[vtk-developers] QVTKRenderWindowInteractor bug in Mac OS
Andras Lasso
lasso at queensu.ca
Wed Oct 31 21:17:15 EDT 2018
Initially, when 3D Slicer switched to VTK8/Qt5/OpenGL2 backend, image reslice speed was about 5-10x slower than using the old VTK7/Qt4/OpenGL backend.
We could achieve acceptable performance by:
1. Switching to TBB SMP backend in VTK. This primarily helped on Windows computers with i7 CPU and strong NVidia GPU (https://github.com/Slicer/Slicer/pull/930).
2. Tuning strategy how ScheduleRender() calls are converted to Render() calls. This helped in particular in getting consistent frame rates on MacOSX. (https://github.com/commontk/CTK/blob/master/Libs/Visualization/VTK/Widgets/ctkVTKAbstractView.h)
Still, image reslicing is about 10-20% slower with VTK8/Qt5/OpenGL2, especially on laptops and computers with combined integrated+discrete GPU. It seems most time is spent in the OpenGL driver, mainly due to calls made from vtkOpenGLTexture::Load (https://issues.slicer.org/view.php?id=4496).
Andras
-----Original Message-----
From: vtk-developers <vtk-developers-bounces at public.kitware.com> On Behalf Of take5v
Sent: Wednesday, October 31, 2018 6:58 PM
To: vtk-developers at vtk.org
Subject: Re: [vtk-developers] QVTKRenderWindowInteractor bug in Mac OS
Hi David!
Thank you for the detailed response. I've changed Render call with QVTKRenderWindowInteractor update method but I observed no performance change. But I got lucky twice when changing window/level was real-time without any lags. I have no idea how to reproduce this behavior again but I do confirm the same inconsistency in Slicer3D on Windows machine. I found changing window/level of 2d slices is slow but 3d volume rendering is fast.
There is a thread, apparently, with similar performance issue from Slicer3D:
https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdiscourse.slicer.org%2Ft%2F2d-views-in-slicer-extremely-slow-on-windows%2F782&data=02%7C01%7Classo%40queensu.ca%7C60be52993c6448c59bbb08d63f844891%7Cd61ecb3b38b142d582c4efb2838b925c%7C1%7C0%7C636766234722688008&sdata=z%2F85pd7WeC8GI7%2FmnMlNsUcx3JRogc5sJfByit0kA0Q%3D&reserved=0.
I also tried vtkImageViewer2 without qt and got the same laggy behavior.
Nvidia driver: 411.31
David Gobbi wrote
> Hi Stas,
>
> Here are a couple things to try to improve fps (no guarantees, though).
>
> With QVTKRenderWindowInteractor, it is best to let Qt handle the
> render calls, rather than calling Render() directly. So try replacing
> all of your calls to Render() with calls to self.update(), where
> 'self' is the QVTKRenderWindowInteractor. If you do not do this, then
> it is possible that the Render() is hidden because it isn't associated
> with a Qt paint operation. By calling update() on a Qt widget, you
> ensure that Qt will call Render() synchronously with its paintEvent().
>
> A second thing to try is to call Update() on your reader before using
> its output. Most readers will 'stream' which means that they only
> read the slices that are requested by the VTK pipeline (possibly
> causing the reader to re-execute on future pipeline requests), unless
> you specifically call Update() which forces all the slices to be read
> into memory at once. Since your example only has one input slice, I
> doubt that this is what is causing a slow-down for you, but it is
> still a good habit when working with VTK readers.
>
> - David
>
>
> On Wed, Oct 31, 2018 at 10:57 AM take5v <
> stas.truhan@
> > wrote:
>
>> Another issue but within the same context of mine toy example (script
>> of which I posted above) is a slow fps during window/level change on
>> Windows.
>> This process is slow and laggy even during rendering the super small
>> image of vtk.png from VTKData.
>>
>> CPU: GeForce GTX 680
>> GPU: Intel i7-3770K
>>
>>
>>
>> -----
>> Best regards,
>> Stanislau Trukhan
>> --
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-----
Best regards,
Stanislau Trukhan
--
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