Display a 3D image with vtk python

Question

I want to Display a 3D image with the vtk module python. The image was saved in .vti format. I wrote the following simple code but it does not work correctly. How i can fix that?

import vtk

file_name = 'Vug.vti'

# Read the source file.
reader = vtk.vtkNrrdReader()
reader.SetFileName(file_name)
reader.Update()  

# Map the image through the lookup table
color = vtk.vtkImageMapToColors()
#color.SetLookupTable(table)
color.SetInputConnection(reader.GetOutputPort())

# Display the image
actor = vtk.vtkImageActor()
actor.GetMapper().SetInputConnection(color.GetOutputPort())

renderer = vtk.vtkRenderer()
renderer.AddActor(actor)

window = vtk.vtkRenderWindow()
window.AddRenderer(renderer)

# Set up the interaction
interactor = vtk.vtkRenderWindowInteractor()
window.SetInteractor(interactor)
window.Render()

# Start interaction
interactor.Start()

Could you explain what is wrong with the code?

zabop
– zabop

2020-04-16 16:36:45 +00:00
Commented Apr 16, 2020 at 16:36 — zabop
– zabop, Commented Apr 16, 2020 at 16:36
It shows the image in 2D.

Abolfazl
– Abolfazl

2020-04-16 16:41:02 +00:00
Commented Apr 16, 2020 at 16:41 — Abolfazl
– Abolfazl, Commented Apr 16, 2020 at 16:41

Dave Chen · Accepted Answer · 2020-04-16 16:51:11Z

1

A vtkImageActor displays an image as a 2d object. If you want to render a 3d volume, you need to use a vtkVolume object.

This example shows how to volume render in VTK: https://github.com/Kitware/VTK/blob/master/Examples/VolumeRendering/Python/SimpleRayCast.py

answered Apr 16, 2020 at 16:51

Dave Chen

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Comments

Sorush · Accepted Answer · 2021-04-24 16:19:39Z

0

With vtkplotter this is simply:

from vtkplotter import load, datadir, show
vol = load(datadir + 'vase.vti') # returns vtkVolume
# set color and trasparency transfer functions along the scalar range
vol.color(["green", "pink", "blue"]).alpha([0, 0, 0.2, 0.5, 0.9])
show(vol)

edited Apr 24, 2021 at 16:19

Sorush

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answered Apr 16, 2020 at 19:35

mmusy

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