# Support

**URL:** https://discourse.vtk.org/c/support/6.md?page=159

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

**Page:** 160

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## [Lighting update on camera position reset](https://discourse.vtk.org/t/lighting-update-on-camera-position-reset/629)

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**Author:** [@Marco](https://discourse.vtk.org/u/Marco)\
**Replies:** 6\
**Last updated:** [April 11, 2019, 7:04pm UTC](https://discourse.vtk.org/t/lighting-update-on-camera-position-reset/629 "2019-04-11T19:04:13Z")

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Hi all. In my Java-based, VTK-based application, I am working on the implementation of volume rendering functionalities. I am working with the latest VTK 8.2. All is working pretty well at the moment: I can generate an…

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## [vtkGlyph3DMapper::ScaleMode: mismatch between header and source files](https://discourse.vtk.org/t/vtkglyph3dmapper-mismatch-between-header-and-source-files/741)

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**Author:** [@Haocheng\_Liu](https://discourse.vtk.org/u/Haocheng_Liu)\
**Replies:** 2\
**Last updated:** [April 11, 2019, 7:00pm UTC](https://discourse.vtk.org/t/vtkglyph3dmapper-mismatch-between-header-and-source-files/741 "2019-04-11T19:00:59Z")

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vtkGlyph3DMapper header states that the default ScaleMode is NO\_DATA\_SCALING. However in the source file, it’s set to SCALE\_BY\_MAGNITUDE. Question: What should be the right default settings here? ParaView seems is abl…

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## [Calculate Volume of Quadratic Tetrahedron](https://discourse.vtk.org/t/calculate-volume-of-quadratic-tetrahedron/728)

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**Author:** [@alx](https://discourse.vtk.org/u/alx)\
**Replies:** 4\
**Last updated:** [April 11, 2019, 4:09pm UTC](https://discourse.vtk.org/t/calculate-volume-of-quadratic-tetrahedron/728 "2019-04-11T16:09:50Z")

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I have an unstructured mesh of quadratic tetrahedrons. I would like to calculate the volume of each cell, but I am only able to calculate the volume of a linear tetrahedron using vtk.vtkMeshQuality.TetVolume(cell). Is t…

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## [Subpixel edge detection with local surface fitting to maximum gradient](https://discourse.vtk.org/t/subpixel-edge-detection-with-local-surface-fitting-to-maximum-gradient/718)

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**Author:** [@madcting](https://discourse.vtk.org/u/madcting)\
**Replies:** 8\
**Last updated:** [April 11, 2019, 3:51pm UTC](https://discourse.vtk.org/t/subpixel-edge-detection-with-local-surface-fitting-to-maximum-gradient/718 "2019-04-11T15:51:53Z")

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Dear all, I’m new to vtk. I’m wondering if there’s already a solutions for extracting surfaces from CT dataset, with subpixel precision. Tools such as Slicer, FIJI and OpenIA uses marching cubes or flying edges for cr…

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## [Different positions between vtkPolyDataMapper2D and vtkPolyDataMapper](https://discourse.vtk.org/t/different-positions-between-vtkpolydatamapper2d-and-vtkpolydatamapper/732)

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**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\
**Replies:** 0\
**Last updated:** [April 10, 2019, 4:05pm UTC](https://discourse.vtk.org/t/different-positions-between-vtkpolydatamapper2d-and-vtkpolydatamapper/732 "2019-04-10T16:05:19Z")

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Hi I have a spline and i want to transform it in polydata. If i do it in 3d it works perfect but then i use the viewer, it only renders it in the slice corresponding to its z. And i want to have it in every slice. To do…

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## [VTK 8.2 10 bit color monitor support](https://discourse.vtk.org/t/vtk-8-2-10-bit-color-monitor-support/731)

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**Author:** [@davidu](https://discourse.vtk.org/u/davidu)\
**Replies:** 0\
**Last updated:** [April 10, 2019, 3:07pm UTC](https://discourse.vtk.org/t/vtk-8-2-10-bit-color-monitor-support/731 "2019-04-10T15:07:27Z")

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Dear community. I have searched all over to look if support for 10 bit displays is built in. I saw it was in a wish list some distributions before…

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## [Rendering/OSPRay to be renamed Rendering/RayTracing in VTK 9.0](https://discourse.vtk.org/t/rendering-ospray-to-be-renamed-rendering-raytracing-in-vtk-9-0/720)

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**Author:** [@Dave\_DeMarle](https://discourse.vtk.org/u/Dave_DeMarle)\
**Replies:** 1\
**Last updated:** [April 10, 2019, 9:18am UTC](https://discourse.vtk.org/t/rendering-ospray-to-be-renamed-rendering-raytracing-in-vtk-9-0/720 "2019-04-10T09:18:50Z")

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Hey folks, Just a heads up that starting with VTK master as of Yesterday, the OptiX rendering module has been removed and the OSPRay module has been renamed RayTracing, which is now capable of using both back ends. The …

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## [Intersect polydata with an implicit function](https://discourse.vtk.org/t/intersect-polydata-with-an-implicit-function/706)

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**Author:** [@lmainguy](https://discourse.vtk.org/u/lmainguy)\
**Replies:** 9\
**Last updated:** [April 9, 2019, 9:24pm UTC](https://discourse.vtk.org/t/intersect-polydata-with-an-implicit-function/706 "2019-04-09T21:24:42Z")

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Hi all, There is vtkIntersectionPolyDataFilter to get the intersection of two polydata but I didn’t find a filter that could that with a polydata and an implicit function. Of course, one can convert an implicit functio…

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## [Get PointID with PointPicker in Polydata](https://discourse.vtk.org/t/get-pointid-with-pointpicker-in-polydata/713)

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**Author:** [@Thomas](https://discourse.vtk.org/u/Thomas)\
**Replies:** 1\
**Last updated:** [April 9, 2019, 7:01pm UTC](https://discourse.vtk.org/t/get-pointid-with-pointpicker-in-polydata/713 "2019-04-09T19:01:06Z")

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Hi everybody, I currently have some problems concerning the pointPicker in vtk. I have a dataset in polydata, which I visualize as points in a qvtk-widget as part of a qt-framework. Here, I define: // point Picker (pi…

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## [Python VTK -- Can we get the mesh rendered from the colorized point cloud](https://discourse.vtk.org/t/python-vtk-can-we-get-the-mesh-rendered-from-the-colorized-point-cloud/200)

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**Author:** [@ljc19800331](https://discourse.vtk.org/u/ljc19800331)\
**Replies:** 17\
**Last updated:** [April 9, 2019, 7:37am UTC](https://discourse.vtk.org/t/python-vtk-can-we-get-the-mesh-rendered-from-the-colorized-point-cloud/200 "2019-04-09T07:37:25Z")

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Hello, I am going to capture different images from different viewpoint pose of virtual camera in Python VTK. When I set a close viewpoint to the point cloud, the point cloud became sparse and I could not get a good imag…

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## [Git LFS error checking out VTKExamples](https://discourse.vtk.org/t/git-lfs-error-checking-out-vtkexamples/650)

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**Author:** [@Aron\_Helser](https://discourse.vtk.org/u/Aron_Helser)\
**Replies:** 3\
**Last updated:** [April 8, 2019, 12:55pm UTC](https://discourse.vtk.org/t/git-lfs-error-checking-out-vtkexamples/650 "2019-04-08T12:55:12Z")

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I’m having a problem checking out the VTKExamples repo right now. It gives me a git LFS error, on a fresh clone or a pull: Downloading src/Testing/Data/Frog/frog.mhd (304 B) Error downloading object: src/Testing/Data/F…

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## [Is there a "slice(s) of pie" filter in VTK?](https://discourse.vtk.org/t/is-there-a-slice-s-of-pie-filter-in-vtk/695)

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**Author:** [@dlrdave](https://discourse.vtk.org/u/dlrdave)\
**Replies:** 3\
**Last updated:** [April 7, 2019, 10:36pm UTC](https://discourse.vtk.org/t/is-there-a-slice-s-of-pie-filter-in-vtk/695 "2019-04-07T22:36:31Z")

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I have a cylinder that bounds a polygonal data set: all of the points and cells in the data set are inside the cylinder. I would like to extract regions of the cylinder that are shaped like pieces of pie. I’d use the the…

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## [Vtkprobefilter or vtkreslicer](https://discourse.vtk.org/t/vtkprobefilter-or-vtkreslicer/689)

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**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\
**Replies:** 0\
**Last updated:** [April 4, 2019, 8:42pm UTC](https://discourse.vtk.org/t/vtkprobefilter-or-vtkreslicer/689 "2019-04-04T20:42:44Z")

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Dear all I want to reslice a 3d volume according to a curve. I compute the perpendicular every 2 points of the curve and i get this slice in the center position on the point of the curve. I am using vtkreslice filter a…

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## [vtkimagereslice does not work when i define z](https://discourse.vtk.org/t/vtkimagereslice-does-not-work-when-i-define-z/699)

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**Author:** [@zandarina](https://discourse.vtk.org/u/zandarina)\
**Replies:** 0\
**Last updated:** [April 7, 2019, 2:43pm UTC](https://discourse.vtk.org/t/vtkimagereslice-does-not-work-when-i-define-z/699 "2019-04-07T14:43:31Z")

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I want to get slices from a volume along a curve with points with vtkimagereslice and get a slice centered in each point and the orientation according to the orientation of these 2 points. The problem is when i define th…

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## [MPR (multiplanar reconstruction)](https://discourse.vtk.org/t/mpr-multiplanar-reconstruction/690)

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**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")

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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!

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## [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)

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**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")

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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…

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## [Should 8.90 be 9.0 when released?](https://discourse.vtk.org/t/should-8-90-be-9-0-when-released/666)

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**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")

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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.…

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## [vtkAVIWriter Issues](https://discourse.vtk.org/t/vtkaviwriter-issues/680)

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**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")

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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…

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## [Imageorientation problem-medical images](https://discourse.vtk.org/t/imageorientation-problem-medical-images/306)

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**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")

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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 …

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## [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)

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**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")

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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 …

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## [vtk paintbrush (segmentation)](https://discourse.vtk.org/t/vtk-paintbrush-segmentation/298)

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**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")

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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…

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## [DeepCopy of DataSet does not copy cells.](https://discourse.vtk.org/t/deepcopy-of-dataset-does-not-copy-cells/648)

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**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")

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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…

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## [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)

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**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")

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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…

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## [Customary Pipeline updating the view in an arbitrary orientation](https://discourse.vtk.org/t/customary-pipeline-updating-the-view-in-an-arbitrary-orientation/655)

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**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")

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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 …

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## [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)

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**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")

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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…

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## [Getting coordinates of interpolated points in a vtkPolyData instance](https://discourse.vtk.org/t/getting-coordinates-of-interpolated-points-in-a-vtkpolydata-instance/641)

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**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")

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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 …

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## [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)

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**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")

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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 …

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## [Filter for Averaging images?](https://discourse.vtk.org/t/filter-for-averaging-images/638)

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**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")

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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…

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## [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)

<div class="topic-metadata">

**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")

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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…

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## [Retrieving Voxel data using vtkImageReslice](https://discourse.vtk.org/t/retrieving-voxel-data-using-vtkimagereslice/625)

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**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")

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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.

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