VTK | Mirror of Visualization Toolkit repository | Data Visualization library
kandi X-RAY | VTK Summary
kandi X-RAY | VTK Summary
VTK is an open-source software system for image processing, 3D graphics, volume rendering and visualization. VTK includes many advanced algorithms (e.g., surface reconstruction, implicit modeling, decimation) and rendering techniques (e.g., hardware-accelerated volume rendering, LOD control). VTK is used by academicians for teaching and research; by government research institutions such as Los Alamos National Lab in the US or CINECA in Italy; and by many commercial firms who use VTK to build or extend products. The origin of VTK is with the textbook "The Visualization Toolkit, an Object-Oriented Approach to 3D Graphics" originally published by Prentice Hall and now published by Kitware, Inc. (Third Edition ISBN 1-930934-07-6). VTK has grown (since its initial release in 1994) to a world-wide user base in the commercial, academic, and research communities.
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QUESTION
I compiled VTK in my RedHat 8.3 machine, and now when I want to compile an example in the /GUI/Qt/SimpleView with cmake I get the following error message when configuring:
...ANSWER
Answered 2022-Apr-10 at 14:46This looks like you did not set the VTK_MODULE_ENABLE_VTK_GuiSupportQt and VTK_MODULE_ENABLE_VTK_ViewsQt options to "YES" when running configure in CMake.
These options are not enabled by default, but they seem to be required by the example that you're trying to compile.
Don't worry, you shouldn't have to re-do everything now. To fix:
- Open the CMake GUI.
- Enter the folder where you built VTK in "Where to build the binaries".
- If it's not checked, set the "Advanced" checkbox (the required options are not visible otherwise).
- Set
VTK_MODULE_ENABLE_VTK_GuiSupportQtandVTK_MODULE_ENABLE_VTK_ViewsQtoptions to "YES" - Press "Configure", and wait for it to finish
- During Configuring, you might get an error, if CMake doesn't know how to find Qt; if so, enter the Qt5_DIR / Qt6_DIR, and press configure again.
- Press "Generate", and wait for it to finish
- Start the vtk build again (depends on what build tool you choose...)
- Try configuring the example again, now you should not see the error message anymore.
QUESTION
Currently, we are using Python's vtk wrapper and also Pyvista (a more pythonist vtk wrapper).
At some parts of the process we have some log lines from .cxx files:
...ANSWER
Answered 2022-Mar-18 at 08:54you have the vtkLogger class to manage your logs (I know, c++ docs but VTK has a lack of python doc).
e.g.:
QUESTION
I'm trying to use VTK's Delaunay3D() to get a minimal bounding surface on my data using the alphaShapes algorithm. The particular dataset I'm working on is generally toroidally- or cylindrically-shaped, so by my understanding I should be trying to find a value < 0 for alpha. The class, however, does not seem to be able to handle negative floats. This can be confirmed by this minimal example:
...ANSWER
Answered 2022-Mar-17 at 19:16It looks like your code is doing 3D Delaunay triangulation, not alpha shapes.
From the documentation for Delaunay3D:
For a non-zero alpha value, only verts, edges, faces, or tetra contained within the circumsphere (of radius alpha) will be output.
In this implementation of Delaunay triangulation, alpha is a radius that can't be negative.
Looks like VTK is silently changing it to 0 right here in the code: https://github.com/Kitware/VTK/blob/01f5cc18fd9f0c8e34a5de313d53d2178ff6e325/Filters/Core/vtkDelaunay3D.h#L129
The documentation also mentions explicitly that the "alpha" is not the same as the alpha in alpha shapes, it's merely means something similar.
(The notion of alpha value is derived from Edelsbrunner's work on "alpha shapes".) Note that a modification to alpha shapes enables output of combinations of tetrahedra, triangles, lines, and/or verts (see the boolean ivars AlphaTets, AlphaTris, AlphaLines, AlphaVerts).
I'm not a PhD in CS/Geometry so maybe I'm missing something, but it seems like that class is not really what you want.
So try setting alpha as something small and positive and if your data is toroidal it will probably give you what you want.
QUESTION
I'm having trouble with a VTK file I've created not being loaded by ParaView. The file looks ok and I can't seen any obvious errors but ParaView throws the following warnings when trying to view the data.
ANSWER
Answered 2022-Mar-06 at 14:30The answer for anyone who may come across this is rather trivial - the attribute should be NumberOfComponents. Note the capitalisation!
QUESTION
I need to make a graphical window with a Qt widget that allows to represent inside it a point cloud that I have previously loaded using the PLC library.
Here's what I have so far that doesn't work (I based it on tutorials and this answer).
I'm using:
- Ubuntu 20.04
- Qt Creator 5.15
- VTK 9.1
- PCL 1.12
The reason I am using QVTKOpenGLStereoWidget is that as far as I read both QVTKOpenGLWidget and QVTKWidget are no longer available or will be discontinued in future releases.
Test.pro ...ANSWER
Answered 2022-Feb-27 at 22:21I was finally able to find the solution to the problem so I am sharing it as an answer in case it could be useful for someone else.
pclTest_V0.proQUESTION
Im trying to utilize the vtk Python library to write out some unstructured grids to legacy .vtk format
I am able to create the geometry, cell data and point data no problem and write them out to vtk.
The problem I have is I want to add the functionality to take cell data and convert it to point data.
See below code:
...ANSWER
Answered 2022-Feb-21 at 03:37figured it out.. I had to actually pass the vtkUnstructuredGrid into the cell to point filter
QUESTION
I can't install vtk in python project with this command:
...ANSWER
Answered 2022-Jan-27 at 19:54Hey if you are using python 3.7 or greater, then trying using this command:
QUESTION
Context: Convert an .iges to .vtk.
I have the following equation Ax^2+Bxy+Cy^2+Dx+Ey+F=0 representing a conic section.
The parameters A~F are given. I want to find points on the conic section, so that I can connect them with lines, and make a mesh.
The reason I need the points instead of just using matplotlib Ellipse is because I'm creating a mesh not a plot.
It is in 3 dimension space, but I first get points on xy plane, and use affine transformation to send it to 3 dim.
Question: How do I find points given an implicit equation?
ANSWER
Answered 2021-Dec-02 at 21:42To avoid spending too much time on this, I wrote some code that seems to handle general ellipses. It can be expanded for other conics, depending on what is needed. The code takes in the coefficients of a general quadratic equation of an ellipse and a number of desired points to be generated on the ellipse and generates a set of points on the ellipse.
QUESTION
Main question : I would like to know if it is possible to move a point in one direction but keep the mesh in vtk-Python (see image below)
I am new to vtk and would like to know if something is possible and if it is, which function to use. (I will give the context under if someone have a more clever idea).
I am using the vtk library with python and came across a pb with the delaunay_2d meshing. I have a mesh that is mostly flat but with little variation
if you lunch this code, you will see that the meshing is really weird :
...ANSWER
Answered 2021-Nov-04 at 14:12Just overwrite the points after having created the triangulation with the flat point array:
QUESTION
I'm trying to compute the intersection between 3 geometries using VTK.
I've started with the BooleanOperationPolyDataFilter example and made minor tweaks such as:
Adding a third sphere:
...ANSWER
Answered 2021-Sep-12 at 09:35You might just be missing a call to Update() in the second step. The vtkBooleanOperationPolyDataFilter seems to be working fine, eg. (python):
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