# Latest

**URL:** https://discourse.vtk.org/latest.md?page=238

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

**Page:** 239

---

## [Perplexing Problem with Annotation Overwriting Itself When No External Monitors](https://discourse.vtk.org/t/perplexing-problem-with-annotation-overwriting-itself-when-no-external-monitors/1720)

<div class="topic-metadata">

**Author:** [@MichelleKline](https://discourse.vtk.org/u/MichelleKline)\
**Replies:** 2\
**Last updated:** [September 9, 2019, 8:48pm UTC](https://discourse.vtk.org/t/perplexing-problem-with-annotation-overwriting-itself-when-no-external-monitors/1720 "2019-09-09T20:48:22Z")

</div>

Hello, I am using vtkCornerAnnotation to display image coordinates as the user moves the mouse over an image in the vtkRenderWindow. It works nicely when I have an two external monitors connected to my Windows laptop. …

---

## [Supercomputing 2019 - Kitware wants to promote your work!](https://discourse.vtk.org/t/supercomputing-2019-kitware-wants-to-promote-your-work/1713)

<div class="topic-metadata">

**Author:** [@Dave\_DeMarle](https://discourse.vtk.org/u/Dave_DeMarle)\
**Replies:** 2\
**Last updated:** [September 9, 2019, 5:07pm UTC](https://discourse.vtk.org/t/supercomputing-2019-kitware-wants-to-promote-your-work/1713 "2019-09-09T17:07:12Z")

</div>

Kitware would like to show your compelling images, videos, and entire applications enabled by VTK and ParaView at our booth at this year’s Supercomputing conference. For a sample of what we demonstrated before, check out…

---

## [ADIOS failures on taanab](https://discourse.vtk.org/t/adios-failures-on-taanab/1633)

<div class="topic-metadata">

**Author:** [@utkarshayachit](https://discourse.vtk.org/u/utkarshayachit)\
**Replies:** 4\
**Last updated:** [September 9, 2019, 3:03pm UTC](https://discourse.vtk.org/t/adios-failures-on-taanab/1633 "2019-09-09T15:03:49Z")

</div>

VTK::IOADIOS2Cxx-TestIOADIOS2VTX\_VTI3D is failing on taanab for several days now. Is anyone tracking it down?

---

## [Change color of poly inside an imperfect surface.](https://discourse.vtk.org/t/change-color-of-poly-inside-an-imperfect-surface/1719)

<div class="topic-metadata">

**Author:** [@bruce.bogtrotter](https://discourse.vtk.org/u/bruce.bogtrotter)\
**Replies:** 1\
**Last updated:** [September 8, 2019, 10:47am UTC](https://discourse.vtk.org/t/change-color-of-poly-inside-an-imperfect-surface/1719 "2019-09-08T10:47:08Z")

</div>

I’m trying to find the best way of changing color of polydata that has penetrated the surface of an (unperfectly closed) object. for example, if I have a foam football (with holes in it/imperefectly closed surface), and…

---

## [DICOM MRI Multiplanar Reformation (MPR) using vtkImageReslice](https://discourse.vtk.org/t/dicom-mri-multiplanar-reformation-mpr-using-vtkimagereslice/1626)

<div class="topic-metadata">

**Author:** [@MichelleKline](https://discourse.vtk.org/u/MichelleKline)\
**Replies:** 2\
**Last updated:** [September 6, 2019, 9:46pm UTC](https://discourse.vtk.org/t/dicom-mri-multiplanar-reformation-mpr-using-vtkimagereslice/1626 "2019-09-06T21:46:36Z")

</div>

Hello, I am new to VTK. I’m stuck on a problem and could really use some advice. I am writing a small program to perform multiplanar reformation (MPR) on a DICOM. I’ve read many forums, Q&As (@dgobbi) and examples. A…

---

## [Retrieve information about a netCDF file (measure units)](https://discourse.vtk.org/t/retrieve-information-about-a-netcdf-file-measure-units/1715)

<div class="topic-metadata">

**Author:** [@lorenzocelli](https://discourse.vtk.org/u/lorenzocelli)\
**Replies:** 0\
**Last updated:** [September 6, 2019, 5:14pm UTC](https://discourse.vtk.org/t/retrieve-information-about-a-netcdf-file-measure-units/1715 "2019-09-06T17:14:57Z")

</div>

Hello! I’m very new to VTK and I have a stupid question about the netCDFCF reader. I have a .nc file (you can download it here: https://drive.google.com/file/d/174F6fmasQFZXVWV9xMqOZKR5qyRlrAm6/view?usp=sharing ) and I w…

---

## [Dr. Donald Lindberg, 85, Dies](https://discourse.vtk.org/t/dr-donald-lindberg-85-dies/1686)

<div class="topic-metadata">

**Author:** [@lorensen](https://discourse.vtk.org/u/lorensen)\
**Replies:** 2\
**Last updated:** [September 6, 2019, 1:35pm UTC](https://discourse.vtk.org/t/dr-donald-lindberg-85-dies/1686 "2019-09-06T13:35:55Z")

</div>

Friends, I am sad to report that Dr. Donald Lindberg, past Director of the National Library of Medicine, has passed away. Dr. Lindberg was an exceptional visionary who saw the need for computers in medicine many years a…

---

## [how to mirror the image?](https://discourse.vtk.org/t/how-to-mirror-the-image/1707)

<div class="topic-metadata">

**Author:** [@pingdan](https://discourse.vtk.org/u/pingdan)\
**Replies:** 1\
**Last updated:** [September 6, 2019, 6:59am UTC](https://discourse.vtk.org/t/how-to-mirror-the-image/1707 "2019-09-06T06:59:35Z")

</div>

m\_Renderer-\>GetActiveCamera()-\>SetViewUp(0, 0, -1); I set the camera by SetViewUp(), and now I want to exchange the image left and right. I mean I want to mirror the image along red line. how can I set camera, which …

---

## [Does vti (vtkImageData) only support 1channel?](https://discourse.vtk.org/t/does-vti-vtkimagedata-only-support-1channel/1687)

<div class="topic-metadata">

**Author:** [@rjsgml5698](https://discourse.vtk.org/u/rjsgml5698)\
**Replies:** 2\
**Last updated:** [September 5, 2019, 3:11pm UTC](https://discourse.vtk.org/t/does-vti-vtkimagedata-only-support-1channel/1687 "2019-09-05T15:11:25Z")

</div>

Hello I have a question. Does vti(vtkImageData) only support 1channel? only greyscale? Thank you

---

## [VTK 9 release date ?](https://discourse.vtk.org/t/vtk-9-release-date/1701)

<div class="topic-metadata">

**Author:** [@simonesneault](https://discourse.vtk.org/u/simonesneault)\
**Replies:** 1\
**Last updated:** [September 5, 2019, 3:04pm UTC](https://discourse.vtk.org/t/vtk-9-release-date/1701 "2019-09-05T15:04:54Z")

</div>

Hello, Is there an expected release date for the upcoming VTK 9.0 ? Thanks

---

## [How to update in real time the vtkActor image](https://discourse.vtk.org/t/how-to-update-in-real-time-the-vtkactor-image/1705)

<div class="topic-metadata">

**Author:** [@james](https://discourse.vtk.org/u/james)\
**Replies:** 0\
**Last updated:** [September 5, 2019, 11:55am UTC](https://discourse.vtk.org/t/how-to-update-in-real-time-the-vtkactor-image/1705 "2019-09-05T11:55:31Z")

</div>

I want update in real time the vtkActor form the video capture , thanks for you help!

---

## [Synchronize two windows](https://discourse.vtk.org/t/synchronize-two-windows/1703)

<div class="topic-metadata">

**Author:** [@1111](https://discourse.vtk.org/u/1111)\
**Replies:** 0\
**Last updated:** [September 5, 2019, 10:47am UTC](https://discourse.vtk.org/t/synchronize-two-windows/1703 "2019-09-05T10:47:34Z")

</div>

Hi, Currently, we are creating a program that displays the display in vtkImplicitPlaneWidget2 and the plane in vtkImplicitPlaneWidget2 in two dimensions. The display was successful in the two windows. However, when a …

---

## [vtkimagereslice with vtkimageslab very slow when thickness](https://discourse.vtk.org/t/vtkimagereslice-with-vtkimageslab-very-slow-when-thickness/1629)

<div class="topic-metadata">

**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\
**Replies:** 7\
**Last updated:** [September 4, 2019, 4:00pm UTC](https://discourse.vtk.org/t/vtkimagereslice-with-vtkimageslab-very-slow-when-thickness/1629 "2019-09-04T16:00:53Z")

</div>

Hi everybody, I am making a curve surface reconstruction successfully with vtkimagereslice and appending every output of the curve to the final image (for each 2 points of the curve i reslice). I use that to obtain a pa…

---

## [calculate the center of mass incorrectly after clipping polydata](https://discourse.vtk.org/t/calculate-the-center-of-mass-incorrectly-after-clipping-polydata/1691)

<div class="topic-metadata">

**Author:** [@Matthijs\_Hendriks](https://discourse.vtk.org/u/Matthijs_Hendriks)\
**Replies:** 2\
**Last updated:** [September 4, 2019, 2:09pm UTC](https://discourse.vtk.org/t/calculate-the-center-of-mass-incorrectly-after-clipping-polydata/1691 "2019-09-04T14:09:00Z")

</div>

The center of mass is calculate not correctly after clipping a polydata. I get the center of mass of the original polydata

---

## [Bug with scene coordinates of mouse events](https://discourse.vtk.org/t/bug-with-scene-coordinates-of-mouse-events/1688)

<div class="topic-metadata">

**Author:** [@e-kolosov](https://discourse.vtk.org/u/e-kolosov)\
**Replies:** 0\
**Last updated:** [September 4, 2019, 8:11am UTC](https://discourse.vtk.org/t/bug-with-scene-coordinates-of-mouse-events/1688 "2019-09-04T08:11:05Z")

</div>

Hello. The method vtkContextMouseEvent::GetScenePos() return a screen position instead a scene position. I think that the reason of this bug placed at the method vtkContextScene::EventCopy but I could not fix it in a s…

---

## [Display slice plane](https://discourse.vtk.org/t/display-slice-plane/1546)

<div class="topic-metadata">

**Author:** [@1111](https://discourse.vtk.org/u/1111)\
**Replies:** 14\
**Last updated:** [September 4, 2019, 2:31am UTC](https://discourse.vtk.org/t/display-slice-plane/1546 "2019-09-04T02:31:30Z")

</div>

Hi, I want to display the slice plane selected by vtkImplicitPlaneWidget2 as a two-dimensional image while synchronizing in another window. Can you tell me how to display while synchronizing? The code to reslice was c…

---

## [Problem about revolution and rotation(just like earth and sun) using Actor-\>SetOrigin(X,Y,Z)](https://discourse.vtk.org/t/problem-about-revolution-and-rotation-just-like-earth-and-sun-using-actor-setorigin-x-y-z/1679)

<div class="topic-metadata">

**Author:** [@xjtu\_lxj](https://discourse.vtk.org/u/xjtu_lxj)\
**Replies:** 3\
**Last updated:** [September 4, 2019, 3:56am UTC](https://discourse.vtk.org/t/problem-about-revolution-and-rotation-just-like-earth-and-sun-using-actor-setorigin-x-y-z/1679 "2019-09-04T03:56:39Z")

</div>

I am working on a school project about using VTK to draw a roller bearing. As you know, when the bearing is rotating, the roller is similar to pure rolling, it can be shown as rotation and revolution of the roller around…

---

## [Box clip with vtkTableBasedClipDataSet and sharp edges?](https://discourse.vtk.org/t/box-clip-with-vtktablebasedclipdataset-and-sharp-edges/1286)

<div class="topic-metadata">

**Author:** [@banesullivan](https://discourse.vtk.org/u/banesullivan)\
**Replies:** 6\
**Last updated:** [September 3, 2019, 8:56pm UTC](https://discourse.vtk.org/t/box-clip-with-vtktablebasedclipdataset-and-sharp-edges/1286 "2019-09-03T20:56:02Z")

</div>

The vtkBoxClipDataSet is great, however, it produces a triangulated mesh outside of the clipping box much like the vtkClipDataSet filter as discussed in the thread: https://discourse.vtk.org/t/is-it-possible-to-turn-off-…

---

## [Attribute error in getting dimensions of list to write to a csv](https://discourse.vtk.org/t/attribute-error-in-getting-dimensions-of-list-to-write-to-a-csv/1648)

<div class="topic-metadata">

**Author:** [@tejas.canchi](https://discourse.vtk.org/u/tejas.canchi)\
**Replies:** 1\
**Last updated:** [September 3, 2019, 8:18pm UTC](https://discourse.vtk.org/t/attribute-error-in-getting-dimensions-of-list-to-write-to-a-csv/1648 "2019-09-03T20:18:19Z")

</div>

I am trying to write a list that has been processed on flow image data to write to a CSV. I am getting the following error. Does anyone have any leads? return list(self.vtsData.GetDimensions()) AttributeError: ‘vtkComm…

---

## [vtkResampleToImage](https://discourse.vtk.org/t/vtkresampletoimage/1671)

<div class="topic-metadata">

**Author:** [@paul-bd](https://discourse.vtk.org/u/paul-bd)\
**Replies:** 4\
**Last updated:** [September 3, 2019, 8:06pm UTC](https://discourse.vtk.org/t/vtkresampletoimage/1671 "2019-09-03T20:06:28Z")

</div>

Hi ! I aim trying to voxelize in python a 3D mesh of tetrahedron elements stored as a vtk unstructured grid (produced by tetgen) where I would like that each elements be graduatly incremented (numbered from 1 to n\_cells…

---

## [about moving camera without rotating the vtkVolume](https://discourse.vtk.org/t/about-moving-camera-without-rotating-the-vtkvolume/1680)

<div class="topic-metadata">

**Author:** [@Moun](https://discourse.vtk.org/u/Moun)\
**Replies:** 0\
**Last updated:** [September 3, 2019, 10:01am UTC](https://discourse.vtk.org/t/about-moving-camera-without-rotating-the-vtkvolume/1680 "2019-09-03T10:01:53Z")

</div>

Hello, I would like to know if it is possible to move the camera without rotating the actor? I used and it doesn’t work correctly? Also, I would like to range the position of vtkVolume. I fixed the position but when w…

---

## [Switched from OpenGL to OpenGL2, rescaling of vtkTextActor stopped working](https://discourse.vtk.org/t/switched-from-opengl-to-opengl2-rescaling-of-vtktextactor-stopped-working/1678)

<div class="topic-metadata">

**Author:** [@michael23](https://discourse.vtk.org/u/michael23)\
**Replies:** 0\
**Last updated:** [September 2, 2019, 2:54pm UTC](https://discourse.vtk.org/t/switched-from-opengl-to-opengl2-rescaling-of-vtktextactor-stopped-working/1678 "2019-09-02T14:54:42Z")

</div>

Hi, after re-compiling VTK 7.1 from OpenGL to OpenGL2, the rescaling of vtkTextActor stopped working. The size of the text stays the same despite of the viewport/window size. vtkSmartPointer textActor = vtkSmartPointe…

---

## [All dashboards broken](https://discourse.vtk.org/t/all-dashboards-broken/1669)

<div class="topic-metadata">

**Author:** [@mwestphal](https://discourse.vtk.org/u/mwestphal)\
**Replies:** 4\
**Last updated:** [September 2, 2019, 6:23am UTC](https://discourse.vtk.org/t/all-dashboards-broken/1669 "2019-09-02T06:23:55Z")

</div>

Somehow, it looks like all dashboards are broken, but only with MRs. See here : https://gitlab.kitware.com/vtk/vtk/merge\_requests/5919 https://gitlab.kitware.com/vtk/vtk/merge\_requests/5682 https://gitlab.kitware.com…

---

## [Eye-Dome Lighting: vtkEDLShading (example request)](https://discourse.vtk.org/t/eye-dome-lighting-vtkedlshading-example-request/508)

<div class="topic-metadata">

**Author:** [@banesullivan](https://discourse.vtk.org/u/banesullivan)\
**Replies:** 6\
**Last updated:** [September 1, 2019, 7:05pm UTC](https://discourse.vtk.org/t/eye-dome-lighting-vtkedlshading-example-request/508 "2019-09-01T19:05:38Z")

</div>

Could someone share an example of how to use the vtkEDLShading class in VTK? This is commonly used in ParaView but I can’t seem to find any examples using it in pure-VTK. Any help would be much appreciated!

---

## [Drawing a collection of variable length fixed radius cylinders](https://discourse.vtk.org/t/drawing-a-collection-of-variable-length-fixed-radius-cylinders/1602)

<div class="topic-metadata">

**Author:** [@noamb](https://discourse.vtk.org/u/noamb)\
**Replies:** 2\
**Last updated:** [August 30, 2019, 2:12pm UTC](https://discourse.vtk.org/t/drawing-a-collection-of-variable-length-fixed-radius-cylinders/1602 "2019-08-30T14:12:47Z")

</div>

I want to draw a collection of variable length fixed radius fixed color cylinders, and I want to be able to pick them. I’ve been trying to do it via glyphs, but each glyph object type I’ve tried fails in a different way…

---

## [picking glyphs vtkGlyph3DMapper](https://discourse.vtk.org/t/picking-glyphs-vtkglyph3dmapper/1618)

<div class="topic-metadata">

**Author:** [@noamb](https://discourse.vtk.org/u/noamb)\
**Replies:** 4\
**Last updated:** [August 30, 2019, 2:11pm UTC](https://discourse.vtk.org/t/picking-glyphs-vtkglyph3dmapper/1618 "2019-08-30T14:11:31Z")

</div>

Can anyone suggest what’s the right picker to use for finding out the top-most glyph at a glyph from a vtkGlyph3DMapper? I tried to use vtkCellPicker, but it never seems to return any hits from the glyphs, only from oth…

---

## [vtkXOpenGLRenderWindow error](https://discourse.vtk.org/t/vtkxopenglrenderwindow-error/1668)

<div class="topic-metadata">

**Author:** [@rajaya](https://discourse.vtk.org/u/rajaya)\
**Replies:** 1\
**Last updated:** [August 30, 2019, 3:28am UTC](https://discourse.vtk.org/t/vtkxopenglrenderwindow-error/1668 "2019-08-30T03:28:43Z")

</div>

When I launch mayavi2 I get the following error message: ERROR: In /work/standalone-x64-build/VTK-source/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx, line 797 vtkXOpenGLRenderWindow (0x558dd837c070): GL version 2.1 wit…

---

## [why the slice cursor move back to the center?](https://discourse.vtk.org/t/why-the-slice-cursor-move-back-to-the-center/1664)

<div class="topic-metadata">

**Author:** [@pingdan](https://discourse.vtk.org/u/pingdan)\
**Replies:** 1\
**Last updated:** [August 30, 2019, 2:58am UTC](https://discourse.vtk.org/t/why-the-slice-cursor-move-back-to-the-center/1664 "2019-08-30T02:58:02Z")

</div>

my steps: at the upper right view, move the red cursor line from center to right. 2.at he upper left view, I change the slice along z axis through mousewheel backward or forward. but the red line automatic move to cen…

---

## [Reslice of ImageData and glyph3D arrows](https://discourse.vtk.org/t/reslice-of-imagedata-and-glyph3d-arrows/1617)

<div class="topic-metadata">

**Author:** [@Louis](https://discourse.vtk.org/u/Louis)\
**Replies:** 18\
**Last updated:** [August 29, 2019, 7:37am UTC](https://discourse.vtk.org/t/reslice-of-imagedata-and-glyph3d-arrows/1617 "2019-08-29T07:37:27Z")

</div>

Hi everyone, I got a issue with my VTK pipeline but i don’t understand what did i do wrong. Currently I want to display an image of a 3D volume and on this image I want some 3D glyph arrows. But when I display it, any…

---

## [Constrain vtkDelaunay2D](https://discourse.vtk.org/t/constrain-vtkdelaunay2d/1609)

<div class="topic-metadata">

**Author:** [@danielmcquillen](https://discourse.vtk.org/u/danielmcquillen)\
**Replies:** 6\
**Last updated:** [August 28, 2019, 10:28pm UTC](https://discourse.vtk.org/t/constrain-vtkdelaunay2d/1609 "2019-08-28T22:28:10Z")

</div>

I’m attempting to use VTK to visualize heat transfer through a window frame cross section shaped like this: The examples for constraining a vtkDelaunay2D all show how to essentially punch a hole out of the generated m…

[Previous page](https://discourse.vtk.org/latest.md?page=237)

[Next page](https://discourse.vtk.org/latest.md?page=239)