[vtkusers] VTK-JS: How to get Position of actor

Tue Oct 24 11:24:29 EDT 2017

Then fix the json file that describe your dataset and make sure the points
are defined with a numberOfComponent of 3 like here:
https://github.com/Kitware/vtk-js/blob/master/Data/cow.vtp/index.json#L27

On Tue, Oct 24, 2017 at 2:34 AM, Katrin Hartwig <katrin_hartwig at gmx.de>
wrote:

> I checked the version, it is the same.
>
> *Gesendet:* Montag, 23. Oktober 2017 um 20:32 Uhr
>
> *Von:* "Sebastien Jourdain" <sebastien.jourdain at kitware.com>
> *An:* "Katrin Hartwig" <katrin_hartwig at gmx.de>
> *Cc:* vtkusers <vtkusers at vtk.org>
> *Betreff:* Re: [vtkusers] VTK-JS: How to get Position of actor
> Hum, looking at the code it seems that information should be properly set.
>
> https://github.com/Kitware/vtk-js/blob/master/Utilities/
> DataGenerator/vtk-data-converter.py#L182
>
> Are you using an older version?
>
> On Mon, Oct 23, 2017 at 2:29 PM, Sebastien Jourdain <
> sebastien.jourdain at kitware.com> wrote:
>>
>> Ok the issue is related to the vtkDataConverter that does not properly
>> define the number of component to 3 for points.
>> You can edit the generated json to fix that. This will fix the
>> getBounds() call.
>>
>> I'm going to fix the vtkDataConverter code.
>>
>> On Mon, Oct 23, 2017 at 6:50 AM, Katrin Hartwig <katrin_hartwig at gmx.de>
>> wrote:
>>>
>>> Hi Sebastien,
>>> I stored the data as vtk data and used the vtkDataConverter which seemed
>>> to work fine. When I run the code, every actor appears exactly at the right
>>> place. So I guess the information in the vtk data must be correct (without
>>> ever using any function like "setPosition"). Though I do not understand why
>>> I cannot retrieve the information of their positions in the code.
>>>
>>> Here is how I read my data files, it is a function I found in the
>>> documentation:
>>>
>>> function loadSegment(string, actor, renderer, i){
>>>     const reader = vtkHttpDataSetReader.newInstance({ fetchGzip: true
>>> });
>>> reader.setUrl(string).then(() => {
>>>   reader.loadData().then(() => {
>>>     renderer.resetCamera();
>>>     renderWindow.render();
>>>   });
>>> });
>>> const mapper = vtkMapper.newInstance();
>>> mapper.setInputConnection(reader.getOutputPort());
>>> actor.setMapper(mapper);
>>> renderer.addActor(actor);
>>> }
>>>
>>> Any ideas what could be wrong?
>>>
>>> Thank you for your help!
>>>
>>> Am 20.10.2017 um 21:39 schrieb Sebastien Jourdain:
>>>
>>> Then I believe your dataset is not valid. How did you build it?
>>>
>>>
>>> On Fri, Oct 20, 2017 at 1:07 PM, Katrin Hartwig <katrin_hartwig at gmx.de>
>>> wrote:
>>>>
>>>> Hi Sebastian and Logan,
>>>>
>>>> thank you a lot for your help and i apologize for my late answer!
>>>> Unfortunately I still could not solve the problem. I tried both
>>>> suggestions:
>>>> With *actor*.getCenter() I get the default-values (0,0,0) for each
>>>> actor. So I tried to get the information of the dataset as you suggested:
>>>>
>>>>        dataset = mapper.getInputData();
>>>>        bounds = dataset.getBounds();
>>>>
>>>> By doing so I get the following error massage:
>>>> *       "getBounds called on an array with components of 1"*
>>>>
>>>> The output of getBounds remains default because of the error.
>>>>
>>>> As I could not find any solutions yet, I would be grateful for any help!
>>>>
>>>> Thank you
>>>> Katrin
>>>>
>>>> *Gesendet:* Montag, 18. September 2017 um 16:38 Uhr
>>>> *Von:* "Sebastien Jourdain" <sebastien.jourdain at kitware.com>
>>>> *An:* "Katrin Hartwig" <katrin_hartwig at gmx.de>
>>>> *Cc:* vtkusers <vtkusers at vtk.org>
>>>> *Betreff:* Re: [vtkusers] VTK-JS: How to get Position of actor
>>>> Hi Katrin,
>>>>
>>>> The actor position only describe the relative position to the data,
>>>> that's why by default they are always (0,0,0).
>>>> Which means its your source or dataset that has the information about
>>>> the position that you are looking for.
>>>>
>>>> For example to find the bounds of a rendered dataset you can do as
>>>> follow.
>>>>
>>>> dataset = mapper.getInputData();
>>>> bounds = dataset.getBounds();
>>>>
>>>> // bounds is an array as follow:
>>>> // [ minX, maxX, minY, maxY, minZ, maxZ]
>>>>
>>>> Hope that helps,
>>>>
>>>> Otherwise you can learn more on the basic concepts behind VTK here:
>>>> https://www.vtk.org/vtk-users-guide/
>>>>
>>>> Seb
>>>>
>>>> On Mon, Sep 18, 2017 at 7:31 AM, Katrin Hartwig <katrin_hartwig at gmx.de>
>>>> wrote:
>>>>>
>>>>> Dear all,
>>>>>
>>>>> I am using a visualization of several actors with VTK-js.
>>>>> Unfortunately, when using *actor.getPosition() *I always get [0,0,0]
>>>>> as a result, no matter which actor I checked, although they appear on
>>>>> different positions in my rendering window.
>>>>> How can I get the real positions or centers of the different actors?
>>>>>
>>>>> As I am completely new to VTK-js and I could not find any solutions to
>>>>> my problem, any help would be great!
>>>>>
>>>>> Thank you
>>>>> Katrin
>>>>>
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