[vtk-developers] Rendering hangs in viewport

[Will Schroeder]

Taras-

My initial reaction is that there is a memory leak. If I understand you
correctly, you are running 12-15 hours and then problems start occurring.
Even a small leak can add up over that length of time and corrupt memory. I
would first instrument your classes and see if they are leaking; if not it
could be a VTK problem although we try and test for this kind of behavior.

Best,
W

On Tue, Jul 5, 2016 at 7:00 AM, Taras Shchehelskyi <shchegelskij at gmail.com>
wrote:

>
>
>
>
> Hello,
>
>
>
> I am part of the team that is working on project that uses VTK 7.0 for
> rendering mesh grid (not big, about 400k triangles) couple point clouds
> (about 8000 – 30000 points per cloud, up to 4 clouds) + couple very simple
> meshes. Our app can work fine for 12-15h for then main viewport hangs. When
> I do some mouse interaction (click + move or scroll) some meshes became
> invisible for couple seconds and that became visible again. Also when I
> resize viewport window scene aspect ratio became wrong. It works like
> aspect ratio does not depends of viewport size.
>
>
>
> Also we noticed other strange thing. Our point clouds update dynamically
> during app work. We create 2 classes:
>
> class CameraPointCloudSource : public vtkPolyDataAlgorithm
>
> and
>
> class PointCloudColoring : public vtkPolyDataAlgorithm.
>
>
>
> I pass data (vtkPolyData with initialized points and vertexes) from
> CameraPointCloudSource to PointCloudColoring. I setup pipeline that output
> of the CameraPointCloudSource is input of the PointCloudColoring.
>
>
>
> Sometimes (can’t always reproduce this) *CameraPointCloudSource::
> RequestData* stops to be called and *CameraPointCloudSource::RequestData*
> always get the same input data (the same point cloud the same with the same
> points). As result I always see in viewport the same point cloud
> visualization. I checked, code that responsible for point cloud generation
> works fine and produce correct point clouds.
>
>
>
> For test we also tried to use new VTK PointCloud filters. There we also
> noticed similar behavior. We set filters chain.  Alter some long time (>
> 12h of work) sometimes some filters star producing the same output that not
> depends of input point cloud. Interesting that some filters work fine and
> some start producing the same output. This issue can be in combination with
> viewport rendering hangs. Sometimes can happen before hang. Sometimes can
> happen after rendering hang.
>
>
>
> Our app uses many threads for generating data. We have many mutexes to
> protect data. But we are pretty sure that there are no deadlocks. Also we
> checked couple times that we not share Actors and Mappers between threads.
> We have couple viewports. But I was able to reproduce bug even when only
> one viewport is active. Interesting that when one viewport can hang, other
> viewports that uses the same data can work fine.
>
>
>
> We are using Windows 7/10 x64 and MS VS 2013.
>
>
>
>
>
> Any ideas what can lead to this problem?
>
>
>
> P.S. Sorry for my English, I am not a native speaker.
>
>
>
>
>
> Thanks,
>
> Taras
>
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-- 
William J. Schroeder, PhD
Kitware, Inc. - Building the World's Technical Computing Software
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(518) 881-4902
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