[vtkusers] Screenshot with VTK option offscreenrender on

[Johannes Strecha]

Hello,

It works for me using the nightly VTK build, but it should be ok in
5.8/5.10. My python script calls (roughly) the following:

[All connections set up, Offscreen Rendering activated, camera properly
positioned, there was an issue that the camera was aligned differently when
doing offscreen rendering]
window.Render()
window2image.Modified()
jpeg_writer.Write()

window is a vtkXOpenGLRenderWindow and I use a vtkOpenGLRenderer, I sit on
a Debian System with proprietary nVidia drivers (304.48) and a GT 520.
NB: I rendered a lot of images using this script, and with vtk 5.8 this
caused the X-process to hog/leak memory. This was not the case using VTK6.

I do not know my way around QT & VTK together, but maybe this helps.

Best regards,
Johannes Strecha.


On Tue, Nov 27, 2012 at 1:57 AM, Darshan Pai <darshanpai at gmail.com> wrote:

> I have a QT application and using a QVTkWidget for rendering VTK objects.
> I recently compiled VTK with offscreen rendering on.
>
> I was trying to take a screenshot of the QVTkWidget , using the
> vtkWindowToImageFilter.
> The problem is that it works on my machine, but the screenshot is empty
> when trying it in another machine.
>
> I found out that that if I use VTK without offscreen rendering it works.
>
> Is there any way to solve this problem?
>
> Regards
> Darshan
>
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