Repository: mikedh/trimesh

Issue:
The uv attribute is not well handled in ply exporter
Hi, thanks for the great library.

An issue is found when exporting a mesh to ply. When the `mesh.visual.uv` is `None`, direct access to `mesh.visual.uv[:, 0]` and `mesh.visual.uv[:, 1]` will raise an error.

https://github.com/mikedh/trimesh/blob/021af1fedb3c6cff0e42cba9eed140eea7f819e3/trimesh/exchange/ply.py#L265-L271

I think only using the `hasattr` to check the existence of attributes is not enough, additional not-None checks should be considered, since other exporters have handled this correctly as following.

https://github.com/mikedh/trimesh/blob/021af1fedb3c6cff0e42cba9eed140eea7f819e3/trimesh/exchange/obj.py#L887-L889


Discussion:

Patch:
diff --git a/README.md b/README.md
index f5f921309..b4a1e760a 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Keeping `trimesh` easy to install is a core goal, thus the *only* hard dependenc
 pip install trimesh
 ```
 
-The minimal install can load many supported formats (STL, PLY, GLTF/GLB) into numpy arrays. More functionality is available when soft dependencies are installed. This includes things like convex hulls (`scipy`), graph operations (`networkx`), faster ray queries (`pyembree`), vector path handling (`shapely` and `rtree`), XML formats like 3DXML/XAML/3MF (`lxml`), preview windows (`pyglet`), faster cache checks (`xxhash`), etc. To install `trimesh` with the soft dependencies that generally install cleanly on Linux, OSX, and Windows using `pip`:
+The minimal install can load many supported formats (STL, PLY, GLTF/GLB) into numpy arrays. More functionality is available when soft dependencies are installed. This includes things like convex hulls (`scipy`), graph operations (`networkx`), faster ray queries (`embreex`), vector path handling (`shapely` and `rtree`), XML formats like 3DXML/XAML/3MF (`lxml`), preview windows (`pyglet`), faster cache checks (`xxhash`), etc. To install `trimesh` with the soft dependencies that generally install cleanly on Linux, OSX, and Windows using `pip`:
 ```bash
 pip install trimesh[easy]
 ```
diff --git a/pyproject.toml b/pyproject.toml
index 0c5e9e5ac..acdcf1b32 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ requires = ["setuptools >= 61.0", "wheel"]
 [project]
 name = "trimesh"
 requires-python = ">=3.7"
-version = "4.1.1"
+version = "4.1.2"
 authors = [{name = "Michael Dawson-Haggerty", email = "mikedh@kerfed.com"}]
 license = {file = "LICENSE.md"}
 description = "Import, export, process, analyze and view triangular meshes."
diff --git a/trimesh/exchange/ply.py b/trimesh/exchange/ply.py
index 389d2f10b..1fdb263c8 100644
--- a/trimesh/exchange/ply.py
+++ b/trimesh/exchange/ply.py
@@ -266,7 +266,11 @@ def export_ply(
     if include_attributes:
         if hasattr(mesh, "vertex_attributes"):
             # make sure to export texture coordinates as well
-            if hasattr(mesh, "visual") and hasattr(mesh.visual, "uv"):
+            if (
+                hasattr(mesh, "visual")
+                and hasattr(mesh.visual, "uv")
+                and np.shape(mesh.visual.uv) == (len(mesh.vertices), 2)
+            ):
                 mesh.vertex_attributes["s"] = mesh.visual.uv[:, 0]
                 mesh.vertex_attributes["t"] = mesh.visual.uv[:, 1]
             _assert_attributes_valid(mesh.vertex_attributes)
diff --git a/trimesh/util.py b/trimesh/util.py
index 14e752e6c..e0db1992d 100644
--- a/trimesh/util.py
+++ b/trimesh/util.py
@@ -17,8 +17,10 @@
 import logging
 import random
 import shutil
+import sys
 import time
 import uuid
+import warnings
 import zipfile
 
 # for type checking
@@ -48,7 +50,7 @@
 _IDENTITY.flags["WRITEABLE"] = False
 
 
-def has_module(name):
+def has_module(name: str) -> bool:
     """
     Check to see if a module is installed by name without
     actually importing the module.
@@ -63,28 +65,14 @@ def has_module(name):
     installed : bool
       True if module is installed
     """
-    # this should work on Python 2.7 and 3.4+
-    import pkgutil
-
-    return pkgutil.find_loader(name) is not None
-
-
-try:
-    import rtree
+    if sys.version_info >= (3, 10):
+        # pkgutil was deprecated
+        from importlib.util import find_spec
+    else:
+        # this should work on Python 2.7 and 3.4+
+        from pkgutil import find_loader as find_spec
 
-    # some versions of rtree screw up indexes on stream loading
-    # do a test here so we know if we are free to use stream loading
-    assert (
-        next(
-            rtree.index.Index(
-                [(1564, [0, 0, 0, 10, 10, 10], None)],
-                properties=rtree.index.Property(dimension=3),
-            ).intersection([1, 1, 1, 2, 2, 2])
-        )
-        == 1564
-    )
-except BaseException as E:
-    rtree = E
+    return find_spec(name) is not None
 
 
 def unitize(vectors, check_valid=False, threshold=None):
@@ -142,22 +130,18 @@ def unitize(vectors, check_valid=False, threshold=None):
     return unit
 
 
-def euclidean(a, b):
+def euclidean(a, b) -> float:
     """
-    Euclidean distance between vectors a and b.
-
-    Parameters
-    ------------
-    a : (n,) float
-       First vector
-    b : (n,) float
-       Second vector
-
-    Returns
-    ------------
-    distance : float
-        Euclidean distance between A and B
+    DEPRECATED: use `np.linalg.norm(a - b)` instead of this.
     """
+    warnings.warn(
+        "`trimesh.util.euclidean` is deprecated "
+        + "and will be removed in January 2025. "
+        + "replace with `np.linalg.norm(a - b)`",
+        category=DeprecationWarning,
+        stacklevel=2,
+    )
+
     a = np.asanyarray(a, dtype=np.float64)
     b = np.asanyarray(b, dtype=np.float64)
     return np.sqrt(((a - b) ** 2).sum())
@@ -199,7 +183,7 @@ def is_pathlib(obj):
     return hasattr(obj, "absolute") and name.endswith("Path")
 
 
-def is_string(obj):
+def is_string(obj) -> bool:
     """
     Check if an object is a string.
 
@@ -216,7 +200,7 @@ def is_string(obj):
     return isinstance(obj, str)
 
 
-def is_none(obj):
+def is_none(obj) -> bool:
     """
     Check to see if an object is None or not.
 
@@ -239,7 +223,7 @@ def is_none(obj):
     return False
 
 
-def is_sequence(obj):
+def is_sequence(obj) -> bool:
     """
     Check if an object is a sequence or not.
 
@@ -1765,6 +1749,8 @@ def bounds_tree(bounds):
     tree : Rtree
       Tree containing bounds by index
     """
+    import rtree
+
     # make sure we've copied bounds
     bounds = np.array(bounds, dtype=np.float64, copy=True)
     if len(bounds.shape) == 3:


Test patch:
diff --git a/tests/generic.py b/tests/generic.py
index a9466c32f..b3fa46fc7 100644
--- a/tests/generic.py
+++ b/tests/generic.py
@@ -351,7 +351,7 @@ def check(item):
                 loaded = trimesh.load(os.path.join(dir_models, file_name))
             except BaseException as E:
                 if raise_error:
-                    log.error(f'failed to load {file_name}')
+                    log.error(f"failed to load {file_name}")
                     raise E
                 continue
 
diff --git a/tests/test_arc.py b/tests/test_arc.py
index ac7d973b4..64905c1bc 100644
--- a/tests/test_arc.py
+++ b/tests/test_arc.py
@@ -21,7 +21,7 @@ def test_center(self):
         )
 
         assert abs(R - res_radius) < g.tol_path.zero
-        assert g.trimesh.util.euclidean(C, res_center) < g.tol_path.zero
+        assert g.np.linalg.norm(C - res_center) < g.tol_path.zero
         # large magnitude arc failed some coplanar tests
         c = g.trimesh.path.arc.arc_center(
             [
diff --git a/tests/test_export.py b/tests/test_export.py
index a8707834d..a18565a2b 100644
--- a/tests/test_export.py
+++ b/tests/test_export.py
@@ -16,7 +16,7 @@ def test_export(self):
             if not isinstance(v, ExceptionWrapper)
         }
 
-        meshes = list(g.get_meshes(8))
+        meshes = list(g.get_meshes(10))
         # make sure we've got something with texture
         meshes.append(g.get_mesh("fuze.obj"))
 
@@ -36,6 +36,11 @@ def test_export(self):
                         "No data exported %s to %s", mesh.metadata["file_name"], file_type
                     )
 
+                if mesh.visual.kind == "texture":
+                    c = mesh.copy()
+                    c.visual.uv = None
+                    c.export(file_type=file_type)
+
                 if file_type in [
                     "dae",  # collada, no native importers
                     "collada",  # collada, no native importers
diff --git a/tests/test_paths.py b/tests/test_paths.py
index bbbe84d10..1230e4cc1 100644
--- a/tests/test_paths.py
+++ b/tests/test_paths.py
@@ -54,7 +54,7 @@ def test_discrete(self):
                         "{} had zero distance in discrete!", d.metadata["file_name"]
                     )
 
-                circuit_dist = g.trimesh.util.euclidean(verts[0], verts[-1])
+                circuit_dist = g.np.linalg.norm(verts[0] - verts[-1])
                 circuit_test = circuit_dist < g.tol_path.merge
                 if not circuit_test:
                     g.log.error(