[Bug]: Error in .to_global() Method for Slice Files with masked=True

What happened?

Hi, I encountered an issue when using the .to_global() method for Slice files in fdsreader. When setting masked=True, an error occurs, whereas setting masked=False works as expected. This suggests that the issue is related to handling the masked option.

Since displaying obstructions for better orientation is very useful, I would appreciate it if you could investigate this issue :) I have attached a demo FDS file for reproduction.

TEST_CASE.txt

error:

ValueError Traceback (most recent call last)
Cell In[6], line 9
7 slc=sim.slices
8 slc_soot = slc.get_by_id("SOOT_Z_Decke")
----> 9 data_slc, grid_coords = slc_soot.to_global(masked=True, fill=np.nan, return_coordinates=True)

File ~\AppData\Local\anaconda3\Lib\site-packages\fdsreader\slcf\slice.py:648, in Slice.to_global(self, masked, fill, return_coordinates)
644 if masked:
645 slc_data = np.where(mask, slc_data, fill)
647 grid[:, start_idx['x']: end_idx['x'], start_idx['y']: end_idx['y'],
--> 648 start_idx['z']: end_idx['z']] = slc_data.reshape(
649 (self.n_t, end_idx['x'] - start_idx['x'], end_idx['y'] - start_idx['y'],
650 end_idx['z'] - start_idx['z']))
652 if return_coordinates:
653 coordinates = dict()

ValueError: cannot reshape array of size 0 into shape (76,67,69,1)

Steps to reproduce

import fdsreader as fds
import numpy as np

path=r"-----"

sim=fds.Simulation(path)
slc=sim.slices
slc_soot = slc.get_by_id("SOOT_Z_Decke")
data_slc, grid_coords = slc_soot.to_global(masked=True, fill=np.nan, return_coordinates=True)

FDS version used

FDS-6.9.1-0-g889da6a-release

fdsreader version used

1.11.6

Beginne bei der Methode Slice.to_global() in fdsreader/slcf/slice.py und reproduziere den Fehler mit der angehängten TEST_CASE.txt unter Verwendung von masked=True. Vergleiche das Ergebnis anschließend mit masked=False. Verfolge die Dimensionen von Maske und reshape rund um die gemeldete Zeile. Als erledigt gilt die Aufgabe, wenn das Beispiel ohne ValueError abgeschlossen wird und gültige globale Daten und Koordinaten zurückgibt.