# problem about LookingGlassVTKModule

**URL:** https://discourse.vtk.org/t/problem-about-lookingglassvtkmodule/6339
**Category:** Support
**Created:** [August 10, 2021, 1:11am UTC](https://discourse.vtk.org/t/problem-about-lookingglassvtkmodule/6339 "2021-08-10T01:11:01Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![ZUNTING\_HU](https://discourse.vtk.org/user_avatar/discourse.vtk.org/zunting_hu/32/3669_2.png) [@ZUNTING\_HU](https://discourse.vtk.org/u/ZUNTING_HU)
#### Post date: [August 10, 2021, 1:11am UTC](https://discourse.vtk.org/t/problem-about-lookingglassvtkmodule/6339/1 "2021-08-10T01:11:01Z")

</div>

Hi~  
I am using LookingGlassVTKModule these days. I build vtk with LookingGlassVTKModule successfully. But, when I debug the test project, the function “vtkRegressionTestImage(renderWindow)” always return vtkRegressionTester::NOT\_RUN.

And the lookingGlass shows empty always.  
Any suggestions will be appreciated! Please return this email, It’s very important!