Error in 3D viewer with "picked" coordinate display

[ssilburn]

The following exception raised in the 3D viewer GUI when:

1. Picking 2 points using the "c" keyboard shortcut
2. Setting the display type for these to "cone"
3. Then deleting one of the two points from the list.

DIAGNOSTIC INFORMATION
----------------------

Platform:       win32
Python version: 3.13.14 (tags/v3.13.14:fd17997, Jun 10 2026, 13:03:48) [MSC v.1944 64 bit (AMD64)]
Calcam version: 2.17.1
VTK version:    9.6.0
OpenCV version: 4.13.0
PyQt version:   5.15.2

Traceback (most recent call last):
  File "C:\Python\lib\calcam\calcam\gui\viewer.py", line 425, in delete_saved_coord
    actor.coords = np.delete(actor.coords,self.cursor_coords_table.currentRow(),axis=0)
    ^^^^^^^^^^^^
  File "C:\Python\lib\calcam\calcam\render.py", line 145, in coords
    self.frustrumsize = fs
    ^^^^^^^^^^^^^^^^^
  File "C:\Python\lib\calcam\calcam\render.py", line 346, in frustrumsize
    raise Exception('Can only use frustrum display for disconnected line segments!')
Exception: Can only use frustrum display for disconnected line segments!