Hi, I am new on Coreform Cubit. I am following the Cardinal tutorial "Converting CSG to CAD Geometry for Multiphysics"https://cardinal.cels.anl.gov/tutorials/csg_to_cad.html which need to use the Coreform Cubit. When I tried to use the DAGMC toolbar mentioned in the tutorial, the terminal shows an error:
********* Now playing /home/mechaos/cubit-dagmc-toolbar-main/scripts/groups_to_block_mats.py **********
Adding /home/mechaos/cubit-dagmc-toolbar-main/scripts to path
Journaled Command: print(‘Adding ’ + filepath + ’ to path’)
Journaled Command: sys.path.append(filepath)
Journaled Command:
Journaled Command: import cubit
Traceback (most recent call last):
File “”, line 1, in
File “/home/mechaos/cubit-dagmc-toolbar-main/scripts/utils.py”, line 1, in
import PyQt5.QtWidgets as QtWidgets
ModuleNotFoundError: No module named ‘PyQt5’
Current directory is ‘/home/mechaos/Coreform-Cubit-2025.8/bin/’
Journaled Command: cd “/home/mechaos/Coreform-Cubit-2025.8/bin”
It seems that the Cubit doesn’t have PyQt5 installed. I tried to install the module on the terminal but it didn’t work. What should I do to fix that?
Try using an older version of Coreform Cubit for now, prior to 2025.8. The 2025.8 version of Coreform Cubit now uses Qt6 and the latest developers release include PySide6. PySide and PyQt are two different GUI interfaces to the Qt library. PySide is officially support by the Qt Company.
I will look at the dagmc too and update those for PySide6. The changes are pretty simple.
Hi, Karl. Thanks for your suggestion. I downloaded the old version(2024.08), but somehow, my account can’t pass the old version Cubit activation. I can’t figure out the reason yet.
You will need to download a new version of Coreform Cubit that includes PySide6 in the packaging. Go to Coreform - Coreform Downloads and scroll down to the section that says “Latest Develoment Builds.” Get the most recent version.
. Let me know if you need instructions to install this or if you still have problems.
Hi, Karl. I downloaded the development version “Coreform-Cubit-2025.11-rc+64249”. There were no problems during installation, while the dagmc toolbar have to make some adjustments about the script path to run. Then I met another error: “AssertionError: SRE module mismatch”
********** Now playing /home/mechaos/cubit-dagmc-toolbar-pyside6/scripts/about_DAGMC.py **********
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/home/mechaos/Coreform-Cubit-2025.11/bin/python3/lib/python3.10/site-packages/PySide6/__init__.py", line 3, in <module>
from pathlib import Path
File "/home/mechaos/anaconda3/envs/moose/lib/python3.13/pathlib/__init__.py", line 8, in <module>
from ._abc import *
File "/home/mechaos/anaconda3/envs/moose/lib/python3.13/pathlib/_abc.py", line 15, in <module>
from glob import _Globber, _no_recurse_symlinks
File "/home/mechaos/anaconda3/envs/moose/lib/python3.13/glob.py", line 5, in <module>
import re
File "/home/mechaos/anaconda3/envs/moose/lib/python3.13/re/__init__.py", line 126, in <module>
from . import _compiler, _parser
File "/home/mechaos/anaconda3/envs/moose/lib/python3.13/re/_compiler.py", line 18, in <module>
assert _sre.MAGIC == MAGIC, "SRE module mismatch"
AssertionError: SRE module mismatch
Current directory is '/home/mechaos/Coreform-Cubit-2025.11/bin/'
Journaled Command: cd "/home/mechaos/Coreform-Cubit-2025.11/bin"
Hi, Karl. The problem was solved. I forgot that I had modified the python path on general options. I reset the options to use the default python 3 and problem was gone.
Hi, Karl. Sadly, I met another problem. The tooltip “DAGMC” and “Generate a DAGMC faceting report” are work well, but when I try the “Convert DAGMC Group Assignments to Block Assignments”, I met a name error " ‘Qt’ is not defined ":
********** Now playing /home/mechaos/cubit-dagmc-toolbar-pyside6/scripts/groups_to_block_mats.py **********
Journaled Command: import os
Journaled Command: import sys
Journaled Command:
Journaled Command: filepath = os.path.dirname(os.path.abspath("__file__"))
Adding /home/mechaos/cubit-dagmc-toolbar-pyside6/scripts to path
Journaled Command: print('Adding ' + filepath + ' to path')
Journaled Command: sys.path.append(filepath)
Journaled Command:
Journaled Command: import cubit
Journaled Command: from utils import find_claro
Journaled Command: from functools import partial
Journaled Command:
Journaled Command: from PySide6.QtWidgets import QApplication, QCheckBox, QVBoxLayout, QWidget,\
QMessageBox, QFrame, QScrollArea, QPushButton,\
QHBoxLayout
Journaled Command:
Journaled Command: def dagmc_groups():
"""Retrieves groups containing DAGMC metadata
Returns:
dict: Dictionary of groups containing DAGMC metadata with
group id as key and group name as value
"""
out = {}
for (name, gid) in cubit.group_names_ids():
# skip the 'picked' group and other groups
# that aren't materials
if name == 'picked' or 'mat' not in name:
continue
out[gid] = name
return out
Journaled Command: def convert_groups_to_blocks(checks):
"""Converts groups containing DAGMC metadata to material assignments
based on mesh blocks in Cubit
Args:
checks : Iterable of Bool values indicating whether the group
should be converted to a block or not
"""
for (checked, (gid, name)) in zip(checks, dagmc_groups().items()):
if not checked:
continue
mat = name.split('/')[0].split(':')[1]
if not mat:
print(f'WERID MAT: {mat}')
continue
# get all volumes and bodies for this group
volumes = cubit.get_group_volumes(gid)
bodies = cubit.get_group_bodies(gid)
# create a new block
block_id = cubit.get_next_block_id()
cmd = f'create block {block_id}'
cubit.cmd(cmd)
if len(volumes) != 0:
vols = " ".join([str(v) for v in volumes])
cmd = f'block {block_id} add volume {" ".join(volumes)}'
cubit.cmd(cmd)
if len(bodies) != 0:
bods = " ".join([str(b) for b in bodies])
cmd = f'block {block_id} add body {bods}'
cubit.cmd(cmd)
# create a new material with the material identifier for
# this group
cmd = f'create material name "{mat}"'
cubit.cmd(cmd)
# assign the new material to the mesh group
cmd = f'block {block_id} material "{mat}"'
cubit.cmd(cmd)
Journaled Command: def main():
app = find_claro()
converter_window = QWidget(parent=app, f=Qt.Window)
converter_window.setWindowTitle("DAGMC Group to Block Conversion")
# Set a fixed width to display the full title
converter_window.resize(400, 300) # Initial width and height
# Layout for checkboxes
checkboxes = []
converter_layout = QVBoxLayout()
checkboxLayout = QVBoxLayout()
# Create checkboxes
for (gid, name) in dagmc_groups().items():
checkboxes.append(QCheckBox(f'Group {gid}: {name}'))
checkboxes[-1].setCheckState(2)
checkboxLayout.addWidget(checkboxes[-1])
# Scroll area setup
scrollArea = QScrollArea()
scrollWidget = QWidget()
scrollWidget.setLayout(checkboxLayout)
scrollArea.setWidget(scrollWidget)
scrollArea.setWidgetResizable(True)
scrollArea.resize(400, 200)
converter_window.setLayout(converter_layout)
converter_window.show()
# Create "Select All" and "Deselect All" checkboxes
selectAllWidget = QPushButton("Select All")
deselectAllWidget = QPushButton("Deselect All")
# Set "Select All" and "Deselect All" actions
selectAllWidget.clicked.connect(lambda _: [c.setCheckState(2) for c in checkboxes])
deselectAllWidget.clicked.connect(lambda _: [c.setCheckState(0) for c in checkboxes])
# Add "Select All" and "Deselect All" to a horizontal layout
selectButtonLayout = QHBoxLayout()
selectButtonLayout.addWidget(selectAllWidget)
selectButtonLayout.addWidget(deselectAllWidget)
# Create a line separator between selection and action buttons
line = QFrame()
line.setFrameShape(QFrame.HLine)
line.setFrameShadow(QFrame.Sunken)
# Create buttons
cancelButton = QPushButton("Cancel")
convertButton = QPushButton("Convert")
# Set button actions
close_window = partial(converter_window.close)
def convert_and_close():
# create mask and pass to conversion function
checks = [c.isChecked() for c in checkboxes]
convert_groups_to_blocks(checks)
close_window()
cancelButton.clicked.connect(close_window)
convertButton.clicked.connect(convert_and_close)
# Add buttons to a horizontal layout
buttonLayout = QHBoxLayout()
buttonLayout.addWidget(cancelButton)
buttonLayout.addWidget(convertButton)
# Add button layout to the main layout
converter_layout.addWidget(scrollArea)
converter_layout.addLayout(selectButtonLayout)
converter_layout.addWidget(line)
converter_layout.addLayout(buttonLayout)
# ensure the window appears in the center of the screen
# I don't think this is needed if we set claro as the parent
# The QWidget will then be centered on Cubit
#desktop = QApplication.desktop().screenGeometry()
#desktop = app.window().geometry()
#window_geometry = converter_window.frameGeometry()
#window_geometry.moveCenter(desktop.center())
#converter_window.move(window_geometry.topLeft())
Traceback (most recent call last):
File "<string>", line 2, in <module>
File "<string>", line 5, in main
NameError: name 'Qt' is not defined
Current directory is '/home/mechaos/Coreform-Cubit-2025.11/bin/'
Journaled Command: cd "/home/mechaos/Coreform-Cubit-2025.11/bin"
Can you modify the groups_to_blockt_mats.py? Try adding the line from PySide6.QtCore import Qt
near where the other PySide6 definitions are imported. I’m not quite sure why it would work in on my machine but not yours.
import os
import sys
filepath = os.path.dirname(os.path.abspath("__file__"))
print('Adding ' + filepath + ' to path')
sys.path.append(filepath)
import cubit
from utils import find_claro
from functools import partial
from PySide6.QtCore import Qt
from PySide6.QtWidgets import QApplication, QCheckBox, QVBoxLayout, QWidget,\
QMessageBox, QFrame, QScrollArea, QPushButton,\
QHBoxLayout
And tried again the tool, another new error occurred
Traceback (most recent call last):
File "<string>", line 2, in <module>
File "<string>", line 19, in main
TypeError: 'PySide6.QtWidgets.QCheckBox.setCheckState' called with wrong argument types:
PySide6.QtWidgets.QCheckBox.setCheckState(int)
Supported signatures:
PySide6.QtWidgets.QCheckBox.setCheckState(PySide6.QtCore.Qt.CheckState)
Current directory is '/home/mechaos/Coreform-Cubit-2025.11/bin/'
Journaled Command: cd "/home/mechaos/Coreform-Cubit-2025.11/bin"
I understand why I am not be seeing that error. I did not test with and dagmc groups created. This code at lines 91 to 96 only creates checkboxes if there are dagmc groups.
Instead of setCheckState(2) at line 95 in the new syntax that should be setCheckState(Qt.Checked). Lines 114 and 115 also need to be updated. The 2 should be changed to Qt.Checked and the 0 goes to Qt.Unchecked.
Thanks for helping me debug this. I will run a full case in the morning.
