[vtkusers] building vtk without opengl and rendering

[Alex Pletzer]

Hi VTK'ians,

Is it possible to build VTK without rendering? On a platform that does 
not have OpenGL? I'm working on a project which uses VTK classes but I'm 
not producing any picture. The code should run in the cloud, which does 
not have OpenGL.

I have set:

VTK_Group_Rendering             *OFF

When I configure, I get

CMake Error at 
/usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:108 (message):
    Could NOT find OpenGL (missing: OPENGL_gl_LIBRARY OPENGL_INCLUDE_DIR)
  Call Stack (most recent call first):
    /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:315 
(_FPHSA_FAILURE_MESSAGE)
    /usr/share/cmake/Modules/FindOpenGL.cmake:161 
(FIND_PACKAGE_HANDLE_STANDARD_ARGS)
    Rendering/OpenGL/CMakeLists.txt:196 (find_package)

Thanks in advance!

--Alex