Hi all,
I'm developing some code to display coordinate frames and links for robot
arms for a class I teach on robotics. Myself and a TA used pyqtgraph
successfully a few years ago with older versions of Ubuntu (20.04) and
pyqtgraph.
However, recently, when I tried to update the code for students to use with
Ubuntu 22.04, Python 3.11, and using the VS code IDE, I get errors on the
command line every time I try to render a GLMeshItem object and the display
window only shows a blank grid. I thought that the inputs or data types for
this object had changed. But the example provided in the library give the
same error for any 3D mesh rendering.
I can reproduce a similar error with the basic example in the attached
code. This code gives the following error when I run it:
- QSocketNotifier: Can only be used with threads started with QThread
/usr/lib/python3/dist-packages/pyqtgraph/opengl/GLViewWidget.py:260:
RuntimeWarning:
Traceback (most recent call last):
File "/home/robotics/robotics_hw_2022/test_sphere_debug.py", line 30,
in <module>
QtWidgets.QApplication.instance().exec_()
File
"/usr/lib/python3/dist-packages/pyqtgraph/opengl/GLViewWidget.py", line
239, in paintGL
self.drawItemTree(useItemNames=useItemNames)
File
"/usr/lib/python3/dist-packages/pyqtgraph/opengl/GLViewWidget.py", line
271, in drawItemTree
self.drawItemTree(i, useItemNames=useItemNames)
File
"/usr/lib/python3/dist-packages/pyqtgraph/opengl/GLViewWidget.py", line
260, in drawItemTree
debug.printExc()
--- exception caught here ---
File "/usr/lib/python3/dist-packages/OpenGL/latebind.py", line 43, in
__call__
return self._finalCall( *args, **named )
TypeError: 'NoneType' object is not callable
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/usr/lib/python3/dist-packages/pyqtgraph/opengl/GLViewWidget.py", line
257, in drawItemTree
i.paint()
File
"/usr/lib/python3/dist-packages/pyqtgraph/opengl/items/GLMeshItem.py", line
177, in paint
glVertexPointerf(verts)
File "/usr/lib/python3/dist-packages/OpenGL/latebind.py", line 47, in
__call__
return self._finalCall( *args, **named )
File "/usr/lib/python3/dist-packages/OpenGL/wrapper.py", line 626, in
wrapperCall
storeValues(
File "/usr/lib/python3/dist-packages/OpenGL/arrays/arrayhelpers.py",
line 156, in __call__
contextdata.setValue( self.constant, pyArgs[self.pointerIndex] )
File "/usr/lib/python3/dist-packages/OpenGL/contextdata.py", line 58,
in setValue
context = getContext( context )
File "/usr/lib/python3/dist-packages/OpenGL/contextdata.py", line 40,
in getContext
raise error.Error(
OpenGL.error.Error: Attempt to retrieve context when no valid context
debug.printExc()
Error while drawing item <pyqtgraph.opengl.items.GLMeshItem.GLMeshItem
object at 0x7efd483d1360>.
/usr/lib/python3/dist-packages/pyqtgraph/opengl/GLViewWidget.py:260:
RuntimeWarning:
Traceback (most recent call last):
File "/home/robotics/robotics_hw_2022/test_sphere_debug.py", line 30,
in <module>
QtWidgets.QApplication.instance().exec_()
File
"/usr/lib/python3/dist-packages/pyqtgraph/opengl/GLViewWidget.py", line
239, in paintGL
self.drawItemTree(useItemNames=useItemNames)
File
"/usr/lib/python3/dist-packages/pyqtgraph/opengl/GLViewWidget.py", line
271, in drawItemTree
self.drawItemTree(i, useItemNames=useItemNames)
File
"/usr/lib/python3/dist-packages/pyqtgraph/opengl/GLViewWidget.py", line
260, in drawItemTree
debug.printExc()
--- exception caught here ---
File
"/usr/lib/python3/dist-packages/pyqtgraph/opengl/GLViewWidget.py", line
257, in drawItemTree
i.paint()
File
"/usr/lib/python3/dist-packages/pyqtgraph/opengl/items/GLMeshItem.py", line
177, in paint
glVertexPointerf(verts)
File "/usr/lib/python3/dist-packages/OpenGL/latebind.py", line 43, in
__call__
return self._finalCall( *args, **named )
File "/usr/lib/python3/dist-packages/OpenGL/wrapper.py", line 626, in
wrapperCall
storeValues(
File "/usr/lib/python3/dist-packages/OpenGL/arrays/arrayhelpers.py",
line 156, in __call__
contextdata.setValue( self.constant, pyArgs[self.pointerIndex] )
File "/usr/lib/python3/dist-packages/OpenGL/contextdata.py", line 58,
in setValue
context = getContext( context )
File "/usr/lib/python3/dist-packages/OpenGL/contextdata.py", line 40,
in getContext
raise error.Error(
OpenGL.error.Error: Attempt to retrieve context when no valid context
debug.printExc()
Error while drawing item <pyqtgraph.opengl.items.GLMeshItem.GLMeshItem
object at 0x7efd483d1360>.
Error while drawing item <pyqtgraph.opengl.items.GLMeshItem.GLMeshItem
object at 0x7efd483d1360>.
A similar type of error happens with the 3D data examples provided in the
library when running this code:
- import pyqtgraph.examples
pyqtgraph.examples.run()
This error only seems to happen when running the code from within the VS
Code IDE (even if I try to run it from the terminal within VS code). When
running it from the normal command line, there's no problem. Any idea why
this might be the case? Any suggestions of how to solve it? I have tried
changing the python interpreter being used by VS code, but it doesn't make
a difference (and it seems to match the version being called from the
normal command line anyway).
Thanks for any pointers or direction.
Sincerely,
Marc
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from pyqtgraph.Qt import QtCore, QtWidgets
import pyqtgraph.opengl as gl
import numpy as np
import sys
app = QtWidgets.QApplication([])
w = gl.GLViewWidget()
w.show()
w.setCameraPosition(distance=15, azimuth=-90)
g = gl.GLGridItem()
w.addItem(g)
md = gl.MeshData.sphere(rows=20, cols=20, radius=1)
m1 = gl.GLMeshItem(
meshdata=md,
smooth=True,
color=np.array([1, 0, 0, 1]),
shader="shaded",
glOptions="additive",
)
w.addItem(m1)
if __name__ == "__main__":
if (sys.flags.interactive != 1) or not hasattr(QtCore, "PYQT_VERSION"):
QtWidgets.QApplication.instance().exec_()
