[vtkusers] Control VTK frame rate

[Elvis Stansvik]

Den 4 juli 2017 3:54 em skrev "kay" <jayavardhanravi at outlook.com>:
>
> I had rendered actors to the render window. As I increase the number of
> actors the frame rate decreases and the rendering is slow. Is there any
> possible way to set the frame rate or increase the rendering speed as the
> number of actors increase.
>
> I tried to use ImmediateRenderingMode but I could not find any difference
in
> rendering speed/ Frame Rate.
>
> I am trying to move the actor based on the input which is generated every
> millisecond i.e 1000 datapoints for 1 second and apply it to the actors to
> make a rotation.

Why do you need such a high frame rate? I don't think a human can really
perceive any differences at such high rates. 60 FPS or so is normally the
target to strive for (with monitors).

Elvis

>
> Sample code that I use:
>
> vtkSource s = new vtksource;
> vtktransform t = new vtktransform;
> vtktransformpolydatafilter tf = new vtktransformpolydatafilter;
> tf->setinputconnection(s->getoutputport());
> tf->settransform(t);
> vtkpolydatamapper map = new vtkpolydatamapper;
> map->setinputconnection(tf->getoutputport());
> vtkactor act = new vtkactor;
> act->setmapper(map);
> while(true)
> {
>    t->Identity();
>    t->RotateZ(SomeInputData); // SomeInputData changes every millisecond
and
> transform is in a loop
>    t->update();
>    renderer->addActor(act);
>    renderer->modified();
>    renderWindow->render();
> }
>
> As the number of actors rendered to the same window increases the frame
rate
> decreases.
> I used renderer->GetLastRenderTimeInSeconds(); to get the frame rate (i.e
> 1/time)
>
> Any solutions or suggestions would be helpful.
>  Thanks for taking time to read the post.
>
> Regards,
> Kay
>
>
>
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