How to use original OpenGL in VTK program?

Support
1

I am new to vtk, can you tell me how to use vtk and opengl in the one window (such as QVTKOpenGLWindow)?
For examle, there is a cube painted by vtk, how to add a triangle by opengl in same window?
Thanks.

2

Some things have been rendered in the QOpenGLWindow through opengl, how to add more through vtk to render, vtkExternalOpenGLRenderWindow?

3

Hello, friend,

Please, take a look at this: https://vtk.org/Wiki/VTK/Examples/Cxx/Visualization/RenderPassExistingContext But its approach is the opposite: you create a standalone OpenGL window and then pass its OpenGL context to VTK to use for rendering.

regards,

Paulo

4

Hi, the link redirects to the examples page instead of the specific example you mentioned, could please share it again or post the code of the example here?

5

Unfortunately they took down the page without providing a replacement. At least I could not readily locate the example. Maybe it was renamed. Sorry.

7

I found it on Wayback Machine web archiving service: VTK/Examples/Cxx/Visualization/RenderPassExistingContext - KitwarePublic

I recommend saving the HTML of the page or having it re-uploaded to the new VTK examples site. Wayback Machine has been around for many years, but who knows how long it will remain available.

8

That’s great, thank you very much! So if I understand correctly, in this example I render my volume in VTK and pass it to an OpenGL context for visualisation?

9

You’re welcome. It’s more like: you create a standalone OpenGL window and then pass its OpenGL context to VTK to use for rendering.