
 @pytest.fixture()
 def transform():
     """Translates to [1, 2, 0] and scales z by 0.5"""
@@ -129,4 +138,14 @@ def test_transform_serialisation(transform: Transform):
     serialized = operations.serialize(transform)
     deserialized = operations.deserialize(serialized)
 
-    assert transform.get_id() == deserialized.get_id()
+    assert transform.get_id() == deserialized.get_id()
+
+
+def test_mesh_transform(mesh: Mesh, transform: Transform):
+    new_mesh = mesh.transform_to(transform)
+
+    assert mesh.vertices != new_mesh.vertices
+
+    new_mesh.vertices = mesh.vertices
+
+    assert mesh.get_id() == new_mesh.get_id()