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Bug in examples/advanced/thinplate_grid.py?

See original GitHub issue

When running thinplate_grid.py, I have the following error. @marcomusy , could you have a look?

Python 3.7.3 (default, Mar 27 2019, 09:23:15) 
IPython 7.4.0 -- An enhanced Interactive Python. Type '?' for help.

from vtkplotter import *
import numpy as np

np.random.seed(2)

grids = []
for i in range(10):
    grids.append(Grid([0, 0, i / 10.0], resx=100, resy=100))
act = mergeActors(grids)  # merge grids into a single object

idxs = np.random.randint(0, act.N(), 10)  # pick 10 indexes

ptsource, pttarget = [], []
for i in idxs:
    ptold = act.getPoint(i) + np.random.randn(3) * 0.02
    ptsource.append(ptold)
    ptnew = ptold + [0, 0, np.random.randn(1) * 0.10]  # move in z
    pttarget.append(ptnew)

warped = thinPlateSpline(act, ptsource, pttarget)
warped.alpha(0.2).color("b")
# print(warped.getTransform())

apts = Points(ptsource, r=5, c="r")
arrs = Arrows(ptsource, pttarget)

show(warped, apts, arrs, Text(__doc__), axes=9, viewup="z", bg="w")

## -- End pasted text --
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-1-369e5917c20a> in <module>
    23 
    24 apts = Points(ptsource, r=5, c="r")
---> 25 arrs = Arrows(ptsource, pttarget)
    26 
    27 show(warped, apts, arrs, Text(__doc__), axes=9, viewup="z", bg="w")

/usr/local/lib/python3.7/site-packages/vtkplotter/shapes.py in Arrows(startPoints, endPoints, s, scale, c, alpha, res)
    584     arrg = Glyph(pts, arr.GetOutput(),
    585                  orientationArray=orients, scaleByVectorSize=True,
--> 586                  c=c, alpha=alpha)
    587     settings.collectable_actors.append(arrg)
    588     return arrg

/usr/local/lib/python3.7/site-packages/vtkplotter/shapes.py in Glyph(actor, glyphObj, orientationArray, scaleByVectorSize, c, alpha)
    192     gly.SetColorModeToColorByScalar()
    193 
--> 194     if orientationArray != "":
    195         gly.OrientOn()
    196         gly.SetScaleFactor(1)

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()