[vtkusers] Getting back OpenGL Context after data display/visualization using VTK

[Rudra Poudel]

Hi All, 

- My application has Frame Buffer Object (FBO) for off-screen rendering ( I used GLUT to init OpenGL Context- i.e. trick of invisible GLUT window) 

- When I display/visualize data using VTK function/class as obviously it take-over/create-new OpenGL context 
- Then I delete all VTK related functions/classes
- Now when I tried to work with FBO it does-not-work/has-invalid-state. 

Questions, 
1. What is the best/easiest solution to get back OpenGL Context after data display/visualization using VTK? 
2. Might be building VTK without OpenGL support- however this looks impossible or ...? 

Thank you so much, 
Rudra
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