I try to display thanks to vtk (python wrapper) several glyphs in a scene with each their own colour and rotation. Unfortunately, just the rotation (using vtkTensorGlyph) is taken in consideration by vtk. Reversely, just color is taken in consideration when I use a vtkGlyph3D. Here is a ready to use piece of code with a vtkTensorGlyph. Each cube should have a random color but there all will be in the same color. I read and read again the doc of vtk but I found no solution.

Thanks in advance for any idea

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import vtk
import scipy.linalg as sc
import random as ra
import numpy as np
import itertools

points = vtk.vtk.vtkPoints()  # where to locate each glyph in the scene
tensors = vtk.vtkDoubleArray() # rotation for each glyph
tensors.SetNumberOfComponents(9)
colors = vtk.vtkUnsignedCharArray() # should be the color for each glyph
colors.SetNumberOfComponents(3)

# let's make 10 cubes in the scene
for i in range(0, 50, 5): 
    points.InsertNextPoint(i, i, i) # position of a glyph
    colors.InsertNextTuple3(ra.randint(0, 255), ra.randint(0, 255), ra.randint(0, 255) ) # pick random color
    rot = list(itertools.chain(*np.reshape(sc.orth(np.random.rand(3, 3)).transpose(), (1, 9)).tolist())) # random rotation matrix (row major)
    tensors.InsertNextTuple9(*rot)

polydata = vtk.vtkPolyData() # create the polydatas
polydata.SetPoints(points) 
polydata.GetPointData().SetTensors(tensors)
polydata.GetPointData().SetScalars(colors)

cubeSource = vtk.vtkCubeSource()
cubeSource.Update()

glyphTensor = vtk.vtkTensorGlyph()
glyphTensor.SetColorModeToScalars() # is it really work ?

try:
    glyphTensor.SetInput(polydata)
except AttributeError:
    glyphTensor.SetInputData(polydata)

glyphTensor.SetSourceConnection(cubeSource.GetOutputPort())
glyphTensor.ColorGlyphsOn() # should not color all cubes independently ?
glyphTensor.ThreeGlyphsOff()
glyphTensor.ExtractEigenvaluesOff()
glyphTensor.Update()

# next is usual vtk code
mapper = vtk.vtkPolyDataMapper()
mapper.SetInputConnection(glyphTensor.GetOutputPort())

actor = vtk.vtkActor()
actor.SetMapper(mapper)

ren = vtk.vtkRenderer()
ren.SetBackground(0.2, 0.5, 0.3)
ren.AddActor(actor)

renwin = vtk.vtkRenderWindow()
renwin.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
iren.SetInteractorStyle(vtk.vtkInteractorStyleTrackballCamera())
iren.SetRenderWindow(renwin)

renwin.Render()
iren.Initialize()
renwin.Render()
iren.Start()