SUMMARY Mayavi's plots don't show up/work in Cantor STEPS TO REPRODUCE 0. You probably need to set first in your environment QT_API=pyqt5 1. Install Mayavi: https://docs.enthought.com/mayavi/mayavi/ 2. Try the demo example: https://docs.enthought.com/mayavi/mayavi/mlab.html OBSERVED RESULT Cantor hangs on 'Calculating…', no plots are shown. EXPECTED RESULT A nice plot from the above example. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Ubuntu 18.04.2 (available in About System) KDE Plasma Version: N/A (irrelevant, but) (Unity) KDE Frameworks Version: (irrelevant, but) any from v5.44.0 backported to, to v5.58.0 (backported) Qt Version: (less relevant, but) v5.9.5 backported to, or any released up to date ADDITIONAL INFORMATION I may be unavailable to respond, however, with the following it should be enough to replicate the bug: Installing Mayavi might be not trivial, depending on your environment, pay attention to the Warning section in step 2 above that suggests using qt4 and use qt5 instead as in step 0. In Debian/Ubuntu it is available via 'sudo apt-get install mayavi2' (= 4.5.0), but the latest 4.6.2 version is available and was actually used for the present report. The demo example works flawlessly in the Python2 jupyter-qtconsole (now deprecated), and should also similarly work in the environments like nteract and JupyterLab (haven't tried though). Attn: the demo generating data is about 16Mb, but the key difference is, likely, Qt interaction with cantor. Any other example would suffice instead.
Same problem. But I also see a problem, that in my system, mayavi works only with qt5, and crash, if I try to use qt4 or wx (segfault in python2 interpreter). As I see, the problem is that cantor python2server crash on mlab function or on import (similar, how it happends with another UI backends in interpreter, as I describe above).
> mayavi works only with `qt5`, and crash, if I try to use `qt4` or `wx` Qt4: yes, the above happens because your and my tools **are Qt5-compiled** what clashes with Qt4 implementation (either of them, but not both). You need to have a very old-old `jupyter-qtconsole` compiled against Qt4 to have the working Qt4 backend (I couldn't find it in a meaningful time on the Internet; and in any case Mayavi's official way defaulting to Qt4 seems an oudated choice for today; just edit your qt/__init__.py in `pyface` for convenience ;-) …or `pyside`, which is Qt4-based; …or `pyside2`, which is Qt5-based, so it stands a chance, but only with the following two consequtive fixes, see the discussion here: https://stackoverflow.com/q/52337856 https://bugreports.qt.io/browse/PYSIDE-816 https://codereview.qt-project.org/c/pyside/pyside-setup/+/252439 https://bugreports.qt.io/browse/PYSIDE-1003 https://codereview.qt-project.org/c/pyside/pyside-setup/+/261332 …or, indeed, `wx` for Python/Python3: https://packages.ubuntu.com/src:wxpython3.0 https://packages.ubuntu.com/src:wxpython4.0 /wxpython4.1 (available in beta in the wild), I also could not understand why `wx` is not working; may-be some sort of a Python wx-based or agnistic IDE is needed for that for testing (IDLE?).
(BTW, you need vtk-$version.egg-info directory (create it manualy if it doesn't exist in your distribution) for trying M. with any VTK 6/7/8, it seems to be a bug, as it couldn't find it. Mayavi no longer needs a vtk63.patch also under Debian/Ubuntu, it has been fixed; see #mayavi/issues/797)
```python from traits.etsconfig.api import ETSConfig ETSConfig.toolkit = 'wx' ``` #https://stackoverflow.com/questions/52930781/qt-api-environment-variable ```python import os os.environ["QT_API"] = "pyqt5" ``` To manipulate it from under Python(s) without a restart. Setting ETSConfig.toolkit = 'wx' under Python 3 + VTK 8 + Mayavi 4.7.0 (compiled from sources + `apptools` fix) actually does work under IDLE and **not** under Cantor (see below), but not under Python 2 + VTK 6. ```python from traits.etsconfig.api import ETSConfig ETSConfig.toolkit = 'wx' # Create the data. from numpy import pi, sin, cos, mgrid dphi, dtheta = pi/250.0, pi/250.0 [phi,theta] = mgrid[0:pi+dphi*1.5:dphi,0:2*pi+dtheta*1.5:dtheta] m0 = 4; m1 = 3; m2 = 2; m3 = 3; m4 = 6; m5 = 2; m6 = 6; m7 = 4; r = sin(m0*phi)**m1 + cos(m2*phi)**m3 + sin(m4*theta)**m5 + cos(m6*theta)**m7 x = r*sin(phi)*cos(theta) y = r*cos(phi) z = r*sin(phi)*sin(theta) # View it. from mayavi import mlab s = mlab.mesh(x, y, z) mlab.show() ``` /usr/lib/python3/dist-packages/pyface/ui/wx/clipboard.py:25: wxPyDeprecationWarning: Call to deprecated item. Use wx.DataFormat instead. PythonObjectFormat = wx.CustomDataFormat('PythonObject') /usr/lib/python3/dist-packages/pyface/wx/drag_and_drop.py:99: wxPyDeprecationWarning: Call to deprecated item. Use wx.DataFormat instead. PythonObject = wx.CustomDataFormat('PythonObject') /usr/lib/python3/dist-packages/pyface/ui/wx/action/action_item.py:378: wxPyDeprecationWarning: Call to deprecated item. Use :meth:`AddTool` instead. self.control_id, label, bmp, wx.NullBitmap, kind, tooltip, longtip, None /usr/lib/python3/dist-packages/pyface/ui/wx/action/action_item.py:396: wxPyDeprecationWarning: Call to deprecated item __call__. Use :meth:`EvtHandler.Bind` instead. wx.EVT_TOOL(parent, self.control_id, self._on_tool) Traceback (most recent call last): File "", line 19, in File "/usr/lib/python3/dist-packages/mayavi/tools/helper_functions.py", line 37, in the_function return pipeline(*args, **kwargs) File "/usr/lib/python3/dist-packages/mayavi/tools/helper_functions.py", line 77, in __call__ scene = tools.gcf().scene File "/usr/lib/python3/dist-packages/mayavi/tools/figure.py", line 117, in gcf return figure(engine=engine) File "/usr/lib/python3/dist-packages/mayavi/tools/figure.py", line 69, in figure engine.new_scene(name=name, size=size) File "/usr/lib/python3/dist-packages/apptools/scripting/recordable.py", line 45, in _wrapper result = func(*args, **kw) File "/usr/lib/python3/dist-packages/mayavi/core/engine.py", line 452, in new_scene viewer = self.scene_factory(**factory_kwargs) File "/usr/lib/python3/dist-packages/mayavi/core/ui/mayavi_scene.py", line 89, in viewer_factory viewer.open() File "/usr/lib/python3/dist-packages/pyface/i_window.py", line 202, in open self._create() File "/usr/lib/python3/dist-packages/pyface/ui/wx/application_window.py", line 140, in _create contents = self._create_contents(self.control) File "/usr/lib/python3/dist-packages/tvtk/tools/ivtk.py", line 406, in _create_contents self.scene = self._scene_factory(parent) File "/usr/lib/python3/dist-packages/mayavi/core/ui/mayavi_scene.py", line 68, in mayavi_scene_factory s = MayaviScene(parent, stereo=p['stereo']) File "/usr/lib/python3/dist-packages/tvtk/pyface/ui/wx/decorated_scene.py", line 69, in __init__ super(DecoratedScene, self).__init__(parent, **traits) File "/usr/lib/python3/dist-packages/tvtk/pyface/ui/wx/scene.py", line 285, in __init__ super(Scene, self).__init__(parent, **traits) File "/usr/lib/python3/dist-packages/tvtk/pyface/tvtk_scene.py", line 222, in __init__ self.control = self._create_control(parent) File "/usr/lib/python3/dist-packages/tvtk/pyface/ui/wx/decorated_scene.py", line 107, in _create_control self._sizer.Layout() wx._core.wxAssertionError: C++ assertion "m_widget" failed at ../src/gtk/window.cpp(2857) in DoSetSize(): invalid window Error in sys.excepthook: Traceback (most recent call last): File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 145, in apport_excepthook os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o640), 'wb') as f: FileNotFoundError: [Errno 2] No such file or directory: '/var/crash/_usr_bin_cantor_python3server.1000.crash' Original exception was: Traceback (most recent call last): File "", line 19, in File "/usr/lib/python3/dist-packages/mayavi/tools/helper_functions.py", line 37, in the_function return pipeline(*args, **kwargs) File "/usr/lib/python3/dist-packages/mayavi/tools/helper_functions.py", line 77, in __call__ scene = tools.gcf().scene File "/usr/lib/python3/dist-packages/mayavi/tools/figure.py", line 117, in gcf return figure(engine=engine) File "/usr/lib/python3/dist-packages/mayavi/tools/figure.py", line 69, in figure engine.new_scene(name=name, size=size) File "/usr/lib/python3/dist-packages/apptools/scripting/recordable.py", line 45, in _wrapper result = func(*args, **kw) File "/usr/lib/python3/dist-packages/mayavi/core/engine.py", line 452, in new_scene viewer = self.scene_factory(**factory_kwargs) File "/usr/lib/python3/dist-packages/mayavi/core/ui/mayavi_scene.py", line 89, in viewer_factory viewer.open() File "/usr/lib/python3/dist-packages/pyface/i_window.py", line 202, in open self._create() File "/usr/lib/python3/dist-packages/pyface/ui/wx/application_window.py", line 140, in _create contents = self._create_contents(self.control) File "/usr/lib/python3/dist-packages/tvtk/tools/ivtk.py", line 406, in _create_contents self.scene = self._scene_factory(parent) File "/usr/lib/python3/dist-packages/mayavi/core/ui/mayavi_scene.py", line 68, in mayavi_scene_factory s = MayaviScene(parent, stereo=p['stereo']) File "/usr/lib/python3/dist-packages/tvtk/pyface/ui/wx/decorated_scene.py", line 69, in __init__ super(DecoratedScene, self).__init__(parent, **traits) File "/usr/lib/python3/dist-packages/tvtk/pyface/ui/wx/scene.py", line 285, in __init__ super(Scene, self).__init__(parent, **traits) File "/usr/lib/python3/dist-packages/tvtk/pyface/tvtk_scene.py", line 222, in __init__ self.control = self._create_control(parent) File "/usr/lib/python3/dist-packages/tvtk/pyface/ui/wx/decorated_scene.py", line 107, in _create_control self._sizer.Layout() wx._core.wxAssertionError: C++ assertion "m_widget" failed at ../src/gtk/window.cpp(2857) in DoSetSize(): invalid window
Just a note, Python 3.6.8 + VTK 8.1.2 + Mayavi 4.6.2 and wx don't work, failed "RuntimeError: No pyface.toolkits plugin could be loaded for wx".
yeah, I vaguely remember smth like that On a slightly unrelated note: In addition to modifying pyface/qt/__init__.py it make sense also modify pyface/base_toolkit.py, adding `'qt': -3,` in TOOLKIT_PRIORITIES to ease Qt5 usability without too much fuss with env. variables
- for `wx` to work in Python 3 you have to install https://packages.ubuntu.com/src:wxpython4.0 python3-package (not tested with Mayavi 4.6.2, tested with 4.7.0)
`wx` works under IDLE (not under Cantor though)
with my pre-last edit suggestion I've almost got the `wx` backend working in cantor, running it additionally and "over-ensurely" through `ETS_TOOLKIT=wx cantor` It has produced the non-interactive picture inside Cantor as in the demo with a bunch of warnings in the log, and a non-working _separate_ VTK/Mayavi window. I prepended the demo code more additionally and "over-ensurely" with: ``` python import os os.environ["QT_API"] = "pyqt5" from traits.etsconfig.api import ETSConfig ETSConfig.toolkit = 'wx' ```
Just disable image integration for python backend, and all will be works fine with wx. Honestly speaking, image support in Python backend works not so good, and in this case, we have false positive running of image result handeling code, which cases problem with mayavi plot viewer.
Created attachment 121258 [details] Success mayavi plot example
Feel free to close as "Resolved", if it will works for you