[vtkusers] Control VTK frame rate

[Bill Lorensen]

How many actors do you have?

On Jul 4, 2017 4:26 PM, "kay" <jayavardhanravi at outlook.com> wrote:

> My Input data is generated by the realtime system, so the high frequency of
> data. But the VTK application I am trying to build is not a real time
> system. To explain further, the pseudo code that I posted before works by
> calling render in a loop.
>
> double realTimevariable; // This variable is updated by the real time
> system
> every millisecond
> while(true)
> {
>    t->Identity();
>    t->RotateZ(realTimevariable); // realTimevariable takes the value at
> this
> point of time
>    t->update();
>    renderer->addActor(act);
>    renderer->modified();
>    renderWindow->render();
> }
>
> Each time the loop is run value of the realTimeVariable is taken from the
> memory at that instance of time.
> This process works for less number of actors and frame rate is 12-14, but
> if
> the actors are doubled the frame rate goes down by 7-9 which is visible to
> the eye. From what I understand, this looping of render call
> (renderWindow->Render();) is what you mentioned "swamping VTK with render
> requests", Please correct me if I am wrong.
>
> And I dont want to control data to 60 times per second, as I want VTK to
> render as often as it can (Minimum of 12 FPS)
>
> I am not using QT, just basic vtk pipeline in C++.
>
>
>
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