[vtkusers] Combined on-screen and off-screen possible with VTK-7.0.0 on linux/X?
Ken Martin
ken.martin at kitware.com
Fri Oct 28 09:49:22 EDT 2016
I believe you can use
renderWindow->OffScreenRenderingOn();
renderWindow->Render();
renderWindow->OffScreenRenderingOff();
renderWindow->Render();
to swap between on/offscreen. There is a new test
TestToggleOSWithInteractor that checks for this. As a warning that test
works on OpenGL2 with Windows and Linux (not EGL) only I think. Other
combinations may have issues. Revamping the window creation/offscreen code
is on my list for the next release.
On Fri, Oct 28, 2016 at 9:45 AM, Elvis Stansvik <
elvis.stansvik at orexplore.com> wrote:
> 2016-10-28 15:31 GMT+02:00 Sophonet <vtk12af6bc42 at kant.sophonet.de>:
> > Have you tried VTK 7.1.0.rc1? It includes the patch for combining on- and
> > off-screen rendering (you need to set VTK_OPENGL_HAS_OSMESA=True). I have
> > not tried it myself for OpenGL2, but if I recall correctly, the changes
> > should not have been limited to OpenGL, but according to
> > https://gitlab.kitware.com/vtk/vtk/blob/master/CMake/vtkOpenGL.cmake,
> line
> > 48, VTK_USE_OFFSCREEN_EGL (Offscreen) may not be combined with VTK_USE_X
> > (Onscreen).
>
> Aha, thanks. I am using 7.1.0.rc1, but I'm not using that option. I'll
> try turning it on.
>
> Do you happen to know if there's an example of off-screen rendering
> with VTK 7.x somewhere? The one at
>
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Utilities/OffScreenRendering
>
> is for <= 5.10.
>
> Elvis
>
> >
> >
> >
> > Am 2016-10-28 15:18, schrieb Elvis Stansvik:
> >>
> >> Sorry for sort of necro-posting to this old thread, but I'm also
> >> interested in if on- and off-screen rendering is possible with the
> >> same build of VTK 7.x (using OpenGL2 backend in my case)? Or will I
> >> need separate builds of VTK for this purpose? (and if so, if there are
> >> plans to fix that).
> >>
> >> Thanks in advance,
> >> Elvis
> >>
> >> 2016-02-08 10:52 GMT+01:00 Michael Bachmann
> >> <Michael.Bachmann at synopsys.com>:
> >>>
> >>> Hello list!
> >>> Hello Sophonet!
> >>>
> >>> First of all:
> >>> => Thank you Sophonet for investigating this issue and for describing
> the
> >>> patch to "VTKROOT/CMake/vtkOpenGL.cmake".
> >>> I applied your patch and it also re-enables offscreen rendering
> on a
> >>> headless machine (were no X DISPLAY is available).
> >>>
> >>> Actually I really wonder why there are only a few posts about this
> issue.
> >>> For the application I'm working on the ability of VTK7 to perform
> >>> On-Screen and Off-Screen rendering with a single build of VTK is an
> absolute
> >>> must-have! (Just like it was in VTK5 and VTK6)
> >>>
> >>> Please take the suggestion of Sophonet into account and re-enable it at
> >>> least for the OpenGL rendering backend.
> >>> Making this available for the OpenGL2 backend should also be
> considered.
> >>>
> >>> Building the software twice, e.g. like it is done for paraview
> >>> (non-headless) and the paraview server (headless) is not an option for
> >>> everyone.
> >>> Actually is quite a big burden which has been silently put on the
> >>> shoulders of VTK users.
> >>>
> >>> So please: Provide the facilities to perform On-Screen and Off-Screen
> >>> rendering with a single build of VTK using OSMesa and X on Linux again!
> >>>
> >>> Best regards,
> >>> Michael
> >>>
> >>>
> >>>
> >>> Date: Thu, 21 Jan 2016 14:54:46 +0100
> >>> From: Sophonet <vtk12af6bc42 at kant.sophonet.de>
> >>> To: vtkusers at vtk.org
> >>> Subject: Re: [vtkusers] Combined on-screen and off-screen possible
> >>> with VTK-7.0.0 on linux/X?
> >>> Message-ID: <ac1f14a73f567e2e8e5916a5c942dc04 at srv19.sysproserver.de>
> >>> Content-Type: text/plain; charset=UTF-8; format=flowed
> >>>
> >>> As one further follow-up of my two earlier e-mails, I have partly
> >>> answered the question myself... remember, my question is related to the
> >>> OpenGL (not OpenGL2) rendering backend.
> >>>
> >>> Two observations:
> >>>
> >>> 1. It seems that the current CMake flag VTK_OPENGL_HAS_OSMESA is
> useless,
> >>> since it does not set anything relevant (see my e-mail below) 2. It
> seems
> >>> that combined on-screen / off-screen rendering is possible (on Mesa
> 9.2.3
> >>> using the OpenGL rendering backend):
> >>>
> >>> As a quick hack, I have changed VTKROOT/CMake/vtkOpenGL.cmake such
> >>> that
> >>>
> >>> * VTK_USE_OSMESA = True (triggers find_package OSMesa)
> >>> * VTK_USE_X = True (triggers find_package OpenGL)
> >>>
> >>> ...and (at the bottom) vtk_module_link_libraries links to *both*,
> >>> ${OSMESA_LIBRARY} and ${OPENGL_LIBRARIES}.
> >>>
> >>> After this hack, I can successfully launch interactive
> >>> (glx-)renderwindows as well as set (occasionally) set
> >>> SetOffscreenRenderingOn().
> >>>
> >>> Therefore, my suggestion would be to
> >>>
> >>> - remove VTK_OPENGL_HAS_OSMESA
> >>> - change the vtkOpenGL.cmake such that VTK_USE_OSMESA is exposed as an
> >>> advanced option and is not exclusive w.r.t. VTK_USE_X, but may be set
> at the
> >>> same time.
> >>>
> >>> Any comments?
> >>>
> >>> Thanks,
> >>>
> >>> Sophonet
> >>>
> >>>
> >>> Am 2016-01-19 11:06, schrieb Sophonet:
> >>>>
> >>>> As a follow-up, I have done some more investigations myself and am
> >>>> still lost:
> >>>>
> >>>> According to http://www.vtk.org/Wiki/VTK/OSMesa_Support, it seems
> that
> >>>> the legacy OSMesa library on linux systems is not needed anymore, but
> >>>> that software renderers (such as gallium llvm) can provide off-screen
> >>>> rendering themselves. Correct?
> >>>>
> >>>> When looking at VTKROOT/CMake/vtkOpenGL.cmake, it appears (not
> >>>> perfectly sure though) that in this case VTK_OPENGL_HAS_OSMESA needs
> >>>> to be turned on, since this flag sets VTK_CAN_DO_OFFSCREEN to 1.
> >>>> However, it seems to me that VTK_CAN_DO_OFFSCREEN is not used anywhere
> >>>> else (did a thorough "grep" on that keyword in the source tree).
> >>>>
> >>>> It seems that Marcus (Hanwell) was responsible for many of these
> >>>> changes in CMake - Marcus, can you help?
> >>>>
> >>>> What I would like to do is (see my first e-mail below) to
> >>>> simultaneously use interactive rendering and (occasionally) off-screen
> >>>> rendering (for generating static images), which was possible on Linux
> >>>> in earlier versions of VTK (e.g. 5.10), but is not possible anymore.
> >>>>
> >>>> Thanks,
> >>>>
> >>>> Sophonet
> >>>>
> >>>>
> >>>> Am 2016-01-15 12:44, schrieb Sophonet:
> >>>>>
> >>>>> Dear list,
> >>>>>
> >>>>> in my application, I would like to display a vtkRenderWindow for user
> >>>>> interaction, but I also would like to use off-screen functionality
> >>>>> simultaneously to render pre-defined views / snapshots that are shown
> >>>>> as static images, like "thumbnails" for different datasets.
> >>>>>
> >>>>> This was possible in VTK 5.10 on linux (by creating a dedicated
> >>>>> vtkRenderWindow per thumbnail, setting OffScreenRenderingOn,
> >>>>> rendering and capturing the resulting image with a
> >>>>> vtkWindowToImageFilter).
> >>>>>
> >>>>> In VTK-7.0.0.rc1, using the OpenGL rendering backend on Mesa 9.2.3, I
> >>>>> now get a segfault with the following backtrace:
> >>>>>
> >>>>> (gdb) bt
> >>>>> #0 0x00007fffd045db90 in xcb_glx_get_string_string_length ()
> >>>>> from /usr/lib64/libxcb-glx.so.0
> >>>>> #1 0x00007fffd0cce605 in ?? () from /usr/lib64/libGL.so.1
> >>>>> #2 0x00007fffd0ccc2b6 in ?? () from /usr/lib64/libGL.so.1
> >>>>> #3 0x00007fffd14cd086 in
> >>>>> vtkOpenGLExtensionManager::ReadOpenGLExtensions() ()
> >>>>> from
> >>>>> /import/QUINTA/non-public/software/linux-install/quinta_
> gcc_debug/lib
> >>>>> /libvtkRenderingOpenGL-7.0.so.1
> >>>>> #4 0x00007fffd14cbd50 in vtkOpenGLExtensionManager::Update() ()
> >>>>> from
> >>>>> /import/QUINTA/non-public/software/linux-install/quinta_
> gcc_debug/lib
> >>>>> /libvtkRenderingOpenGL-7.0.so.1
> >>>>> #5 0x00007fffd14cafd7 in
> >>>>> vtkOpenGLExtensionManager::ExtensionSupported(char const*) ()
> >>>>> from
> >>>>> /import/QUINTA/non-public/software/linux-install/quinta_
> gcc_debug/lib
> >>>>> /libvtkRenderingOpenGL-7.0.so.1
> >>>>> #6 0x00007fffd14ec8ea in vtkOpenGLRenderWindow::OpenGLInitContext()
> >>>>> ()
> >>>>> from
> >>>>> /import/QUINTA/non-public/software/linux-install/quinta_
> gcc_debug/lib
> >>>>> /libvtkRenderingOpenGL-7.0.so.1
> >>>>> #7 0x00007fffd14eae6d in vtkOpenGLRenderWindow::OpenGLInit() ()
> >>>>> from
> >>>>> /import/QUINTA/non-public/software/linux-install/quinta_
> gcc_debug/lib
> >>>>> /libvtkRenderingOpenGL-7.0.so.1
> >>>>> #8 0x00007fffd1576932 in
> >>>>> vtkXOpenGLRenderWindow::CreateOffScreenWindow(int, int) ()
> >>>>>
> >>>>> Besides a remark that probably there could be better error handling
> >>>>> than just letting the app crash without an exception being thrown, I
> >>>>> would like to know if joint on-screen rendering and off-screen
> >>>>> rendering is still possible somehow with VTK-7.0.0.
> >>>>>
> >>>>> I have made two approaches when configuring via CMake: (i) Setting
> >>>>> VTK_OPENGL_HAS_OSMESA=True (no effect, I think I remember that in
> >>>>> earlier versions, this allowed OSMESA_INCLUDE_DIR etc. to be set;
> >>>>> this is not the case anymore, so does this flag still do something?
> >>>>> Note that for VTK 5.10 as mentioned above I did not have to set this
> >>>>> explicitly), (ii) Setting USE_OFFSXCREEN_EGL=True - resulting in an
> >>>>> error that this could not be combined with VTK_USE_X.
> >>>>>
> >>>>> On Windows, combining on-screen and off-screen rendering as described
> >>>>> in the second paragraph is possible.
> >>>>>
> >>>>> Any suggestions would be welcome, the Wiki page I have found on this
> >>>>> topic is not fully understandable to me
> >>>>> (http://www.vtk.org/Wiki/VTK/OSMesa_Support; does this mean that I
> >>>>> have to switch on VTK_OPENGL_HAS_OSMESA or not?...)
> >>>>>
> >>>>> Thanks,
> >>>>>
> >>>>> sophonet
> >>>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> Powered by www.kitware.com
> >>>>>
> >>>>> Visit other Kitware open-source projects at
> >>>>> http://www.kitware.com/opensource/opensource.html
> >>>>>
> >>>>> Please keep messages on-topic and check the VTK FAQ at:
> >>>>> http://www.vtk.org/Wiki/VTK_FAQ
> >>>>>
> >>>>> Search the list archives at: http://markmail.org/search/?q=vtkusers
> >>>>>
> >>>>> Follow this link to subscribe/unsubscribe:
> >>>>> http://public.kitware.com/mailman/listinfo/vtkusers
> >>>>
> >>>> _______________________________________________
> >>>> Powered by www.kitware.com
> >>>>
> >>>> Visit other Kitware open-source projects at
> >>>> http://www.kitware.com/opensource/opensource.html
> >>>>
> >>>> Please keep messages on-topic and check the VTK FAQ at:
> >>>> http://www.vtk.org/Wiki/VTK_FAQ
> >>>>
> >>>> Search the list archives at: http://markmail.org/search/?q=vtkusers
> >>>>
> >>>> Follow this link to subscribe/unsubscribe:
> >>>> http://public.kitware.com/mailman/listinfo/vtkusers
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> Powered by www.kitware.com
> >>>
> >>> Visit other Kitware open-source projects at
> >>> http://www.kitware.com/opensource/opensource.html
> >>>
> >>> Please keep messages on-topic and check the VTK FAQ at:
> >>> http://www.vtk.org/Wiki/VTK_FAQ
> >>>
> >>> Search the list archives at: http://markmail.org/search/?q=vtkusers
> >>>
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> >>
> >> _______________________________________________
> >> Powered by www.kitware.com
> >>
> >> Visit other Kitware open-source projects at
> >> http://www.kitware.com/opensource/opensource.html
> >>
> >> Please keep messages on-topic and check the VTK FAQ at:
> >> http://www.vtk.org/Wiki/VTK_FAQ
> >>
> >> Search the list archives at: http://markmail.org/search/?q=vtkusers
> >>
> >> Follow this link to subscribe/unsubscribe:
> >> http://public.kitware.com/mailman/listinfo/vtkusers
> >
> > _______________________________________________
> > Powered by www.kitware.com
> >
> > Visit other Kitware open-source projects at
> > http://www.kitware.com/opensource/opensource.html
> >
> > Please keep messages on-topic and check the VTK FAQ at:
> > http://www.vtk.org/Wiki/VTK_FAQ
> >
> > Search the list archives at: http://markmail.org/search/?q=vtkusers
> >
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> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/
> opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at:
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>
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>
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--
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971
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