Upper envelope crashing (maybe only at low resolutions?)

[sgsellan]

This crashes, and it shouldn't. My current thinking is that the low resolution means there are labels that cause empty regions (e.g., labels with no associated tets). For example, I up-ed the resolution to 10, and that seems to run without issue.

import gpytoolbox, time
import numpy as np
 
labels = 4
resolution = 5
v, t = gpytoolbox.regular_cube_mesh(resolution)
w = np.zeros((v.shape[0],labels))
for i in range(labels):
    p = np.random.rand(3)
    print( "Center: ", p )
    for j in range(v.shape[0]):
        w[j,i] = -np.linalg.norm( v[j] - p )
 
print("Number of nodes: ", v.shape[0])
print("Number of labels: ", w.shape[1])
time_0 = time.time()
u, g, l = gpytoolbox.upper_envelope(v,t,w)
time_1 = time.time()
print("UE time: ", time_1-time_0)
print("Output tets: " , g.shape[0] )