[vtkusers] Render images in threads other than main thread

[Elvis Stansvik]

2018-04-03 9:48 GMT+02:00 Mathieu Westphal <mathieu.westphal at kitware.com>:
> Hi Hugh
>
> QVTKOpenGLWidget is currently undergoing a complete redesign, the new
> version should be avaible shortly.
> In any case you can test it beforehand by compiling  a specific developement
> branch of VTK, that can be found here:
> https://gitlab.kitware.com/vtk/vtk/merge_requests/3745

I have to jump in and ask: This new class doesn't make it safe to call
Render() from threads other than the UI thread, right? Or does it
change things wrt to threading vs the old QOpenGLWidget?

Just asking so there are no misunderstandings.

Elvis

>
> Best,
>
>
> Mathieu Westphal
>
> On Mon, Apr 2, 2018 at 12:31 PM, Todd via vtkusers <vtkusers at vtk.org> wrote:
>>
>> Hi Hugh
>>
>> GUI elements are normally only updated on the main thread, so I suspect
>> you need to synchronize your callback from the worker thread. I'm not
>> familiar with Qt, but it seems to be documented.
>> http://www.informit.com/articles/article.aspx?p=1405551&seqNum=3
>>
>> Todd
>>
>>
>> On 2 Apr 2018 10:00 p.m., lor fal <lorfalwit at gmail.com> wrote:
>>
>> Hi all:
>>
>> I am using QVTKOpenGLWidget to bridge between Qt and Vtk. However, when I
>> trying to call vtkRenderWindowInteractor::Render in worker thread, it always
>> report error like "makeCurrent() error", which seems something wrong while
>> changing OpenGL context. I have googled my questions and found some
>> suggestions but none of them could work.
>>
>> Does anybody know exactly how to render images in worker thread?
>>
>> Thanks in advance.
>>
>> --
>> Best regards,
>> Hugh Lo
>>
>>
>>
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