# Latest

**URL:** https://discourse.vtk.org/latest.md?page=104

[Latest](https://discourse.vtk.org/latest.md) · [Categories](https://discourse.vtk.org/categories.md) · [Tags](https://discourse.vtk.org/tags.md)

**Page:** 105

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## [Iso Volume Filter for VTK](https://discourse.vtk.org/t/iso-volume-filter-for-vtk/10316)

<div class="topic-metadata">

**Author:** [@Jimmy-KL](https://discourse.vtk.org/u/Jimmy-KL)\
**Replies:** 0\
**Last updated:** [December 27, 2022, 3:43am UTC](https://discourse.vtk.org/t/iso-volume-filter-for-vtk/10316 "2022-12-27T03:43:19Z")

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Is there a Iso Volume filter for VTK? I usually use this filter in Paraview for my work, but I didn’t find such filter in VTK python interface. If there is no Iso Volume filter in VTK, I think there maybe a filter pipel…

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## [is there a way to write to csv file when there is more than 1 table](https://discourse.vtk.org/t/is-there-a-way-to-write-to-csv-file-when-there-is-more-than-1-table/10279)

<div class="topic-metadata">

**Author:** [@we\_create](https://discourse.vtk.org/u/we_create)\
**Replies:** 2\
**Last updated:** [December 27, 2022, 2:46am UTC](https://discourse.vtk.org/t/is-there-a-way-to-write-to-csv-file-when-there-is-more-than-1-table/10279 "2022-12-27T02:46:03Z")

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Hi all, I have a question regarding writing to csv file. In my program there are more than 1 table.Is there any way to write all the table data into one csv file.

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## [Error while trying to use \`vtk\_to\_numpy\`](https://discourse.vtk.org/t/error-while-trying-to-use-vtk-to-numpy/10290)

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**Author:** [@Deepa](https://discourse.vtk.org/u/Deepa)\
**Replies:** 2\
**Last updated:** [December 26, 2022, 7:19am UTC](https://discourse.vtk.org/t/error-while-trying-to-use-vtk-to-numpy/10290 "2022-12-26T07:19:56Z")

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Hi All, I am trying to run the following example (K3D-jupyter/volume\_renderer.ipynb at 3fef1ea419a84a51c8aed56cb285b9fcf0a18c9a · K3D-tools/K3D-jupyter · GitHub) in jupyter notebook. import k3d import math import numpy…

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## [Intel oneTBB's flow\_graph and VTK's executive](https://discourse.vtk.org/t/intel-onetbbs-flow-graph-and-vtks-executive/10311)

<div class="topic-metadata">

**Author:** [@Nicholas\_Yue](https://discourse.vtk.org/u/Nicholas_Yue)\
**Replies:** 0\
**Last updated:** [December 26, 2022, 2:26am UTC](https://discourse.vtk.org/t/intel-onetbbs-flow-graph-and-vtks-executive/10311 "2022-12-26T02:26:10Z")

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I am considering using oneTBB’s flow\_graph as a framework for a dependency graph I am building. The grunt work done in the oneTBB nodes are performed via VTK code (mostly vtkAlogrithm derived classes) Will there be arc…

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## [Link disappears when attempting to move it](https://discourse.vtk.org/t/link-disappears-when-attempting-to-move-it/9036)

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**Author:** [@astrid-d](https://discourse.vtk.org/u/astrid-d)\
**Replies:** 4\
**Last updated:** [December 23, 2022, 2:22am UTC](https://discourse.vtk.org/t/link-disappears-when-attempting-to-move-it/9036 "2022-12-23T02:22:46Z")

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Hello, I’m completely new to vtk.js and I’m trying to model an industrial robot. I have added sliders with eventlisteners so that each link of the robot can rotate by dragging the slider. It works for most links, while s…

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## [How to update the scalar range for evolving scalar values in a pipeline?](https://discourse.vtk.org/t/how-to-update-the-scalar-range-for-evolving-scalar-values-in-a-pipeline/10277)

<div class="topic-metadata">

**Author:** [@scotsman60](https://discourse.vtk.org/u/scotsman60)\
**Replies:** 3\
**Last updated:** [December 22, 2022, 7:45pm UTC](https://discourse.vtk.org/t/how-to-update-the-scalar-range-for-evolving-scalar-values-in-a-pipeline/10277 "2022-12-22T19:45:20Z")

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Hello!!! I have a fairly standard pipeline, the key piece of which is represented by the fragment below consisting of a vtkUnstructuredGrid (“data” below), a mapper and lookup table. The vtkUnstructuredGrid has multipl…

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## [Diverging Log Lookup Table](https://discourse.vtk.org/t/diverging-log-lookup-table/10216)

<div class="topic-metadata">

**Author:** [@BlueKnight7](https://discourse.vtk.org/u/BlueKnight7)\
**Replies:** 7\
**Last updated:** [December 22, 2022, 2:12pm UTC](https://discourse.vtk.org/t/diverging-log-lookup-table/10216 "2022-12-22T14:12:30Z")

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This question is prompted from the MakeLUT function in the DisplacementPlot example: https://kitware.github.io/vtk-examples/site/Cxx/VisualizationAlgorithms/DisplacementPlot/ The MakeLUT function shows how to generate …

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## [ICP not stitching point cloud together](https://discourse.vtk.org/t/icp-not-stitching-point-cloud-together/10293)

<div class="topic-metadata">

**Author:** [@Joe\_Rockclimber](https://discourse.vtk.org/u/Joe_Rockclimber)\
**Replies:** 2\
**Last updated:** [December 22, 2022, 3:39am UTC](https://discourse.vtk.org/t/icp-not-stitching-point-cloud-together/10293 "2022-12-22T03:39:44Z")

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I have 1 scan. I have split the scan into 2 point clouds that have about 10 percent overlap. I offset one point cloud by .5 units in the X direction. I am trying to use the icp object to put the point clouds back togethe…

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## [Visualizing Unstructured Grids](https://discourse.vtk.org/t/visualizing-unstructured-grids/9203)

<div class="topic-metadata">

**Author:** [@BlueKnight7](https://discourse.vtk.org/u/BlueKnight7)\
**Replies:** 4\
**Last updated:** [December 21, 2022, 7:21pm UTC](https://discourse.vtk.org/t/visualizing-unstructured-grids/9203 "2022-12-21T19:21:13Z")

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I just started working with the vtkUnstructuredGrid class and have built a simple sphere using VTK\_HEXAHEDRON elements. When the sphere is rendered, only the exterior surfaces are displayed. This is evident when I pres…

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## [How is vtkCursor2D supposed to be used?](https://discourse.vtk.org/t/how-is-vtkcursor2d-supposed-to-be-used/10225)

<div class="topic-metadata">

**Author:** [@scotsman60](https://discourse.vtk.org/u/scotsman60)\
**Replies:** 6\
**Last updated:** [December 21, 2022, 5:25pm UTC](https://discourse.vtk.org/t/how-is-vtkcursor2d-supposed-to-be-used/10225 "2022-12-21T17:25:10Z")

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Hello!! I want to use a cross hair cursor with configurable “aperture” (pick radius) in my app. I found vtkCursor2D and the example, converted the example to Python and ran it. vtkCursor2D gives me the shape I want and …

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## [Installing VTK in Ubuntu 18.04](https://discourse.vtk.org/t/installing-vtk-in-ubuntu-18-04/2147)

<div class="topic-metadata">

**Author:** [@banikr](https://discourse.vtk.org/u/banikr)\
**Replies:** 25\
**Last updated:** [December 21, 2022, 11:31am UTC](https://discourse.vtk.org/t/installing-vtk-in-ubuntu-18-04/2147 "2022-12-21T11:31:08Z")

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Hello I am following this link: VTK/Building/Linux - KitwarePublic to install VTK in my system. But having a lot of troubles while doing that. According to them, I downloaded the VTK-6.3.0.zip Version(as the latest one …

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## [Same API returned pointer pointed to diffent array location after printing.](https://discourse.vtk.org/t/same-api-returned-pointer-pointed-to-diffent-array-location-after-printing/10284)

<div class="topic-metadata">

**Author:** [@AlexLuya](https://discourse.vtk.org/u/AlexLuya)\
**Replies:** 1\
**Last updated:** [December 21, 2022, 11:25am UTC](https://discourse.vtk.org/t/same-api-returned-pointer-pointed-to-diffent-array-location-after-printing/10284 "2022-12-21T11:25:52Z")

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Hello,I have a code piece like blew to print same returned vtkDataArray twice: //get the normal of the representative cell auto normal = obj-\>cellNormals()-\>GetTuple(reprenstiveCell.id); std::cout \<\< "Repre Cell Nor…

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## [vtkOBJReader - use material string break reader handling of UV](https://discourse.vtk.org/t/vtkobjreader-use-material-string-break-reader-handling-of-uv/10276)

<div class="topic-metadata">

**Author:** [@Nicholas\_Yue](https://discourse.vtk.org/u/Nicholas_Yue)\
**Replies:** 0\
**Last updated:** [December 20, 2022, 10:42pm UTC](https://discourse.vtk.org/t/vtkobjreader-use-material-string-break-reader-handling-of-uv/10276 "2022-12-20T22:42:14Z")

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I have noticed OBJ with the following types of string in them will break the OBJ reader mtllib mesh.mtl usemtl material0000 usemtl material0001 usemtl material0002 usemtl material0003 usemtl material0004 The points pos…

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## [Get the data from vtkAlgorithmOutput](https://discourse.vtk.org/t/get-the-data-from-vtkalgorithmoutput/10252)

<div class="topic-metadata">

**Author:** [@Neo](https://discourse.vtk.org/u/Neo)\
**Replies:** 3\
**Last updated:** [December 20, 2022, 8:16pm UTC](https://discourse.vtk.org/t/get-the-data-from-vtkalgorithmoutput/10252 "2022-12-20T20:16:52Z")

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I applied the marching cubes algorithm on a volume. The output is a vtkAlgorithmOutput (output\_port variable) as shown by the following code. I want to extract the actual points (locations inside the volume coordinates) …

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## [Hierarchical Mouse Events](https://discourse.vtk.org/t/hierarchical-mouse-events/10189)

<div class="topic-metadata">

**Author:** [@llobera](https://discourse.vtk.org/u/llobera)\
**Replies:** 4\
**Last updated:** [December 20, 2022, 2:25pm UTC](https://discourse.vtk.org/t/hierarchical-mouse-events/10189 "2022-12-20T14:25:52Z")

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This is probably a simple question but I have not been able to figure it out. I want to be able to implement implement a hierarchical processing of mouse events. For instance, I would like to be able to press on the mid…

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## [vtkDynamic2DLabelMapper and vtkChartXY](https://discourse.vtk.org/t/vtkdynamic2dlabelmapper-and-vtkchartxy/10275)

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**Author:** [@manatee](https://discourse.vtk.org/u/manatee)\
**Replies:** 0\
**Last updated:** [December 20, 2022, 1:54pm UTC](https://discourse.vtk.org/t/vtkdynamic2dlabelmapper-and-vtkchartxy/10275 "2022-12-20T13:54:48Z")

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Hi all, how do you use labels (e.g. vtkDynamic2DLabelMapper) in vtkChartXY? I can render them, but they’re at the wrong positions. Do I need to apply a coordinate system or a transformation first? If so, how is it done…

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## [Qt + VTK RenderWindow ghosting](https://discourse.vtk.org/t/qt-vtk-renderwindow-ghosting/10250)

<div class="topic-metadata">

**Author:** [@Justin\_Weber](https://discourse.vtk.org/u/Justin_Weber)\
**Replies:** 1\
**Last updated:** [December 20, 2022, 11:28am UTC](https://discourse.vtk.org/t/qt-vtk-renderwindow-ghosting/10250 "2022-12-20T11:28:01Z")

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We are having issues with ghosting when another widget is visible on top of the render window. Specifically, we have QVTKRenderWindowInteractor widgets in tabs. When you go to a different tab, then back to a tab with the…

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## [WSLink launcher is not deleting services](https://discourse.vtk.org/t/wslink-launcher-is-not-deleting-services/10248)

<div class="topic-metadata">

**Author:** [@aji](https://discourse.vtk.org/u/aji)\
**Replies:** 3\
**Last updated:** [December 20, 2022, 4:51am UTC](https://discourse.vtk.org/t/wslink-launcher-is-not-deleting-services/10248 "2022-12-20T04:51:37Z")

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WSLink launcher is not deleting services. There is bug in code in following file web\_app.add\_routes( \[ aiohttp\_web.post(endpoint, launcher\_resource.handle\_post), aiohttp\_web.get(endpoint+'{id}', la…

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## [vtkweb for java](https://discourse.vtk.org/t/vtkweb-for-java/10244)

<div class="topic-metadata">

**Author:** [@mmXIO](https://discourse.vtk.org/u/mmXIO)\
**Replies:** 4\
**Last updated:** [December 20, 2022, 3:24am UTC](https://discourse.vtk.org/t/vtkweb-for-java/10244 "2022-12-20T03:24:09Z")

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Whether you can connect to a VTKWEB server via Java instead of Python？

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## [vtkActor.SetColor do not work for vtkContourFilter](https://discourse.vtk.org/t/vtkactor-setcolor-do-not-work-for-vtkcontourfilter/10238)

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**Author:** [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)\
**Replies:** 4\
**Last updated:** [December 19, 2022, 9:00am UTC](https://discourse.vtk.org/t/vtkactor-setcolor-do-not-work-for-vtkcontourfilter/10238 "2022-12-19T09:00:49Z")

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I have a binary mask, and I want to display the isoface. The special mask is zero for all pixel except that the intensity is one for two slice, for example import vtkmodules.all as vtk img = vtk.vtkImageData() img.Se…

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## [how to use remoteview?](https://discourse.vtk.org/t/how-to-use-remoteview/10182)

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**Author:** [@jane](https://discourse.vtk.org/u/jane)\
**Replies:** 9\
**Last updated:** [December 18, 2022, 5:40pm UTC](https://discourse.vtk.org/t/how-to-use-remoteview/10182 "2022-12-18T17:40:31Z")

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Can remoteview call the regenerwindow generated by c++volume rendering? How to display the results of c++volume rendering on web pages through remoteview?

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## [NIFTI image to tensor/3d matrix representation](https://discourse.vtk.org/t/nifti-image-to-tensor-3d-matrix-representation/10237)

<div class="topic-metadata">

**Author:** [@genzo](https://discourse.vtk.org/u/genzo)\
**Replies:** 5\
**Last updated:** [December 18, 2022, 12:12am UTC](https://discourse.vtk.org/t/nifti-image-to-tensor-3d-matrix-representation/10237 "2022-12-18T00:12:17Z")

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I need to apply a FFT on a 3D image (.nii.gz .nii files). Therefore I’d need a 3D/4D tensor representation of the vtkNIFTIImageReader in some way. I’ve found this, but having a tensor for each cell I think is not effici…

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## [use vtk.js](https://discourse.vtk.org/t/use-vtk-js/10221)

<div class="topic-metadata">

**Author:** [@jane](https://discourse.vtk.org/u/jane)\
**Replies:** 4\
**Last updated:** [December 17, 2022, 2:44am UTC](https://discourse.vtk.org/t/use-vtk-js/10221 "2022-12-17T02:44:19Z")

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BASE\_PATH is not defined

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## [Is it possible to use VTK9 with qt6 QRhi and QML ?](https://discourse.vtk.org/t/is-it-possible-to-use-vtk9-with-qt6-qrhi-and-qml/6946)

<div class="topic-metadata">

**Author:** [@Julienchz](https://discourse.vtk.org/u/Julienchz)\
**Replies:** 1\
**Last updated:** [December 16, 2022, 5:07pm UTC](https://discourse.vtk.org/t/is-it-possible-to-use-vtk9-with-qt6-qrhi-and-qml/6946 "2022-12-16T17:07:53Z")

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Hello everyone, I would like to make a small 3D viewer with VTK 9 in Qt6 with QML. I know that it is now possible to use the QRhi class to have an abstraction with classic APIs. Can this be used with VTK? There are very…

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## [QML Example](https://discourse.vtk.org/t/qml-example/7247)

<div class="topic-metadata">

**Author:** [@Michael\_Jackson](https://discourse.vtk.org/u/Michael_Jackson)\
**Replies:** 6\
**Last updated:** [December 16, 2022, 5:06pm UTC](https://discourse.vtk.org/t/qml-example/7247 "2022-12-16T17:06:26Z")

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Is there an example that uses the newer QML support besides the test cases? I’m having some issues getting a basic application (based off of the test applications) to actually run.

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## [How to use the ImplicitPlaneWidget2 inside QML?](https://discourse.vtk.org/t/how-to-use-the-implicitplanewidget2-inside-qml/2536)

<div class="topic-metadata">

**Author:** [@Synfony](https://discourse.vtk.org/u/Synfony)\
**Replies:** 4\
**Last updated:** [December 16, 2022, 5:04pm UTC](https://discourse.vtk.org/t/how-to-use-the-implicitplanewidget2-inside-qml/2536 "2022-12-16T17:04:53Z")

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Hi, I am using VTK render window inside a QML item (i.e. in a QtQuick application). Rendering is working fine for the ImplicitPlaneWidget2 as well as mouse interaction like mouse wheel, camera rotate etc. But I can’t e…

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## [Some bugs when use vtk in qml.(Use the official way )](https://discourse.vtk.org/t/some-bugs-when-use-vtk-in-qml-use-the-official-way/9650)

<div class="topic-metadata">

**Author:** [@edwardAllen](https://discourse.vtk.org/u/edwardAllen)\
**Replies:** 7\
**Last updated:** [December 16, 2022, 5:02pm UTC](https://discourse.vtk.org/t/some-bugs-when-use-vtk-in-qml-use-the-official-way/9650 "2022-12-16T17:02:01Z")

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Here are some bugs when use official demo quickVtkRenderwindow with qml. First : In qml file , QQuickVtkRenderer cannot in Rectangle ,like this : bug1.qml ... VTKRenderWindow { id: vtkwindow width…

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## [QML Rendering Problem](https://discourse.vtk.org/t/qml-rendering-problem/7820)

<div class="topic-metadata">

**Author:** [@ltylight](https://discourse.vtk.org/u/ltylight)\
**Replies:** 13\
**Last updated:** [December 16, 2022, 5:01pm UTC](https://discourse.vtk.org/t/qml-rendering-problem/7820 "2022-12-16T17:01:13Z")

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Hi, I use QT Qml as GUI framework and use VTK for 3D rendering. I tried QQuickVTKRenderWindow which is functional. However, I read the source code and it says ‘All the QtQuick element rendering is stacked visually above…

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## [what is \_\_BASE\_PATH\_\_?](https://discourse.vtk.org/t/what-is-base-path/10222)

<div class="topic-metadata">

**Author:** [@jane](https://discourse.vtk.org/u/jane)\
**Replies:** 2\
**Last updated:** [December 16, 2022, 3:56pm UTC](https://discourse.vtk.org/t/what-is-base-path/10222 "2022-12-16T15:56:22Z")

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BASE\_PATH

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## [select Self intersecting face in vtk](https://discourse.vtk.org/t/select-self-intersecting-face-in-vtk/10200)

<div class="topic-metadata">

**Author:** [@hye00525](https://discourse.vtk.org/u/hye00525)\
**Replies:** 2\
**Last updated:** [December 16, 2022, 8:58am UTC](https://discourse.vtk.org/t/select-self-intersecting-face-in-vtk/10200 "2022-12-16T08:58:30Z")

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Hello, I would like to check the presence or absence of self intersecting face in stl mesh using vtk. Is there a filter that can do this? Thank you. I look forward to your reply.

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