[vtkusers] Automatically change radius of sphere when a variable changes its value

Ken Martin ken.martin at kitware.com
Fri Aug 4 10:28:16 EDT 2017

1) actor->SetScale(...) instead of changing the sphere source


2) use a Glyph3DMapper with a scale array to control the scale of each


3) vtkOpenGLSphereMapper with a scale array

Which solution works best depends on the specifics of your use case, ala is
only one sphere changing radius?, are they all?, are they all changing by
the same amount? one actor? 100 actors? etc.

On Fri, Aug 4, 2017 at 10:00 AM, M. Jordan <mjordan at live.at> wrote:

> Hello,
> I have a scene with many spheres (about 100) in my QVTK-Widget.
> Now I would like to achieve that the radii of the spheres change
> automatically when a variable changes its value.
> Right now I add the spheres to the scene, start a timer and in the timer
> callback I change the radius of the SphereSources depending on the
> variable. Finally, I call qvtkwidget->update(); to update the spheres in
> my scene.
> It works, but i would like to improve the speed. Any ideas how to update
> spheres faster? Is there any possibility to only "re-render" one sphere and
> not the whole scene?
> Thank you!
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Ken Martin PhD
Distinguished Engineer
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065

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