public void DrawRect(Point3D p1, Point3D p2, Point3D p3, Point3D p4, Point3D normal)
{
Point3D pm = Point3D.GetLineMidpoint(p1, p3);
fScene.DrawTriangle(p1, pm, p2, normal);
fScene.DrawTriangle(p2, pm, p3, normal);
fScene.DrawTriangle(p3, pm, p4, normal);
fScene.DrawTriangle(p4, pm, p1, normal);
/*OpenGL.glBegin(OpenGL.GL_POLYGON);
* OpenGL.glVertex3f(p1.X, p1.Y, p1.Z);
* OpenGL.glVertex3f(p2.X, p2.Y, p2.Z);
* OpenGL.glVertex3f(p3.X, p3.Y, p3.Z);
* OpenGL.glVertex3f(p4.X, p4.Y, p4.Z);
* OpenGL.glEnd();*/
}