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Created by Steven Roodhorst@s.roodhorst

Offscreen rendering shows window when built with VTK_USE_X on Ubuntu.

VTK example with offscreen rendering ON shows a quick window popup when built with VTK_USE_X. I read through the forums and other VTK issues 11911 and 11912, which show often that the problem is fixed, but I still have the issue. I looked in the code and the suggested fixes are already there. Does someone have an idea how to prevent the popup window?

I use VTK 8.1 built on Ubuntu 16.04 LTS with CMake 3.12 and libxt-dev (1:1.1.5-0ubuntu1).

CMake configuration:

cmake \
  -DBUILD_EXAMPLES:bool=OFF \
  -DBUILD_SHARED_LIBS:bool=OFF \
  -DBUILD_TESTING:bool=OFF \
  -DCMAKE_BUILD_TYPE:string="Release" \
  -DCMAKE_CXX_FLAGS:string=-fPIC\ -std=c++14  \
  -DCMAKE_CXX_FLAGS_RELEASE:string=-O3\ -DNDEBUG\ -fvisibility=hidden\ -fvisibility-inlines-hidden \
  -DCMAKE_C_FLAGS:string=-fPIC \
  -DCMAKE_C_FLAGS_RELEASE:string=-O3\ -DNDEBUG\ -fvisibility=hidden \
  -DModule_vtkWebCore:bool=ON \
  -DVTK_Group_Rendering:bool=ON \
  -DVTK_Group_StandAlone:bool=ON \
  -DVTK_USE_X:bool=ON \
  ../source

The Example I use for offscreen rendering is a combination of the VTK StackedPlot example and an implementation of an image to string encoding. Here the CMakeLists.txt

I already tried the same on a recent VTK master, which posed the same problem. Should I try to use another OpenGL backend like using VTK_OPENGL_HAS_EGL?

Thanks beforehand.

Edited by Steven Roodhorst