[vtkusers] VTK-JS: How to visualize numbers

[Cristina Oyarzun]

Hello Sebastian,

first of all sorry for asking so many questions and thank you for your
help. I am trying to create 4 Render windows as you suggested. If I
understood it correctly I can change the distribution of the render windows
in the DOM element using "div" elements and changing their style. Is this
correct? Apparently I can only set a container to vtkOpenGLRenderWindow and
not to vtkRenderWindow. On the other side when I change the container for
the openglRenderWindow I seem to have two times all my actors and
renderers... Do I really need both vtkOpenGLRenderWindow and
vtkRenderWindow?

How can I ensure that the 4 RenderWindows will always cover the full screen
as it was the case by using one vtkFullScreenRenderWindow and 4 renderer?

Thank you!!
Cristina


On Mon, Dec 4, 2017 at 4:34 PM, Sebastien Jourdain <
sebastien.jourdain at kitware.com> wrote:

> I've created an issue here: https://github.com/Kitware/vtk-js/issues/445
>
> On Mon, Dec 4, 2017 at 8:31 AM, Sebastien Jourdain <
> sebastien.jourdain at kitware.com> wrote:
>
>> Hi Cristina,
>>
>> The current implementation is probably not aware of renderers that are
>> not taking the full size of the renderWindow.
>> I guess for now, you can create 4 renderWindows inside your DOM element
>> to recreate the split you were looking for with your renderers.
>>
>> Hope that make sense,
>>
>> Seb
>>
>> PS: In the meantime, we will try to add support for multi-renderer inside
>> the vtkPixelSpaceCallbackMapper
>>
>> On Mon, Dec 4, 2017 at 5:10 AM, Cristina Oyarzun <
>> coyarzunlaura at googlemail.com> wrote:
>>
>>> Hello Sebastian,
>>>
>>> thank you very much for your help. I was now able to visualize the
>>> labels. Their relative location is correct, but they do not appear in the
>>> correct renderer. They actually appear in a white "renderer" (the canvas I
>>> guess?), below my render window.
>>>
>>> How can I show the labels in a concrete renderer? As I mentioned I have
>>> four of them, and I need to show different labels in each one of them.
>>>
>>> Thank you!!
>>> Cristina
>>>
>>> On Fri, Dec 1, 2017 at 4:20 PM, Sebastien Jourdain <
>>> sebastien.jourdain at kitware.com> wrote:
>>>
>>>> Hi Cristina,
>>>>
>>>> You should fill the points in a static manner using the typed array
>>>> like below:
>>>>
>>>> var nbPoints = 10;
>>>> var coords = new Float32Array(nbPoints * 3);
>>>>
>>>> coords[0] = x0;
>>>> coords[1] = y0;
>>>> coords[2] = z0;
>>>> [...]
>>>> coords[3*n+0] = xn;
>>>> coords[3*n+1] = yn;
>>>> coords[3*n+2] = zn;
>>>>
>>>> var polydata = vtkPolyData.newInstance();
>>>> polydata.getPoints().setData(coords, 3);
>>>>
>>>> Otherwise your approach with vtkPixelSpaceCallbackMapper seems correct.
>>>>
>>>> Seb
>>>>
>>>> On Fri, Dec 1, 2017 at 8:01 AM, Cristina Oyarzun <
>>>> coyarzunlaura at googlemail.com> wrote:
>>>>
>>>>> Hello Sebastian,
>>>>>
>>>>> I am trying to adapt the example to my current problem. I have a
>>>>> render window with 4 renderers. Each renderer has several actors and some
>>>>> of them should get labels next to them.
>>>>>
>>>>> My plan now is to create a vtkPointSet, and set this as inputData to
>>>>> the vtkPixelSpaceCallbackMapper. Is this correct?
>>>>>
>>>>> My problem right now is that when I try to set a point in a vtkPoints
>>>>> the vtkPoints remains empty. Do you have any idea what the problem could
>>>>> be? Just to test I simplified the problem to this:
>>>>>
>>>>> var Points = vtkPoints.newInstance();
>>>>> Points.setPoint(0, 13, 10, 50);
>>>>> console.log("Points", Points.getNumberOfPoints());
>>>>>
>>>>> And I get always 0.
>>>>>
>>>>> Thank you!!
>>>>> Cristina
>>>>>
>>>>>
>>>>> On Wed, Nov 29, 2017 at 6:59 PM, Sebastien Jourdain <
>>>>> sebastien.jourdain at kitware.com> wrote:
>>>>>
>>>>>> The example you mention is the right approach for what you are
>>>>>> looking for.
>>>>>>
>>>>>> The reason why you don't need vtkFollowers+vtkTextActors, is that we
>>>>>> have a 2D layer on top of the 3D for which it is trivial to render text
>>>>>> that is always facing the camera. ;-)
>>>>>> And we have a mechanism that can convert a set of location in the 3D
>>>>>> world into the screen space so those label could be printed.
>>>>>>
>>>>>> Let us know if you the example is not enough to get you started.
>>>>>>
>>>>>> Seb
>>>>>>
>>>>>> On Wed, Nov 29, 2017 at 10:51 AM, Cristina Oyarzun via vtkusers <
>>>>>> vtkusers at vtk.org> wrote:
>>>>>>
>>>>>>> Hello,
>>>>>>>
>>>>>>> I would like to visualize some numbers next to my actors. I saw an
>>>>>>> example (Spheres and Labels) where a canvas is created for this purpose. I
>>>>>>> remember doing this using vtkFollowers in the past. Is there currently some
>>>>>>> easy way to do this with vtk-js? I mean something similar to vtkFollowers
>>>>>>> or vtkTextActors?
>>>>>>>
>>>>>>> Thank you!
>>>>>>> Cristina
>>>>>>>
>>>>>>>
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>>>>>>
>>>>>
>>>>
>>>
>>
>
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