[vtkusers] Using OpenGl with VTK

[Mohammed Amine SAHTARI]

I want to add an OpenGl code in an application of VTK.

For this purpose, I try to draw lines using commands OpenGL.:

*1) I add this on the top of the program :*

#include <GL/gl.h>

*2) I place my OpenGL commands after renWin->Render() but before
iren->Start()** :  *

renWin->Render();

    glBegin (GL_LINES);
       glVertex2f (-2.5, 2.5);
       glVertex2f (2.5, -2.5);
     glEnd ();

iren->Start();


*But it doesn't appears.*

did I miss something ? How can I do this work ?

Looking forward to hear from you soon,

Amine
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