Hallo,
in my drawin constuction (in VB.NET) i like have a diffuse light, shaddow, but i don' know. what have i to do?

in c++ looks like so:

  GLfloat LPosition[4]=       //Lichtquellenrichtung
   {1.0F,1.0F,1.0F,0.0F};     //in Eye-Koor. definieren

  glLightfv(GL_LIGHT0,GL_POSITION,&LPosition[0]);

  GLfloat LModelAmbient[4]   //Umgebungslicht Modell
    ={0.2F,0.2F,0.2F,1.0F};  //Umgebungslicht Def.

  glLightModelfv( 
    GL_LIGHT_MODEL_AMBIENT, Modell   &LModelAmbient[0]);    
  glLightModeli(GL_LIGHT_MODEL_TWO_SIDE,1); 
  glColorMaterial( 
    GL_FRONT,              
    GL_AMBIENT_AND_DIFFUSE);