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

[Rudra Poudel]

Hi Aashish,

Thanks, just want to make sure I understood what you mean,

My program LOOP {
Step 1- I have FBO for main logic processing-  this step working fine
Step 2- I want to use VTK for my results visualization only, then close all visualization windows
Step 3- Again would like to work with my FBO here- BUMP- ERROR- FBO is invalid due to STEP 2
}

Now my questions again,
1. Aashish you mean- if I will do/call Step 2 then I could not make FBO work in Step 3? There must be some solution, isn't? The reason I am asking this question is I dont like to write my own code for visualization (re-inventing the wheel :( )
2. Can I build VTK without OpenGL support?

Many thanks,
Rudra


________________________________
 From: Aashish Chaudhary <aashish.chaudhary at kitware.com>
To: Rudra Poudel <emailrudra at yahoo.com> 
Cc: "vtkusers at vtk.org" <vtkusers at vtk.org> 
Sent: Thursday, March 8, 2012 5:29 PM
Subject: Re: [vtkusers] Getting back OpenGL Context after data display/visualization using VTK
 

On Thu, Mar 8, 2012 at 11:36 AM, Rudra Poudel <emailrudra at yahoo.com> wrote:

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. 

Since the FBO is created in different context you cannot use it in your glut context unless you created a shared FBO. It is bit tricky but doable.  

>
>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 ...? 

If you are using VTK for data filtering, sources then you can build your app where rendering is done only by your code obviously widget's wont work then. 

 

>
>Thank you so much, Rudra
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-- 
| Aashish Chaudhary 
| R&D Engineer         
| Kitware Inc.            
| www.kitware.com    
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