problem about LookingGlassVTKModule

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!