Problem with interactive view

[mturiansky]

Description

I'm running into a problem with the interactive view with code that had previous run fine before updating my environment. I presume one of the updated libraries is the problem (I suspect something with pyside2). The problem occurs when manipulating a scene in the interactive view:

Output

TypeError: 'PySide2.QtCore.Qt.KeyboardModifier' object cannot be interpreted as an integer

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/mark/.virtualenvs/abcv/lib/python3.11/site-packages/fresnel/interact.py", line 315, in mouseMoveEvent
    self._camera_controller.orbit(yaw=delta.x(),
  File "/home/mark/.virtualenvs/abcv/lib/python3.11/site-packages/fresnel/interact.py", line 63, in orbit
    basis = numpy.array(self._start_camera.basis)
                        ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mark/.virtualenvs/abcv/lib/python3.11/site-packages/fresnel/camera.py", line 124, in basis
    b = _common.CameraBasis(self._camera)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SystemError: <class 'fresnel._common.CameraBasis'> returned a result with an exception set

The above issue gets repeated several times and the camera is not updated upon dragging. I can verify that self.scene.camera.basis was valid before going into the interactive view. I can also generate images non-interactively.

Configuration

I compiled the code myself on my Arch linux machine using the CPU to render the images. Here are some of the versions:

Platform:

• Linux
• CPU

Installation method:

• Compiled from source

Versions:

• Python version: 3.11.8
• Fresnel version: 0.13.5
• QHull: 2020.2-4
• Embree: 4.3.1-1
• Pyside2: 5.13.2
• Numpy: 1.26.4
• Pybind11: 2.12.0-2
• Cmake: 3.29.1-1
• GCC: 13.2.1-5

Developer

Sure.

As a side note, I didn't see rowan listed as a dependency in the install instructions. This caused an error when importing fresnel after installing it, which of course was easily fixed by explicitly installing it.

[joaander]

Thanks for reporting. It is possible that the API for PySide2.QtCore.Qt.KeyboardModifier has changed. Feel free to submit a pull request that fixes the problem.

[mturiansky]

If I find some time, I'll take a look at it. It looks like PySide2 is eventually going to be phased out with PySide6. Any opposition to updating the dependency if it helps to resolve the problem?

[joaander]

Yes, please feel free to update fresnel to the latest version of the PySide.