[Paraview] Scaling cylinder glyph's radius and height individually

Fri Feb 2 15:35:49 EST 2018

Ahmad,

First, I recommend that you try loading your plugin in the ParaView
UI, using the ParaView that you built your plugin against. Then, in
Tools -> Manage Plugins. Click on Load New... and select the file
libvtkPVGlyphFilterP.so. You should now be able to find your filter
GlyphP in the Filters menu.

Second, to instantiate the filter the way you are trying is correct,
but first you need to load the plugin. I believe you can do it this
way:

vtkSMPluginManager::LoadLocalPlugin("<path>/<to>/libvtkPVGlyphFilterP.so");

HTH,
Cory

On Thu, Feb 1, 2018 at 1:12 PM, Ahmad . <super_achie at hotmail.com> wrote:
> Sorry about that Cory; will keep this in the mailing list.
>
>
> I have tried to implement your suggestion, and now I have generated a plugin
> file "libvtkPVGlyphFilterP.so".
>
> Please find the files I used to create this plugin in the attachment.
>
>
> What I did after compiling the plugin:
>
>
> Try to use the new class I made, like such:
> `session_manager_->NewProxy("filters", "GlyphP")));`
> where GlyphP is what I called my custom glyph filter (see the xml file in
> the attachment).
> Compile my application against "libvtkPVGlyphFilterP.so".
> Run my application and get the following error:
>
>
> ERROR: In
> /home/ahmad/paraview/ParaViewCore/ServerImplementation/Core/vtkSIProxyDefinitionManager.cxx,
> line 526
> vtkSIProxyDefinitionManager (0x294d320): No proxy that matches:
> group=filters and proxy=GlyphP were found.
>
> I feel like I am missing an important step, which has to do with the XML
> file, but I don't know how.
>
> In the Plugin Wiki of ParaView the instructions I find after compiling are:
> Then using cmake and a build system, one can build a plugin for this new
> filter. Once this plugin is loaded the filter will appear under the
> "Alphabetical" list in the Filters menu.
> There are no instructions on how to use the new class in a C++ pipeline...
>
> Any pointers on this?
>
> Best,
> Ahmad
>
> ________________________________
> Van: Cory Quammen <cory.quammen at kitware.com>
> Verzonden: vrijdag 19 januari 2018 16:59
> Aan: Ahmad .; ParaView
>
> Onderwerp: Re: [Paraview] Scaling cylinder glyph's radius and height
> individually
>
> Ahmad,
>
> Please keep replies on the mailing list. Responses are inlined.
>
> On Tue, Jan 16, 2018 at 9:25 AM, Ahmad . <super_achie at hotmail.com> wrote:
>
> Hi Cory,
>
>
> Thanks for your reply.
>
>
> I am trying to implement your suggestion of extending the vtkGlyph3D with
> this additional "scaling by normals".
>
> The idea seems quite straightforward. I was just wondering how to
> incorporate this new class in my C++ pipeline.
>
> Currently I create the glyph, and set its properties, like this:
>
>
> vtkSmartPointer<vtkSMSourceProxy> glyph;
>         glyph.TakeReference(vtkSMSourceProxy::SafeDownCast(
>             session_manager_->NewProxy("filters", "Glyph")));
>         controller_->PreInitializeProxy(glyph);
>
>         vtkSMPropertyHelper(glyph, "Input").Set(producer);
>         vtkSMPropertyHelper(glyph, "Source").Set(GetCylinderSource(glyph));
>         vtkSMPropertyHelper(glyph, "ScaleMode", true).Set(0);
>         vtkSMPropertyHelper(glyph, "ScaleFactor", true).Set(1.0);
>         vtkSMPropertyHelper(glyph, "GlyphMode", true).Set(0);
>
> As you can see I am not directly working with vtkGlyph3D or vtkPVGlyphFilter
> classes, but I am using the vtkSMPropertyHelper to take care of the
> boilerplate code.
>
>
> Right. Unfortunately, implementing my suggestion would require creating a
> subclass of vtkPVGlyphFilter and importing that with a ParaView plugin. See
> the ParaView Howto on how to add a filter to ParaView.
>
> After I created a new class that has this extra scaling option, how would I
> go about using this in such a pipeline? Do I need to 'register' my
> "ModifiedGlyph" to the filter proxies to be able to do something like
> `NewProxy("filters", "ModifiedGlyph")`?
>
>
> Yes, that should do it. Your modified glyph class will be available once
> you've imported the ParaView plugin mentioned above.
>
> A quick question about setting the active normals. Is there an existing way
> to do this, or would I need to do this myself? I would like to do this the
> same way one would set the "Scalars":
>
>
> vtkSMPropertyHelper(glyph, "Normals")
>             .SetInputArrayToProcess(vtkDataObject::POINT, "ScalingArray");
>
>
> I think that should work.
>
> Best,
> Cory
>
>
> Looking forward to your reply.
>
> Best,
> Ahmad
>
>
>
> ________________________________
> Van: Cory Quammen <cory.quammen at kitware.com>
> Verzonden: dinsdag 9 januari 2018 15:30
> Aan: Ahmad .
> CC: paraview at paraview.org
> Onderwerp: Re: [Paraview] Scaling cylinder glyph's radius and height
> individually
>
> Hi Ahmad,
>
> Alas, reading the code of vtkGlyph3D, you cannot orient by a vector
> array different from the vector array used to do the scaling using the
> functionality in ParaView. You would have to modify either
> vtkPVGlyphFilter or its parent class vtkGlyph3D, to do this, and
> expose the new VTK class through a ParaView plugin [1]. A simple
> modification would be to add a ScaleMode, say VTK_SCALE_BY_NORMAL, to
> vtkGlyph3D, and then set the active normals in your data set to the
> vector by which you wish to scale. Then the "vectors" property could
> control the orientation and the active normals would control the
> scale. That's kind of kludgey, but it would be a fairly fast
> modification to make.
>
> HTH,
> Cory
>
> [1] https://www.paraview.org/Wiki/ParaView/Plugin_HowTo
> ParaView/Plugin HowTo - KitwarePublic
> www.paraview.org
> Introduction. ParaView comes with plethora of functionality bundled in:
> several readers, multitude of filters, quite a few different types of views
> etc.
>
>
>
>
> On Tue, Jan 9, 2018 at 7:43 AM, Ahmad . <super_achie at hotmail.com> wrote:
>> Just want to add that a programmatic (C++) solution is preferred rather
>> than
>> using the GUI
>>
>>
>> I have a C++ pipeline where I can set the properties of the cylinder glyph
>> with vtkSMPropertyHelper.
>>
>> I have looked in filters.xml under vtkPVGlyphFilter source proxy (file
>> located in
>> <paraview_home>/ParaViewCore/ServerManager/SMApplication/Resources) to see
>> what my options are, but there is only one "SetInputArrayToProcess" that
>> takes a vector attribute as input; nothing about a vector specifically for
>> orientation..
>>
>> Suggestions on how to handle this issue, are very welcome; other
>> approaches
>> than mine as well!
>>
>> ________________________________
>> Van: Ahmad . <super_achie at hotmail.com>
>> Verzonden: maandag 8 januari 2018 20:52
>> Aan: paraview at paraview.org
>> Onderwerp: Re: Scaling cylinder glyph's radius and height individually
>>
>>
>> Following up on my own question, I found out that if I scale by "Vector
>> Components" it is possible to change the length of the cylinders with the
>> second vector index, and the radius with the first and third. I need to
>> rearrange my attribute data as such: [radius_x, length, radius_z]. If I
>> keep
>> radius_x == radius_z, then the cylinder will not deform, and the cross
>> section stays a perfect circle. See the image in the attachment please.
>>
>>
>> BUT the problem here is that "vector components" also affects the
>> orientation of my cylindrical glyphs. I can turn this off in the
>> properties
>> menu, but I need to orient my cylinders based on another vector attribute
>> data...
>>
>>
>> I feel I'm getting somewhere, but if someone could give me an idea on how
>> to
>> now orient my glyphs with another vector data than the one I use now for
>> scaling, that would be much appreciated!
>>
>>
>> Best,
>> Ahmad
>>
>> ________________________________
>> Van: Ahmad . <super_achie at hotmail.com>
>> Verzonden: maandag 8 januari 2018 18:01
>> Aan: paraview at paraview.org
>> Onderwerp: Scaling cylinder glyph's radius and height individually
>>
>>
>> Dear community,
>>
>>
>> When I try to scale cylindrical glyph objects by a 'Scalar', it scales
>> both
>> the radius and height of the glyphs.
>>
>> Is there a way to scale the radius by a Scalar1, and the height be a
>> Scalar2?
>>
>>
>> I have an unstructured grid, and for each point I want to create a
>> cylinder
>> that can have an arbitrary radius and height.
>>
>> I thought Glyphs would be the way to go, but I'm kind of stuck with this
>> issue.
>>
>>
>> Any help is much appreciated; or if you can recommend a different way to
>> achieve the above-mentioned please let me know!
>>
>>
>> Best,
>>
>> Ahmad
>>
>>
>> _______________________________________________
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>>
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>>
>> Please keep messages on-topic and check the ParaView Wiki at:
>> http://paraview.org/Wiki/ParaView
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>
> --
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.
>
>
>
>
> --
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.

-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.