[vtkusers] Help for Using OpenGL with VTK

[David Doria]

2012/2/8 sangmaxie <sangmaxie at gmail.com>:
> Hi:
>     I want to use OpenGL with VTK. For example, I want to draw a line with
> OpenGL like this:
>                    glBegin (GL_LINES);
>                    glColor3f(1.0,0.0,0.0);
>                    glVertex2f (-2.5, 2.5);
>                    glVertex2f (2.5, -2.5);
>                    glEnd ();
>    And I want to render and display it with VTK classes, like vtkRenderer
> and vtkRenderWindow. But I don't know how to deal with it.
>    The following codes can't work;
>
>                    renWin->Render();
>                    glBegin (GL_LINES);
>                    glVertex2f (-2.5, 2.5);
>                    glVertex2f (2.5, -2.5);
>                    glEnd ();
>                    iren->Start();
>
>    Can you give me some examples and details? Thank you very much!
>
> Sangma Xie

If you're using VTK, why use OpenGL calls directly instead of
something like this:

http://www.vtk.org/Wiki/VTK/Examples/Cxx/GeometricObjects/Line
?
David