scripts/modules/bpy_hydra.py

@@ -64,17 +64,6 @@ class HydraRenderEngine(bpy.types.RenderEngine):
 
         _bpy_hydra.engine_free(self.engine_ptr)
 
-    @classmethod
-    def register(cls):
-        root_folder = "blender.shared" if platform.system() == 'Windows' else "lib"
-        os.environ['PXR_MTLX_STDLIB_SEARCH_PATHS'] = os.pathsep.join([
-            str(Path(bpy.app.binary_path).parent / f"{root_folder}/materialx/libraries"),
-            os.environ.get('PXR_MTLX_STDLIB_SEARCH_PATHS', "")])
-
-    @classmethod
-    def unregister(cls):
-        pass
-
     def get_sync_settings(self, engine_type):
         """
         Provide settings for Blender scene delegate. Available settings:

scripts/site/sitecustomize.py

@@ -38,7 +38,11 @@ materialx_libs_dir = os.path.abspath(os.path.join(shared_lib_dir, "materialx", "
 materialx_libs_env = os.getenv("MATERIALX_SEARCH_PATH")
 if materialx_libs_env is None:
     os.environ["MATERIALX_SEARCH_PATH"] = materialx_libs_dir
-elif sys.platform == "win32":
-    os.environ["MATERIALX_SEARCH_PATH"] = materialx_libs_dir + ";" + materialx_libs_env
 else:
-    os.environ["MATERIALX_SEARCH_PATH"] = materialx_libs_dir + ":" + materialx_libs_env
+    os.environ["MATERIALX_SEARCH_PATH"] = materialx_libs_env + os.pathsep + materialx_libs_dir
+
+materialx_libs_env = os.getenv("PXR_MTLX_STDLIB_SEARCH_PATHS")
+if materialx_libs_env is None:
+    os.environ["PXR_MTLX_STDLIB_SEARCH_PATHS"] = materialx_libs_dir
+else:
+    os.environ["PXR_MTLX_STDLIB_SEARCH_PATHS"] = materialx_libs_env + os.pathsep + materialx_libs_dir