# Render window doesn't appear when running examples

**URL:** https://discourse.vtk.org/t/render-window-doesnt-appear-when-running-examples/3826
**Category:** Support
**Created:** [July 22, 2020, 12:51pm UTC](https://discourse.vtk.org/t/render-window-doesnt-appear-when-running-examples/3826 "2020-07-22T12:51:06Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![JenJen](https://discourse.vtk.org/user_avatar/discourse.vtk.org/jenjen/32/1211_2.png) [@JenJen](https://discourse.vtk.org/u/JenJen)
#### Post date: [July 22, 2020, 12:51pm UTC](https://discourse.vtk.org/t/render-window-doesnt-appear-when-running-examples/3826/1 "2020-07-22T12:51:06Z")

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I am new to VTK. I have installed the latest version, using CMake and Visual Studio 2017 on Windows 10. I have download and compiled c++ examples (Sphere, PolyDataToImageData, and Glyph3DImage) but when I run the executables not rendering window appears, There are no error messages either. Has anyone got any ideas? This seems to be an OpenGL related issue. Many thanks

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### Author: ![lassoan](https://discourse.vtk.org/user_avatar/discourse.vtk.org/lassoan/32/50_2.png) [@lassoan](https://discourse.vtk.org/u/lassoan)
#### Post date: [July 22, 2020, 3:55pm UTC](https://discourse.vtk.org/t/render-window-doesnt-appear-when-running-examples/3826/2 "2020-07-22T15:55:50Z")

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By default, VTK tests are executed in non-interactive mode and displaying of render windows are avoided as much as possible. You may try to run the test in interactive mode by specifying `-I` command-line argument.