Only update DLL path if not a PIP module

python/MaterialX/__init__.py

@@ -5,15 +5,19 @@
 # - https://docs.python.org/3.8/library/os.html#os.add_dll_directory
 import os
 import sys
+import importlib
 if sys.platform == "win32" and sys.version_info >= (3, 8):
-    # On a standard installation, this file is in %INSTALLDIR%\python\MaterialX
-    # We need to add %INSTALLDIR%\bin to the DLL path.
-    mxdir = os.path.dirname(__file__)
-    pydir = os.path.split(mxdir)[0]
-    installdir = os.path.split(pydir)[0]
-    bindir = os.path.join(installdir, "bin")
-    if os.path.exists(bindir):
-        os.add_dll_directory(bindir)
+    try:
+        importlib.metadata.version('MaterialX')
+    except importlib.metadata.PackageNotFoundError:
+        # On a non-pip installation, this file is in %INSTALLDIR%\python\MaterialX
+        # We need to add %INSTALLDIR%\bin to the DLL path.
+        mxdir = os.path.dirname(__file__)
+        pydir = os.path.split(mxdir)[0]
+        installdir = os.path.split(pydir)[0]
+        bindir = os.path.join(installdir, "bin")
+        if os.path.exists(bindir):
+            os.add_dll_directory(bindir)
 
 from .main import *
 from .colorspace import *