Adding/overiding callbacks to VisualizerWithEditing

[lee-deraud]

I've got a simple BFMI app using the VisualizerWithEditing class, and I'd like to remove/override some of the default key bindings. I have no problem with similar code in the VisualizerWithKeyCallback class, but I'd just as soon not have to reinvent the whole point-picking wheel that the with-edit class provides. Working under the assumption that VisualizerWithEditing is a child class of VisualizerWithKeyCallback, I tried using the 'super()' function and got this error:

  File "A:\3D\Scanner\Orient\OrientExpress.py", line 75, in pick_plane
    super().vis.register_key_action_callback(ord("["), on_ignore)
    ^^^^^^^
RuntimeError: super(): __class__ cell not found

The function in question is NOT inside a class definition, if that matters. (And yes, I'm relatively new to Python, thanks for asking.)

def show_pointcloud(pcd):
    p = np.array([0.0,0.0,0.0,BADFLAG])

    def on_ignore(vis, action, mods):
        return False

    vis = o3d.visualization.VisualizerWithEditing()
    super().vis.register_key_action_callback(ord("["), on_ignore)
    vis.create_window(window_name=ptext,width=1280,height=1024)
# etc

Suggestions?

[lee-deraud]

UPDATE: As it turns out, VisualizerWithEditting is not a child class of VisualizerWithKeyCallback: I guess that made too much sense. They're both child classes of Visualizer, although it seems like big chunks got duplicated between the two.

Second try involved a new child class with multiple inheritance from V-WithEditting and V-WithKeyCallbacks, as per an exmple I saw here:

import open3d as o3d

class VKE(o3d.visualization.VisualizerWithKeyCallback,
          o3d.visualization.VisualizerWithEditing):
    def __init__(self):
        o3d.visualization.VisualizerWithEditing.__init__(self)
        o3d.visualization.VisualizerWithKeyCallback.__init__(self)

def foo(name):
    vis = VKE()

foo("foobar")

results in:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "A:\3D\Scanner\Orient\Samples\MI.py", line 28, in <module>
    foo("foobar")
  File "A:\3D\Scanner\Orient\Samples\MI.py", line 26, in foo
    vis = VKE()
          ^^^^^
  File "A:\3D\Scanner\Orient\Samples\MI.py", line 22, in __init__
    o3d.visualization.VisualizerWithEditing.__init__(self)
TypeError: pybind11::init(): unable to convert returned instance to required alias class: no `Alias<Class>(Class &&)` constructor available

Maybe this was a bad idea.