Polygon Models in OpenGL

• for faceted shading

  < calculate face normal n
  
  using cross product rule >
  glNormal3fv(n);
  glBegin(GL_POLYGONS);
  glVertex3fv(vert1);
  glVertex3fv(vert2);
  glVertex3fv(vert3);
  glEnd();

• for smooth shading
  glBegin(GL_POLYGONS);
  
  glNormal3fv(normal1);
  glVertex3fv(vert1);
  glNormal3fv(normal2);
  glVertex3fv(vert2);
  glNormal3fv(normal3);
  glVertex3fv(vert3);
  glEnd();

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