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

[Sebastien Jourdain]

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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>>
>
>
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