Setting pointColors with custom colormaps

The results of the mesh_coloring.py example does not produce a colored man in the middle as would be expected, see image:

What I’d like to do is setting the colors per point of an polydata object based on my own colormap, so that I can define the scaling from min to max.

# myarr is a numpy float32 1D array with e.g. min=10, max = 20000
from vtkplotter import colorMap
r, g, b = colorMap(... name='jet', vmin=myarr.min(), vmax=myarr.max())

and somehow pass this to an actor:

man1.pointColors(myarr alpha=0.5, cmap=MyColormapAbove)

A working example would be very helpful.

[marcomusy]

sorry that’s not very clear to me, do you want to set colors to cell based on edge length, or color the edges? Is the snippet already the solution? (Indeed it is a very clever one to colorize lines!)

from vtkplotter import *
import numpy as np

sph = Sphere().cutWithPlane()

sPoints = np.zeros([sph.N(),3]) + [0.75, 0, 0.1]
ePoints = sph.coordinates()

rays = Lines(sPoints, ePoints)
rays.cellColors(mag(sPoints-ePoints), cmap="spring")
rays.show(bg="w", axes=2)

[unidesigner]

Indeed, there was an old version hiding which got imported first. Your example works now and I can control the colormap with the vmin/vmax as I wanted. Thanks.