# General

• ## paraview

1. Presently, a parent in the pipeline can only be deleted when all children have been deleted before. Suggestion to allow deletion of a parent with implicit deletion of all of its children (instead of throwing an error that parent cannot be deleted).

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2. We and our colleagues (working in fly brain neuroanatomy) use the NRRD format. We have >100,000 NRRD images with data gzip encoded. gzip compression is useful because many images are sparse and compress by factors of >10 or even >100x.

At least on the current v5.4.1 on mac gzip encoding is not supported.

ERROR: In /Users/kitware/dashboards/buildbot-slave/8275bd07/build/superbuild/paraview/src/VTK/Common/ExecutionModel/vtkExecutive.cxx, line 784
vtkPVCompositeDataPipeline (0x7fbe227f98d0): Algorithm vtkPNrrdReader(0x7fbe23649220) returned failure for request: vtkInformation (0x7fbe227f99e0)
Debug: Off
Modified Time: 211881
Reference Count: 1
Registered Events: (none)
Request: REQUESTINFORMATION
ALGORITHM
AFTERFORWARD: 1
FORWARD
DIRECTION: 0

It…

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3. VRML reader should support aliased materials, OBJ reader should support MTL files (suggested by David E DeMarle)

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4. this data file crashes paraview 3.14.1 on mac osx 10.6.8.
i know it's a bad data file; there is no space separating the X and Y components of the POINT data.

i know this isn't the bug tracker.

# vtk DataFile Version 3.0

Surprise, surprise. Bad input data crashes ParaView.
ASCII
DATASET UNSTRUCTURED_GRID
POINTS 1 double
0.622120545112035E+000-0.418009927112657E+000 0.000000000000000E+000
CELLS 1 2

       1
1


CELL_TYPES 1

       1


CELLDATA 1
VECTORS test
vec double
1.000000000000000E+000 2.000000000000000E+000 3.000000000000000E+000

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5. Scale the speed at which zoom occurs based on mouse input. In other words, add a user preference for scaling how rapidly or slowly the scene zooms in or out based on moving the scroll wheel. My mouse seems extremely sensitive.

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6. Add capabilities to the VRML, WebGL, X3D etc. writers to enable the export of animated scenes.

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7. Right now quantities are associated to nodes or elements, but in electromagnetics some quantities are naturally associated to faces (fluxes) or edges (magnetomotive forces) and special finite elements (nedelec / raviart-thomas) can be used to interpolate such quantities. Is support for such entities planned? If not how difficult would it be to implement it?

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8. Wireframe (or surface with wireframe) representation does not work with quadratic elements when in multi-core mode. The cause is that quadratic wireframe is not supported when geometry is shipped from server to client (which is implicitly the case for multi-core mode). See bug 10676, the bug that originally implemented correct quadratic wireframes, for more details on this unimplemented case.

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9. Many open-source CAE software can import/export .unv files (I-DEAS universal files).

I would like to have this option in ParaView

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10. When using a data-set with multiple spatial blocks, where the temporal information is present in the top-level multi-block wrapper node,
the pathlines filter does not find any timestepping information.

(cf. related discussion on the mailing list: http://www.paraview.org/pipermail/paraview/2010-October/019042.html)

Since we produce our data massively in parallel, we can not write a single spatial block efficiently and must rely on xdmf's multi-block capability. Without an efficient trajectory-trace filter, however, particle plotting using paraview is obviously mostly pointless.

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11. Currently (as of version 4.1), when exporting line chart views in vector form, the mathtext axis labels get output in plain form such as $\gamma$ instead of the Greek gamma symbol. Mathtext apperaing elsewhere, such as legends, gets output correctly. Only the axes labels do not get output correctly. I have tested it with both "renedr text as paths" checked and unchecked and the error was not affected by it.

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12. Add better NASTRAN support for bulk file input

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13. The plane source seems very awkward to use - specifying three corners of the plane. A more natural way to specify a plane is by the origin and normal vector. A radius would also be needed to specify how large the patch of the plane should be. Maybe a "Square Sphere Source" source could be added on top of the existing Sphere Source so people can use the existing one for "difficult" planes (non-rectangular) and the new one for "easy" planes (square).

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14. It would be useful to have a reader for SEG-Y seismic data, with the option to translate between big-endian and little-endian forms (UNIX to PC). This may be a complicated task since most data will be in two-way time (unless depth converted). However , this should not be a problem given that the freeware GMT software can read the data and convert to a useable format. Something to consider.

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15. It would be great to have a filter that directly computes cells volume and store it as a variable

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16. Adding latex functionality would also be great, but impractical for some purposes. There are 3 fonts, serif, sans and mono. I am using Ubuntu 10.04 on this computer, and it gives me the options of arial, times and courier, the free ms fonts. The fonts, however, are not arial times and courier. I think they are some of the fonts from my distribution. I installed the ttf-mscorefonts package which installs arial, times etc. from the repositories, but the fonts remain the same.
I personally would like to choose my own font like Freesans or Nimbus, which both are Helvetica clones.…

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17. As suggested here,
http://www.paraview.org/pipermail/paraview/2011-May/021348.html
I propose supporting varying timestep for .vtk format files
via the vtk index.

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18. It is very frustrating to use various softwares in order to convert files from .vtk. Since Paraview includes lots of readers, why not writing the corresponding writers ?

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19. I see that it's been requested for quite a while! It'd be marvelous if you could just obtain the difference, union or intersection of two shapes with a click of a button... Just saying....

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20. Windows 10 seems to have some incompatibilities with Paraview (v. 5.1.0), and sometimes crashes when opening .xdmf files. Also, when representing volumes, they do not look as good as in Ubuntu 14.04.