[vtkusers] animation while renderer responsive

[Elvis Stansvik]

2018-05-09 16:09 GMT+02:00 Sam Raby <rabysam28 at gmail.com>:
> Hello, I have a vtkPolyData that I can display fine. Every half a second
> another vrkplydata comes in, so I need to display the new vtkpolydata
> instead of the old one, and so forth. It is essentially like an animation
> but the incoming vtkploydata are different in size and content, so I cannot
> use the same vtkpolydata object every time.
>
> Is there an example so I see how to approach this? One requirement is that
> as this animation is displayed I need to be able to still interact with the
> scene such as zoom in and out. So it needs to be an unblocking call.

I think that everything up to the AddActor(..) and Render() calls on
the renderer can be made in a different thread. But the AddActor(..)
and Render() calls must be made from the main (GUI) thread (please
someone correct me if I'm wrong).

So your GUI will be blocked for some time, depending on how much time
those two calls take for your polydata.

In our application we also have this problem, but we're working with
volumes (not polydata). The GUI should ideally be fully responsive
while a volume is being added to the renderer, but it will freeze for
some hundred ms or so. I don't think there's a way around this. We do
the reading/creation of the volume pipeline in a separate thread, but
still the adding of the volume to the renderer and the subsequent
first render will take some time.

Elvis

>
> Thanks
> -s
>
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