# Latest **URL:** https://discourse.vtk.org/latest.md?page=253 [Latest](https://discourse.vtk.org/latest.md) · [Categories](https://discourse.vtk.org/categories.md) · [Tags](https://discourse.vtk.org/tags.md) **Page:** 254 --- ## [MPR (multiplanar reconstruction)](https://discourse.vtk.org/t/mpr-multiplanar-reconstruction/690)

**Author:** [@Marco\_Festugato](https://discourse.vtk.org/u/Marco_Festugato)\ **Replies:** 0\ **Last updated:** [April 5, 2019, 11:03am UTC](https://discourse.vtk.org/t/mpr-multiplanar-reconstruction/690 "2019-04-05T11:03:37Z")

Hi guys! I want to perform MPR on my 3D volume…how could I do that? Which classes should i use? Is there any example (i dont find any…). Thanks in advance! --- ## [What's the easiest way to determine if a VTK filter class is readily available in ParaView?](https://discourse.vtk.org/t/whats-the-easiest-way-to-determine-if-a-vtk-filter-class-is-readily-available-in-paraview/688)

**Author:** [@dlrdave](https://discourse.vtk.org/u/dlrdave)\ **Replies:** 2\ **Last updated:** [April 4, 2019, 6:47pm UTC](https://discourse.vtk.org/t/whats-the-easiest-way-to-determine-if-a-vtk-filter-class-is-readily-available-in-paraview/688 "2019-04-04T18:47:13Z")

I want to try out the vtkConnectedPointsFilter on some data I have without writing any code. I don’t see it in the massive list of filters available in the menu structure seen in ParaView’s “Filters \> Alphabetical \> …” s… --- ## [Should 8.90 be 9.0 when released?](https://discourse.vtk.org/t/should-8-90-be-9-0-when-released/666)

**Author:** [@lorensen](https://discourse.vtk.org/u/lorensen)\ **Replies:** 3\ **Last updated:** [April 4, 2019, 9:46am UTC](https://discourse.vtk.org/t/should-8-90-be-9-0-when-released/666 "2019-04-04T09:46:54Z")

Folks, Recently a user @tirons suggested that major API changes should occur as a major release. The current version in HEAD is 8.90. I assume that is just a holder for the next release. Should the next release be 9.0.… --- ## [vtkAbstractPicker::SetPropCollection](https://discourse.vtk.org/t/vtkabstractpicker-setpropcollection/683)

**Author:** [@andreasbuykx](https://discourse.vtk.org/u/andreasbuykx)\ **Replies:** 0\ **Last updated:** [April 4, 2019, 8:00am UTC](https://discourse.vtk.org/t/vtkabstractpicker-setpropcollection/683 "2019-04-04T08:00:06Z")

There is no method to assign a new prop collection to a picker, but all methods are in place to modify the prop collection, and the prop collection itself is accessible for modification. This however requires iterating o… --- ## [vtkAVIWriter Issues](https://discourse.vtk.org/t/vtkaviwriter-issues/680)

**Author:** [@Andrew](https://discourse.vtk.org/u/Andrew)\ **Replies:** 1\ **Last updated:** [April 4, 2019, 3:19am UTC](https://discourse.vtk.org/t/vtkaviwriter-issues/680 "2019-04-04T03:19:37Z")

I can’t seem to get vtkAVIWriter working. I’m making a video of a deforming polygon along with a scalar bar actor. It outputs a black screen and the polygon doesn’t show? Very strange. I know the camera is positioned co… --- ## [Merge topic 'revert-shader-properties'](https://discourse.vtk.org/t/merge-topic-revert-shader-properties/659)

**Author:** [@amaclean](https://discourse.vtk.org/u/amaclean)\ **Replies:** 3\ **Last updated:** [April 3, 2019, 1:25pm UTC](https://discourse.vtk.org/t/merge-topic-revert-shader-properties/659 "2019-04-03T13:25:45Z")

Please consider using deprecation in future. I just had to revert a whole lot of changes to the VTKExamples. Thanks Andrew --- ## [Applying clustering algorithms to a volume surface](https://discourse.vtk.org/t/applying-clustering-algorithms-to-a-volume-surface/672)

**Author:** [@LVittorelli](https://discourse.vtk.org/u/LVittorelli)\ **Replies:** 0\ **Last updated:** [April 3, 2019, 9:34am UTC](https://discourse.vtk.org/t/applying-clustering-algorithms-to-a-volume-surface/672 "2019-04-03T09:34:01Z")

Hello, I’m trying to compare some OpenFOAM CFD simulations that reproduce the flow through an almost spherical object(the object is a reconstruction, with an irregular shape), searching for the one with the smallest clu… --- ## [Imageorientation problem-medical images](https://discourse.vtk.org/t/imageorientation-problem-medical-images/306)

**Author:** [@swetha](https://discourse.vtk.org/u/swetha)\ **Replies:** 3\ **Last updated:** [April 2, 2019, 4:33pm UTC](https://discourse.vtk.org/t/imageorientation-problem-medical-images/306 "2019-04-02T16:33:55Z")

Hi, I want to display the volume read in axial,sagital and coronal views. I tried using the vtkInteractorstyleImage setorientation method. It displays the volume in the axial orientation but empty viewport in the other … --- ## [Getting bounds of selection](https://discourse.vtk.org/t/getting-bounds-of-selection/661)

**Author:** [@marf](https://discourse.vtk.org/u/marf)\ **Replies:** 1\ **Last updated:** [April 2, 2019, 1:56pm UTC](https://discourse.vtk.org/t/getting-bounds-of-selection/661 "2019-04-02T13:56:09Z")

I use the HardwareSelector and get some vtkSelectionNodes back. Now these nodes know their pixelcount on the screen, but nothing about their position. Is there any way besides going throught the mapper to accuratly get t… --- ## [After building vtk8.2.0 and building vtkmaster, there are different errors after make install](https://discourse.vtk.org/t/after-building-vtk8-2-0-and-building-vtkmaster-there-are-different-errors-after-make-install/525)

**Author:** [@QIANKE](https://discourse.vtk.org/u/QIANKE)\ **Replies:** 5\ **Last updated:** [April 2, 2019, 12:46pm UTC](https://discourse.vtk.org/t/after-building-vtk8-2-0-and-building-vtkmaster-there-are-different-errors-after-make-install/525 "2019-04-02T12:46:09Z")

Configuration: Mac mini 2018 (macOS Mojava) Processor ：3.6GHz intel Core i3 Memory ：8GB 2667 MHz DDR4 Graphics card：intel UHD Graphics 630 1536 MB This is the error that caused the startup app to build VTK8.2.0, but … --- ## [vtk paintbrush (segmentation)](https://discourse.vtk.org/t/vtk-paintbrush-segmentation/298)

**Author:** [@mikewho](https://discourse.vtk.org/u/mikewho)\ **Replies:** 5\ **Last updated:** [April 1, 2019, 9:05pm UTC](https://discourse.vtk.org/t/vtk-paintbrush-segmentation/298 "2019-04-01T21:05:27Z")

At one point there was a vtkedge library that had some paintbrush functionality. Supposedly that has been absorbed by vtk, but I can’t seem to find any paintbrush options in vtk. Is there a recommended way to go about ch… --- ## [DeepCopy of DataSet does not copy cells.](https://discourse.vtk.org/t/deepcopy-of-dataset-does-not-copy-cells/648)

**Author:** [@vadimcn](https://discourse.vtk.org/u/vadimcn)\ **Replies:** 2\ **Last updated:** [April 1, 2019, 6:18pm UTC](https://discourse.vtk.org/t/deepcopy-of-dataset-does-not-copy-cells/648 "2019-04-01T18:18:20Z")

Hi, I’m writing a ParaView filter in Python, and I need the output dataset to have the same topology and attributes as the input; only the point coordinates should to be modified. So I’m starting with this: input = vt… --- ## [append is not working well. it is copying the same slice all the time](https://discourse.vtk.org/t/append-is-not-working-well-it-is-copying-the-same-slice-all-the-time/612)

**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\ **Replies:** 2\ **Last updated:** [April 1, 2019, 11:04am UTC](https://discourse.vtk.org/t/append-is-not-working-well-it-is-copying-the-same-slice-all-the-time/612 "2019-04-01T11:04:22Z")

hello i think the append is not doing it well, i want to append the slices in a image to visualize the slices and i think it only copies one slice in all the stack. How can i see the slices one by one to know if it is d… --- ## [Customary Pipeline updating the view in an arbitrary orientation](https://discourse.vtk.org/t/customary-pipeline-updating-the-view-in-an-arbitrary-orientation/655)

**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\ **Replies:** 0\ **Last updated:** [April 1, 2019, 11:03am UTC](https://discourse.vtk.org/t/customary-pipeline-updating-the-view-in-an-arbitrary-orientation/655 "2019-04-01T11:03:50Z")

Dear all, I have created a reslice getting the slices according to the perpendicular of a curve. But i need to call this function everytime that the spline of the curve is moved by the user. Is there any way to create … --- ## [draw lines on DICOM image with vtkImageViewer2](https://discourse.vtk.org/t/draw-lines-on-dicom-image-with-vtkimageviewer2/652)

**Author:** [@719mikelee5](https://discourse.vtk.org/u/719mikelee5)\ **Replies:** 0\ **Last updated:** [April 1, 2019, 3:53am UTC](https://discourse.vtk.org/t/draw-lines-on-dicom-image-with-vtkimageviewer2/652 "2019-04-01T03:53:35Z")

Hello, friends I’m trying to draw lines on DICOM CT image. vtkImageViewer2 is my prefer to display the DICOM image. And I need to draw lines on the displayed image too, but it seems could not work. I found that vtkIma… --- ## [Struggling with geographic coordinates](https://discourse.vtk.org/t/struggling-with-geographic-coordinates/596)

**Author:** [@cobo](https://discourse.vtk.org/u/cobo)\ **Replies:** 17\ **Last updated:** [March 31, 2019, 1:09pm UTC](https://discourse.vtk.org/t/struggling-with-geographic-coordinates/596 "2019-03-31T13:09:59Z")

In my models I am working with geographic coordinates, which are meters in a range between -10’000 and +10’000, and some applications require a precision down to cm or mm - which is not covered any more with “float” data… --- ## [Would you like some advice on how to clear the model display?](https://discourse.vtk.org/t/would-you-like-some-advice-on-how-to-clear-the-model-display/646)

**Author:** [@Yuki\_Fuchigami](https://discourse.vtk.org/u/Yuki_Fuchigami)\ **Replies:** 0\ **Last updated:** [March 30, 2019, 5:01am UTC](https://discourse.vtk.org/t/would-you-like-some-advice-on-how-to-clear-the-model-display/646 "2019-03-30T05:01:04Z")

Hi, I’m viewing STL using C # RenderWindowControl. I want to erase the display of the model after loading and watching the model, but I do not know how. Would you like some advice on how to clear the model display from… --- ## [Getting coordinates of interpolated points in a vtkPolyData instance](https://discourse.vtk.org/t/getting-coordinates-of-interpolated-points-in-a-vtkpolydata-instance/641)

**Author:** [@msmerps](https://discourse.vtk.org/u/msmerps)\ **Replies:** 2\ **Last updated:** [March 30, 2019, 1:37am UTC](https://discourse.vtk.org/t/getting-coordinates-of-interpolated-points-in-a-vtkpolydata-instance/641 "2019-03-30T01:37:11Z")

Hi VTK-Experts, I’m using vtkParametricSpline to fit a spline to a set of points. I then render the spline via a vtkPolyDataMapper. I would like to access the coordinates of the interpolated points. Can I get that from … --- ## [vtkJavaMemoryManager issue](https://discourse.vtk.org/t/vtkjavamemorymanager-issue/628)

**Author:** [@mat127](https://discourse.vtk.org/u/mat127)\ **Replies:** 7\ **Last updated:** [March 30, 2019, 12:30am UTC](https://discourse.vtk.org/t/vtkjavamemorymanager-issue/628 "2019-03-30T00:30:32Z")

Hello, maybe I am missing something but it seems to me that there is an issue in the vtkJavaMemoryManagerImpl class. Let me describe the scenario: I am overriding in my Java code the vtkPolygonalHandleRepresentation3D … --- ## [how to extract geometry entirely or partly covered by selection polygon](https://discourse.vtk.org/t/how-to-extract-geometry-entirely-or-partly-covered-by-selection-polygon/639)

**Author:** [@andreasbuykx](https://discourse.vtk.org/u/andreasbuykx)\ **Replies:** 1\ **Last updated:** [March 29, 2019, 1:10pm UTC](https://discourse.vtk.org/t/how-to-extract-geometry-entirely-or-partly-covered-by-selection-polygon/639 "2019-03-29T13:10:07Z")

I’m looking for a way to select 1D, 2D and 3D (polydata and unstructured grid) geometry (shape) that is either entirely or partly covered by a 2D selection polygon (loop) drawn on the screen. All of the following cases … --- ## [Filter for Averaging images?](https://discourse.vtk.org/t/filter-for-averaging-images/638)

**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\ **Replies:** 0\ **Last updated:** [March 29, 2019, 10:10am UTC](https://discourse.vtk.org/t/filter-for-averaging-images/638 "2019-03-29T10:10:10Z")

Dear all, I have several slices (images) and i would like to make an average of all of them. As an output, i would like to get an average image where each voxel contains the average in this position. Is there any filte… --- ## [To create an spline with the same size is not exact](https://discourse.vtk.org/t/to-create-an-spline-with-the-same-size-is-not-exact/633)

**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\ **Replies:** 0\ **Last updated:** [March 28, 2019, 5:05pm UTC](https://discourse.vtk.org/t/to-create-an-spline-with-the-same-size-is-not-exact/633 "2019-03-28T17:05:02Z")

Dear all, I want to create an spline with the same size. I have used some ideas of the forum. But the value is not exact. It does not change much. But i want to know why there is difference. I use splinefilter as you me… --- ## [Retrieving Voxel data using vtkImageReslice](https://discourse.vtk.org/t/retrieving-voxel-data-using-vtkimagereslice/625)

**Author:** [@thw](https://discourse.vtk.org/u/thw)\ **Replies:** 0\ **Last updated:** [March 28, 2019, 8:06am UTC](https://discourse.vtk.org/t/retrieving-voxel-data-using-vtkimagereslice/625 "2019-03-28T08:06:38Z")

I am a newbie and try to use tkImageReslice class to retrieve voxel data in DICOM files. Really appreciate an insight, which can explain me a way to retrieve those data. I use C++ as my programming language. --- ## [vtkSmartPointer and vtkNew in VTK's API. Best practices?](https://discourse.vtk.org/t/vtksmartpointer-and-vtknew-in-vtks-api-best-practices/518)

**Author:** [@allison.vacanti](https://discourse.vtk.org/u/allison.vacanti)\ **Replies:** 19\ **Last updated:** [March 27, 2019, 2:11pm UTC](https://discourse.vtk.org/t/vtksmartpointer-and-vtknew-in-vtks-api-best-practices/518 "2019-03-27T14:11:26Z")

As best practices emerge in a post-C++11 world, one of the newer guidelines becoming commonplace is “don’t use raw pointers.” Preferring smart pointers prevents a host of mistakes and provides an additional level of safe… --- ## [Modifying scalar bar value labels](https://discourse.vtk.org/t/modifying-scalar-bar-value-labels/468)

**Author:** [@dbonhaus](https://discourse.vtk.org/u/dbonhaus)\ **Replies:** 1\ **Last updated:** [March 27, 2019, 1:28pm UTC](https://discourse.vtk.org/t/modifying-scalar-bar-value-labels/468 "2019-03-27T13:28:21Z")

I need to apply a unit conversion to the numeric labels displayed with the scalar bar. I tried subclassing the scalar bar actor and overriding the EditAnnotations method, but there are no annotations to edit when the met… --- ## [Update time step of a filter having multiple inputs on one of its ports](https://discourse.vtk.org/t/update-time-step-of-a-filter-having-multiple-inputs-on-one-of-its-ports/615)

**Author:** [@embeddedmz](https://discourse.vtk.org/u/embeddedmz)\ **Replies:** 0\ **Last updated:** [March 27, 2019, 11:58am UTC](https://discourse.vtk.org/t/update-time-step-of-a-filter-having-multiple-inputs-on-one-of-its-ports/615 "2019-03-27T11:58:59Z")

Hello, Is there someone who can tell me why UPDATE\_TIME\_STEP of a port connection of a filter is not an epoch anymore when this last has a repeatable input (info-\>Set(vtkAlgorithm::INPUT\_IS\_REPEATABLE(), 1); ) but rath… --- ## [vtkScalarBarActor New macro problem](https://discourse.vtk.org/t/vtkscalarbaractor-new-macro-problem/610)

**Author:** [@ramon.j.moral](https://discourse.vtk.org/u/ramon.j.moral)\ **Replies:** 2\ **Last updated:** [March 26, 2019, 10:07pm UTC](https://discourse.vtk.org/t/vtkscalarbaractor-new-macro-problem/610 "2019-03-26T22:07:02Z")

Hello, I am using QtCreator to make a vtk App. I wanted to make a section of the app that shows the vtkScalarBarActor so the USER can get a feeling for the colors their going to use for their state plot. I have two li… --- ## [vtkResliceImageViewer do not recognize the slice in z build from append from reslice](https://discourse.vtk.org/t/vtkresliceimageviewer-do-not-recognize-the-slice-in-z-build-from-append-from-reslice/608)

**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\ **Replies:** 1\ **Last updated:** [March 26, 2019, 4:56pm UTC](https://discourse.vtk.org/t/vtkresliceimageviewer-do-not-recognize-the-slice-in-z-build-from-append-from-reslice/608 "2019-03-26T16:56:19Z")

Dear all, I have a question. I want to show using vtkResliceImageViewer the slices i have got from the reslicer filter. So i append in z the output and i call a fuction to show me the vtkImageData withh all the… --- ## [vtkResliceImageViewer only shows one slice from a vtkImageData obtained from reslice filter](https://discourse.vtk.org/t/vtkresliceimageviewer-only-shows-one-slice-from-a-vtkimagedata-obtained-from-reslice-filter/607)

**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\ **Replies:** 0\ **Last updated:** [March 26, 2019, 3:57pm UTC](https://discourse.vtk.org/t/vtkresliceimageviewer-only-shows-one-slice-from-a-vtkimagedata-obtained-from-reslice-filter/607 "2019-03-26T15:57:38Z")

**Author:** [@mwestphal](https://discourse.vtk.org/u/mwestphal)\ **Replies:** 2\ **Last updated:** [March 26, 2019, 3:21pm UTC](https://discourse.vtk.org/t/mun-out/605 "2019-03-26T15:21:47Z")

Looks like our only windows dashboard has been out for some time. When can we expect it back ? [Previous page](https://discourse.vtk.org/latest.md?page=252) [Next page](https://discourse.vtk.org/latest.md?page=254)