Revert "Merge pull request #7384 from Ultimaker/CURA-7333_Fix_reloading_3mf_files_with_many_objects"

This reverts commit 3e46489b6ba3ae0baab347b26ceb036c1a47007d, reversing
changes made to f5669a5a277042266f9b92314948a5cfb75f58ea.

cura/CuraApplication.py

@@ -2,10 +2,9 @@
 # Cura is released under the terms of the LGPLv3 or higher.
 
 import os
-import re
 import sys
 import time
-from typing import cast, TYPE_CHECKING, Optional, Callable, List, Any, Dict
+from typing import cast, TYPE_CHECKING, Optional, Callable, List, Any
 
 import numpy
 from PyQt5.QtCore import QObject, QTimer, QUrl, pyqtSignal, pyqtProperty, QEvent, Q_ENUMS
@@ -1383,21 +1382,12 @@ class CuraApplication(QtApplication):
         if not nodes:
             return
 
-        objects_in_filename = {}  # type: Dict[str, List[CuraSceneNode]]
         for node in nodes:
             mesh_data = node.getMeshData()
+
             if mesh_data:
                 file_name = mesh_data.getFileName()
                 if file_name:
-                    if file_name not in objects_in_filename:
-                        objects_in_filename[file_name] = []
-                    if file_name in objects_in_filename:
-                        objects_in_filename[file_name].append(node)
-                else:
-                    Logger.log("w", "Unable to reload data because we don't have a filename.")
-
-        for file_name, nodes in objects_in_filename.items():
-            for node in nodes:
                     job = ReadMeshJob(file_name)
                     job._node = node  # type: ignore
                     job.finished.connect(self._reloadMeshFinished)
@@ -1405,6 +1395,8 @@ class CuraApplication(QtApplication):
                         job.finished.connect(self.updateOriginOfMergedMeshes)
 
                     job.start()
+                else:
+                    Logger.log("w", "Unable to reload data because we don't have a filename.")
 
     @pyqtSlot("QStringList")
     def setExpandedCategories(self, categories: List[str]) -> None:
@@ -1580,30 +1572,13 @@ class CuraApplication(QtApplication):
     fileLoaded = pyqtSignal(str)
     fileCompleted = pyqtSignal(str)
 
-    def _reloadMeshFinished(self, job) -> None:
-        """
-        Function called whenever a ReadMeshJob finishes in the background. It reloads a specific node object in the
-        scene from its source file. The function gets all the nodes that exist in the file through the job result, and
-        then finds the scene node that it wants to refresh by its object id. Each job refreshes only one node.
-
-        :param job: The ReadMeshJob running in the background that reads all the meshes in a file
-        :return: None
-        """
-        job_result = job.getResult()  # nodes that exist inside the file read by this job
+    def _reloadMeshFinished(self, job):
+        # TODO; This needs to be fixed properly. We now make the assumption that we only load a single mesh!
+        job_result = job.getResult()
         if len(job_result) == 0:
             Logger.log("e", "Reloading the mesh failed.")
             return
-        object_found = False
-        mesh_data = None
-        # Find the node to be refreshed based on its id
-        for job_result_node in job_result:
-            if job_result_node.getId() == job._node.getId():
-                mesh_data = job_result_node.getMeshData()
-                object_found = True
-                break
-        if not object_found:
-            Logger.warning("The object with id {} no longer exists! Keeping the old version in the scene.".format(job_result_node.getId()))
-            return
+        mesh_data = job_result[0].getMeshData()
         if not mesh_data:
             Logger.log("w", "Could not find a mesh in reloaded node.")
             return

plugins/3MFReader/ThreeMFReader.py

@@ -52,6 +52,7 @@ class ThreeMFReader(MeshReader):
         self._root = None
         self._base_name = ""
         self._unit = None
+        self._object_count = 0  # Used to name objects as there is no node name yet.
 
     def _createMatrixFromTransformationString(self, transformation: str) -> Matrix:
         if transformation == "":
@@ -86,20 +87,17 @@ class ThreeMFReader(MeshReader):
     ##  Convenience function that converts a SceneNode object (as obtained from libSavitar) to a scene node.
     #   \returns Scene node.
     def _convertSavitarNodeToUMNode(self, savitar_node: Savitar.SceneNode, file_name: str = "") -> Optional[SceneNode]:
+        self._object_count += 1
+
         node_name = savitar_node.getName()
-        node_id = savitar_node.getId()
         if node_name == "":
-            if file_name != "":
-                node_name = os.path.basename(file_name)
-            else:
-                node_name = "Object {}".format(node_id)
+            node_name = "Object %s" % self._object_count
 
         active_build_plate = CuraApplication.getInstance().getMultiBuildPlateModel().activeBuildPlate
 
         um_node = CuraSceneNode() # This adds a SettingOverrideDecorator
         um_node.addDecorator(BuildPlateDecorator(active_build_plate))
         um_node.setName(node_name)
-        um_node.setId(node_id)
         transformation = self._createMatrixFromTransformationString(savitar_node.getTransformation())
         um_node.setTransformation(transformation)
         mesh_builder = MeshBuilder()
@@ -171,6 +169,7 @@ class ThreeMFReader(MeshReader):
 
     def _read(self, file_name: str) -> Union[SceneNode, List[SceneNode]]:
         result = []
+        self._object_count = 0  # Used to name objects as there is no node name yet.
         # The base object of 3mf is a zipped archive.
         try:
             archive = zipfile.ZipFile(file_name, "r")