`spheres_from_coords` does not allow to add one sphere and adding spheres in same plane (not at 0!) will result in 2D-image

[heinsimon]

Problem

• Call to spheres_from_coords with just one sphere in df results in IndexError
• Call to spheres_from_coords with just all sphere in one plane and that plane not being at 0 will result in an 2D-image

Example

import porespy as ps
import numpy as np

df_onesphere={}
df_onesphere['X']=np.array([23])
df_onesphere['Y']=np.array([24])
df_onesphere['Z']=np.array([25])
df_onesphere['R']=np.array([14])

# Bug 1
try:
    packing_sfc_onesphere=ps.generators.spheres_from_coords(df_onesphere,smooth=True,mode='contained')
except IndexError as inst:
    print(f'Got IndexError: {inst.args}')

# Bug  2
df_spheresInplane={}
df_spheresInplane['X']=np.array([23,23,23])
df_spheresInplane['Y']=np.array([24,23,26])
df_spheresInplane['Z']=np.array([25,26,23])
df_spheresInplane['R']=np.array([14,14,14])
packing_sfc_inplane=ps.generators.spheres_from_coords(df_spheresInplane,smooth=True,mode='contained')
print(f'Shape : {packing_sfc_inplane.shape}')

[jgostick]

Is this issue also fixed by the PR #932 ?

[heinsimon]

Is this issue also fixed by the PR #932 ?

I do not think so, since the fix in PR #932 is within the function points_to_spheres and not within the function spheres_from_coords.