[vtkusers] Updating color of actor without call renderWindow->Render()

[Andras Lasso]

You may use ctkVTKAbstractView (or copy-paste its rendering mechanism into your code). It has a scheduleRender() method that you call instead of directly calling Render(). The class makes sure that actual rendering does not happen more frequently than the DesiredUpdateRate set in the render window.

http://www.commontk.org/docs/html/classctkVTKAbstractView.html
https://github.com/commontk/CTK/blob/master/Libs/Visualization/VTK/Widgets/ctkVTKAbstractView.h

Or, you may enable “vsync” in your GPU driver, which delays your rendering thread if it gets rendering request more frequently than the refresh rate of your monitor.

Andras

From: vtkusers <vtkusers-bounces at vtk.org> On Behalf Of Ken Martin
Sent: Thursday, May 3, 2018 8:40 AM
To: Voigteri <eric.voigt at outlook.de>
Cc: vtk <vtkusers at vtk.org>
Subject: Re: [vtkusers] Updating color of actor without call renderWindow->Render()

If the events/actions that cause a color change can happen significantly faster than your render rate then you should break apart the two actions (changing the color and rendering). Have a queue of color changes that you push to and then on the next render pop all the ones that have accumulated. The rendering can be driven by a timer. That way you can have 500 Hz of color changes and a 30Hz render rate for example.



On Thu, May 3, 2018 at 3:53 AM, Voigteri <eric.voigt at outlook.de<mailto:eric.voigt at outlook.de>> wrote:
Hi all,

I have a long list of actors and I periodically (very short time intervals)
update the color of these actors with

actors[i]->GetProperty()->SetColor(r,g,b);
renderWindow->Render()

after each color change. However, this redraws the entire scene, not just
the actor I am updating and causes my application to become quite sluggish
since the colors can be changed interactively by the user at a fast pace.

Is there a better/more efficient way to do this?

Kind regards,

Eric



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Ken Martin PhD
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Kitware Inc.
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Carrboro, North Carolina
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