Gl.glViewport(0, 0, simpleOpenGlControl1.Width, simpleOpenGlControl1.Height);
Gl.glMatrixMode(Gl.GL_PROJECTION);
Gl.glLoadIdentity();
Glu.gluPerspective(45.0f,
(float)simpleOpenGlControl1.Width / (float)simpleOpenGlControl1.Height,
0.1f, 100.0f);
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();