# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=131

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

**Page:** 132

---

## [Jacobian of B-spline coefficients](https://discourse.vtk.org/t/jacobian-of-b-spline-coefficients/3310)

<div class="topic-metadata">

**Author:** [@rijobro](https://discourse.vtk.org/u/rijobro)\
**Replies:** 4\
**Last updated:** [May 16, 2020, 10:52pm UTC](https://discourse.vtk.org/t/jacobian-of-b-spline-coefficients/3310 "2020-05-16T22:52:39Z")

</div>

For a motion-estimation algorithm, we’d like to be able to calculate the Jacboian of b-spline coefficients. Alternatively (and less computationally expensive), we’d like to be able to apply this Jacboian onto a pre-exist…

---

## [Remove 3 elements from vtkStringArray](https://discourse.vtk.org/t/remove-3-elements-from-vtkstringarray/3317)

<div class="topic-metadata">

**Author:** [@flaviu2](https://discourse.vtk.org/u/flaviu2)\
**Replies:** 2\
**Last updated:** [May 16, 2020, 10:34pm UTC](https://discourse.vtk.org/t/remove-3-elements-from-vtkstringarray/3317 "2020-05-16T22:34:31Z")

</div>

Is there any way to remove 3 elements from a vtkStringArray without clean up the array and load all elements except those 3 ? And, how can I delete all elements from array without Delete method and create another one ? …

---

## [VTK + PDAL for LIDAR data reading. Error with build](https://discourse.vtk.org/t/vtk-pdal-for-lidar-data-reading-error-with-build/3305)

<div class="topic-metadata">

**Author:** [@Oscar](https://discourse.vtk.org/u/Oscar)\
**Replies:** 3\
**Last updated:** [May 14, 2020, 9:59pm UTC](https://discourse.vtk.org/t/vtk-pdal-for-lidar-data-reading-error-with-build/3305 "2020-05-14T21:59:23Z")

</div>

Hello everyone, I’m trying to build VTK with the PDAL module and it seems that I’m doing something wrong. I downloaded and installed pdal through miniconda and set the PDAL\_DIR on CMake when building vtk. But the PDAL …

---

## [VTK 9 + Java on Mac](https://discourse.vtk.org/t/vtk-9-java-on-mac/3250)

<div class="topic-metadata">

**Author:** [@Marco](https://discourse.vtk.org/u/Marco)\
**Replies:** 41\
**Last updated:** [May 14, 2020, 2:45pm UTC](https://discourse.vtk.org/t/vtk-9-java-on-mac/3250 "2020-05-14T14:45:24Z")

</div>

Hello. I am trying to build VTK 9.0 with Java bindings on macOS 10.15.4 (latest). I am aware that there is a similar discussion on the “Development” forum (https://discourse.vtk.org/t/problem-with-java-bindings-in-vtk-…

---

## [Numpy to vtk](https://discourse.vtk.org/t/numpy-to-vtk/3306)

<div class="topic-metadata">

**Author:** [@RomyM](https://discourse.vtk.org/u/RomyM)\
**Replies:** 0\
**Last updated:** [May 14, 2020, 2:15pm UTC](https://discourse.vtk.org/t/numpy-to-vtk/3306 "2020-05-14T14:15:41Z")

</div>

Hello, I am able to visualize a volume in vtk of a 3D image using the mask function and volume rendering. I do have two visualizations: Correct visualized: Original image and binary masked image of expert (both import…

---

## [vtkOSPRayPass in Python](https://discourse.vtk.org/t/vtkospraypass-in-python/3304)

<div class="topic-metadata">

**Author:** [@akaszynski](https://discourse.vtk.org/u/akaszynski)\
**Replies:** 1\
**Last updated:** [May 14, 2020, 12:36pm UTC](https://discourse.vtk.org/t/vtkospraypass-in-python/3304 "2020-05-14T12:36:52Z")

</div>

Hello, It would appear that there’s no support for vtkOSPRayPass in the latest vtk 9.0.0 Python wheel. Is there any plan to support it? Thanks for all your hard work!

---

## [VTK 9 Release Notes](https://discourse.vtk.org/t/vtk-9-release-notes/3290)

<div class="topic-metadata">

**Author:** [@sherinnovation](https://discourse.vtk.org/u/sherinnovation)\
**Replies:** 4\
**Last updated:** [May 14, 2020, 12:14pm UTC](https://discourse.vtk.org/t/vtk-9-release-notes/3290 "2020-05-14T12:14:40Z")

</div>

Hi, I am trying to understand what has been newly introduced in VTK 9 when compared with previous verions. How can I get this information? Unfortunately, I couldn’t find anything like release notes. Please help. Thanks …

---

## [consuming much memory when the model runs](https://discourse.vtk.org/t/consuming-much-memory-when-the-model-runs/2901)

<div class="topic-metadata">

**Author:** [@xuexl](https://discourse.vtk.org/u/xuexl)\
**Replies:** 8\
**Last updated:** [May 14, 2020, 11:59am UTC](https://discourse.vtk.org/t/consuming-much-memory-when-the-model-runs/2901 "2020-05-14T11:59:46Z")

</div>

I encounter a strange question, when the model runs, the memory of my computer is consumed so much, about ten times or more of the model size. Has anyone encountered the same problem ? Waiting for your anwser, welcome…

---

## [Question about face numbering in hexahedron cells](https://discourse.vtk.org/t/question-about-face-numbering-in-hexahedron-cells/3286)

<div class="topic-metadata">

**Author:** [@lijas](https://discourse.vtk.org/u/lijas)\
**Replies:** 1\
**Last updated:** [May 14, 2020, 9:26am UTC](https://discourse.vtk.org/t/question-about-face-numbering-in-hexahedron-cells/3286 "2020-05-14T09:26:29Z")

</div>

For the cell vtkTriQuadraticHexahedron, the face numbering is defined here as The mid-surface nodes lies on the faces defined by (first edge nodes id’s, than mid-edge nodes id’s): (0,1,5,4;8,17,12,16), (1,2,6,5;9,18,13…

---

## [access vtkSmartPointer member variable](https://discourse.vtk.org/t/access-vtksmartpointer-member-variable/3269)

<div class="topic-metadata">

**Author:** [@rds15](https://discourse.vtk.org/u/rds15)\
**Replies:** 6\
**Last updated:** [May 13, 2020, 3:19am UTC](https://discourse.vtk.org/t/access-vtksmartpointer-member-variable/3269 "2020-05-13T03:19:16Z")

</div>

Hi All, I have a question regarding proper use of vtkSmartPointer as a member variable. As I understand it, to prevent the smart pointer from going out of scope, it can be set as a member variable so that it is not dele…

---

## [About vtkRenderWindowInteractor](https://discourse.vtk.org/t/about-vtkrenderwindowinteractor/3294)

<div class="topic-metadata">

**Author:** [@Seram](https://discourse.vtk.org/u/Seram)\
**Replies:** 0\
**Last updated:** [May 13, 2020, 2:56am UTC](https://discourse.vtk.org/t/about-vtkrenderwindowinteractor/3294 "2020-05-13T02:56:58Z")

</div>

Hello everyone I succeeded in viewing Ply 3D Data. But I would like to disable the actor’s rotation (= left mouse click) function among the many functions of vtkRenderWindowInteractor. I would appreciate it if you cou…

---

## [How to get the position of image in the vtkimageviewer2](https://discourse.vtk.org/t/how-to-get-the-position-of-image-in-the-vtkimageviewer2/3291)

<div class="topic-metadata">

**Author:** [@Amnesie](https://discourse.vtk.org/u/Amnesie)\
**Replies:** 0\
**Last updated:** [May 13, 2020, 12:56am UTC](https://discourse.vtk.org/t/how-to-get-the-position-of-image-in-the-vtkimageviewer2/3291 "2020-05-13T00:56:31Z")

</div>

Hello everyone, I have a new problem with vtk when i try to get the position of image in the vtkimageviewer2 if i clicked left button. I set a dicomseries as Input to vtkimageviewer2 ,it works fine Here is my Code,I o…

---

## [How to use vtkTemporalStatistics?](https://discourse.vtk.org/t/how-to-use-vtktemporalstatistics/3289)

<div class="topic-metadata">

**Author:** [@myousefi2016](https://discourse.vtk.org/u/myousefi2016)\
**Replies:** 0\
**Last updated:** [May 12, 2020, 8:40pm UTC](https://discourse.vtk.org/t/how-to-use-vtktemporalstatistics/3289 "2020-05-12T20:40:54Z")

</div>

I’m trying to use vtkTemporalStatistics in python. Basically I have several vtkUnstructuredGrid objects and I want to feed them into vtkTemporalStatistics to take time-average over them. I’m not sure how to feed each tim…

---

## [Differences in paraview and vtk volume rendering?](https://discourse.vtk.org/t/differences-in-paraview-and-vtk-volume-rendering/3288)

<div class="topic-metadata">

**Author:** [@kevins](https://discourse.vtk.org/u/kevins)\
**Replies:** 1\
**Last updated:** [May 12, 2020, 8:30pm UTC](https://discourse.vtk.org/t/differences-in-paraview-and-vtk-volume-rendering/3288 "2020-05-12T20:30:25Z")

</div>

I am trying to create a volume rendering in vtk that resembles the paraview output as closely as possible. Is it possible to produce the same volume rendering with paraview and vtk? Are there known settings or pipeline…

---

## [VTK9: Problem with display helper object factory](https://discourse.vtk.org/t/vtk9-problem-with-display-helper-object-factory/3287)

<div class="topic-metadata">

**Author:** [@codeling](https://discourse.vtk.org/u/codeling)\
**Replies:** 2\
**Last updated:** [May 12, 2020, 7:39pm UTC](https://discourse.vtk.org/t/vtk9-problem-with-display-helper-object-factory/3287 "2020-05-12T19:39:16Z")

</div>

Trying to build and run our application against VTK 9, I’m running into the trouble that when we create our 3D volume rendering pipeline, it crashes on line 647 of vtkFixedPointVolumeRayCastMapper.cxx (apparently there i…

---

## [How should the xml file for bezier geometries look like?](https://discourse.vtk.org/t/how-should-the-xml-file-for-bezier-geometries-look-like/3235)

<div class="topic-metadata">

**Author:** [@lijas](https://discourse.vtk.org/u/lijas)\
**Replies:** 3\
**Last updated:** [May 12, 2020, 5:41pm UTC](https://discourse.vtk.org/t/how-should-the-xml-file-for-bezier-geometries-look-like/3235 "2020-05-12T17:41:11Z")

</div>

Hello In my FE program i want to export some beizer cells so I can visualize them in paraview. I cant find any documentation on how the cells/points/weights of the bezier cells should exported. I am completely new to …

---

## [Segmentation fault with a SIGSEGV signal](https://discourse.vtk.org/t/segmentation-fault-with-a-sigsegv-signal/3277)

<div class="topic-metadata">

**Author:** [@davidlni](https://discourse.vtk.org/u/davidlni)\
**Replies:** 5\
**Last updated:** [May 12, 2020, 4:38pm UTC](https://discourse.vtk.org/t/segmentation-fault-with-a-sigsegv-signal/3277 "2020-05-12T16:38:00Z")

</div>

Hi all, I built VTK from source on my docker Ubuntu container. If I run any Python script which involves renderer, I get following segmentation fault error. In CCMake, I did turn on RenderingOpenGL2 and the corresponded…

---

## [Input arrays with vtkPythonAlgorithm](https://discourse.vtk.org/t/input-arrays-with-vtkpythonalgorithm/3282)

<div class="topic-metadata">

**Author:** [@lhofmann](https://discourse.vtk.org/u/lhofmann)\
**Replies:** 0\
**Last updated:** [May 12, 2020, 11:28am UTC](https://discourse.vtk.org/t/input-arrays-with-vtkpythonalgorithm/3282 "2020-05-12T11:28:31Z")

</div>

Python classes derived from VTKPythonAlgorithmBase have the usual SetInputArrayToProcess method but no GetInputArrayToProcess. However, GetInputArrayInformation does exist and works just like in C++. Ist this done on pu…

---

## [Plane size limitations?](https://discourse.vtk.org/t/plane-size-limitations/3280)

<div class="topic-metadata">

**Author:** [@Yongun\_Lee](https://discourse.vtk.org/u/Yongun_Lee)\
**Replies:** 0\
**Last updated:** [May 12, 2020, 10:58am UTC](https://discourse.vtk.org/t/plane-size-limitations/3280 "2020-05-12T10:58:02Z")

</div>

Hello. When we arrive at the edge of the plane, we do not want the plane to be widened. (Indicated in blue.) What should I do?

---

## [Segfault on VTK 9.0.0 when creating vtkTextActor](https://discourse.vtk.org/t/segfault-on-vtk-9-0-0-when-creating-vtktextactor/3265)

<div class="topic-metadata">

**Author:** [@olympionex](https://discourse.vtk.org/u/olympionex)\
**Replies:** 4\
**Last updated:** [May 12, 2020, 5:14am UTC](https://discourse.vtk.org/t/segfault-on-vtk-9-0-0-when-creating-vtktextactor/3265 "2020-05-12T05:14:35Z")

</div>

On line 78 of vtkTextActor.cxx, the call to vtkTexture::New() returns a nullptr seemingly because it can’t find a factory to create that type and then I get a segfault when the next line tries to deference that pointer. …

---

## [Surface reconstruction using Activiz control](https://discourse.vtk.org/t/surface-reconstruction-using-activiz-control/3279)

<div class="topic-metadata">

**Author:** [@janhavi\_deshpande](https://discourse.vtk.org/u/janhavi_deshpande)\
**Replies:** 0\
**Last updated:** [May 12, 2020, 4:55am UTC](https://discourse.vtk.org/t/surface-reconstruction-using-activiz-control/3279 "2020-05-12T04:55:27Z")

</div>

Hello, I am trying to render 3D surface using set of contours. I found that surface reconstruction is taking lesser time with activiz control than c++. Why does implementation using activiz takes less time? Also I want …

---

## [vtkCollisionDetectionFilter](https://discourse.vtk.org/t/vtkcollisiondetectionfilter/2594)

<div class="topic-metadata">

**Author:** [@Jaafar\_Nasrabadi](https://discourse.vtk.org/u/Jaafar_Nasrabadi)\
**Replies:** 6\
**Last updated:** [May 11, 2020, 3:46am UTC](https://discourse.vtk.org/t/vtkcollisiondetectionfilter/2594 "2020-05-11T03:46:26Z")

</div>

hi i compiled vtk 8.2.0 with cmake and vs 2017 and i tested it. but i can’t see vtkCollisionDetectionFilter. is any special setings needed to compile vtk and use vtkCollisionDetectionFilter? Thanks a lot.

---

## [Select points inside a box by custom interactor style](https://discourse.vtk.org/t/select-points-inside-a-box-by-custom-interactor-style/3249)

<div class="topic-metadata">

**Author:** [@sjtu-xx](https://discourse.vtk.org/u/sjtu-xx)\
**Replies:** 0\
**Last updated:** [May 8, 2020, 3:17pm UTC](https://discourse.vtk.org/t/select-points-inside-a-box-by-custom-interactor-style/3249 "2020-05-08T15:17:16Z")

</div>

I want to select points inside a box by custom interactor style. To do this, I try to decide if a point inside a defined frustum. The frustum.FunctionValue(pointdata) value of points inside frustum should smaller than ze…

---

## [Is there a class to show croocked slice from vtkImageData](https://discourse.vtk.org/t/is-there-a-class-to-show-croocked-slice-from-vtkimagedata/3261)

<div class="topic-metadata">

**Author:** [@kerim](https://discourse.vtk.org/u/kerim)\
**Replies:** 2\
**Last updated:** [May 9, 2020, 9:12pm UTC](https://discourse.vtk.org/t/is-there-a-class-to-show-croocked-slice-from-vtkimagedata/3261 "2020-05-09T21:12:19Z")

</div>

Hi, I have 3D data in file that can be displayed as vtkImageData. But I dont want to upload the whole file to the RAM because it weighs few Gigabytes. So I decided to display vertical slice from this file (see picture).…

---

## [Can't extract boundary from vtkPolyData](https://discourse.vtk.org/t/cant-extract-boundary-from-vtkpolydata/3258)

<div class="topic-metadata">

**Author:** [@kerim](https://discourse.vtk.org/u/kerim)\
**Replies:** 5\
**Last updated:** [May 9, 2020, 2:14pm UTC](https://discourse.vtk.org/t/cant-extract-boundary-from-vtkpolydata/3258 "2020-05-09T14:14:21Z")

</div>

Hi, I’m trying to retrieve boundary points from vtkPolyData but without success. Here is how I try to do that: // here are 9 points (see picture below) vtkSmartPointer\<vtkPoints\> points = vtkSmartPointe…

---

## [How can I use the vtkProbeFilter with a point cloud](https://discourse.vtk.org/t/how-can-i-use-the-vtkprobefilter-with-a-point-cloud/3243)

<div class="topic-metadata">

**Author:** [@timofeymukha](https://discourse.vtk.org/u/timofeymukha)\
**Replies:** 2\
**Last updated:** [May 8, 2020, 8:04am UTC](https://discourse.vtk.org/t/how-can-i-use-the-vtkprobefilter-with-a-point-cloud/3243 "2020-05-08T08:04:31Z")

</div>

Dear all, I’m trying to achieve what seems to be an easy task, yet I cannot manage to do it. I have a large polyData, and a large point cloud (a list of points). I want to sample the cell data values of the polyData at …

---

## [Data set via SetPixelData / SetRBACharPixelData not shown](https://discourse.vtk.org/t/data-set-via-setpixeldata-setrbacharpixeldata-not-shown/3247)

<div class="topic-metadata">

**Author:** [@codeling](https://discourse.vtk.org/u/codeling)\
**Replies:** 0\
**Last updated:** [May 7, 2020, 8:09pm UTC](https://discourse.vtk.org/t/data-set-via-setpixeldata-setrbacharpixeldata-not-shown/3247 "2020-05-07T20:09:55Z")

</div>

I’m trying to use a rubber band selection in one of my render windows. However, while the selection itself works fine, something about this render window prevents the rubber band from being drawn; the selection works as…

---

## [Partitioned Unstructured Grid Catalyst](https://discourse.vtk.org/t/partitioned-unstructured-grid-catalyst/3240)

<div class="topic-metadata">

**Author:** [@TakisCFD](https://discourse.vtk.org/u/TakisCFD)\
**Replies:** 0\
**Last updated:** [May 7, 2020, 4:23pm UTC](https://discourse.vtk.org/t/partitioned-unstructured-grid-catalyst/3240 "2020-05-07T16:23:21Z")

</div>

Dear All Following a partitioned unstructured grid across processes where the following are true: Each MPI process holds a number of elements Each MPI process holds a number of nodes no ghost nodes mesh geometry remai…

---

## [question about the last reslice of vtkResliceImageViewer](https://discourse.vtk.org/t/question-about-the-last-reslice-of-vtkresliceimageviewer/3238)

<div class="topic-metadata">

**Author:** [@yuhuimoon](https://discourse.vtk.org/u/yuhuimoon)\
**Replies:** 0\
**Last updated:** [May 7, 2020, 3:43pm UTC](https://discourse.vtk.org/t/question-about-the-last-reslice-of-vtkresliceimageviewer/3238 "2020-05-07T15:43:47Z")

</div>

I’m using vtkResliceImageViewer to show the volume image. I set the viewer to the oblique mode. There are 192 slices in the sagittal direction. When I scroll the viewer to the image by mouse wheel, I can’t get the 192th …

---

## [question about image bounds](https://discourse.vtk.org/t/question-about-image-bounds/3231)

<div class="topic-metadata">

**Author:** [@yuhuimoon](https://discourse.vtk.org/u/yuhuimoon)\
**Replies:** 2\
**Last updated:** [May 7, 2020, 3:51pm UTC](https://discourse.vtk.org/t/question-about-image-bounds/3231 "2020-05-07T15:51:53Z")

</div>

I have a volume image with the size of 192 x 256 x 256. The spacing of the image is 1. I use GetBounds(). The result is 0, 191, 0, 255, 0, 255. In my understanding, the result should be 0, 192, 0, 256, 0, 256. Is that ri…

[Previous page](https://discourse.vtk.org/c/support/6.md?page=130)

[Next page](https://discourse.vtk.org/c/support/6.md?page=132)