Inheriting from open.3d.geometry.PointCloud

[levyclan]

I would like to expand the functionality of PointCloud in python and do so by inheritance however my derived class doesn't behave properly e.g. in open3d.visualization.draw_geometries.
Any help would be appreciated.

I am running python 3.6.5 open3d version 0.11.2

class Custom3D(open3d.geometry.PointCloud):
    def __init__(self, init_value=None):

        if init_value is None:
            super().__init__(open3d.utility.Vector3dVector(np.asarray([[]]).reshape(0, 3)))
        elif isinstance(init_value, open3d.utility.Vector3dVector):
            super().__init__(init_value)
        else:
            super().__init__(open3d.utility.Vector3dVector(init_value))


test1 = Custom3D()

test1
Out[11]: PointCloud with 0 points.

points = [[1, 2, 3], [4, 5, 6]]

test2 = Custom3D(points)

test2
Out[16]: PointCloud with 2 points.

open3d.visualization.draw_geometries([test2])
Traceback (most recent call last):
  File "C:\Users\User.DESKTOP-OR7URI1\AppData\Roaming\Python\Python36\site-packages\IPython\core\interactiveshell.py", line 3343, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-17-65e39aeb5468>", line 1, in <module>
    open3d.visualization.draw_geometries([test2])
RuntimeError: Tried to call pure virtual function "Geometry3DBase::"

``