[osg-users] Insert custom Open GL code

[Claudio Arduino]

Hi,
i Need to insert custom OpenGl code like this:

    glBegin(GL_TRIANGLE_STRIP);
    glColor3f(1.0, 0.0, 1.0);
    glVertex3i(0,0,0);
    glColor3f(1.0, 0.0, 1.0);
    glVertex3i(2000,2000,0);
    glVertex3i(0, 2000,0);
    glEnd();
    glFlush();

i have tried to insert this code in osgCallback code:

struct DrawableUpdateCallback : public osg::Drawable::UpdateCallback
{
    virtual void update(osg::NodeVisitor*, osg::Drawable* drawable)
    {
        std::cout<<"Drawable update callback "<<drawable<<std::endl;
  glBegin(GL_TRIANGLE_STRIP);

 glColor3f(1.0, 0.0, 1.0);
  glVertex3i(0,0,50);
glColor3f(1.0, 0.0, 1.0);
       glVertex3i(20000,20000,50);
       glVertex3i(0, 20000,50);
    glEnd();
    glFlush();
    }
};

the code is executed but the triangles don't appear to the screen...
i am a newbie in OpenGl....

please help me...:-)

thanks

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