[vtkusers] VTK-JS: How to visualize numbers

Cristina Oyarzun coyarzunlaura at googlemail.com
Fri Dec 1 10:01:07 EST 2017

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!!

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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