if (vertexes.size() > 2) {
N3Point3D c = (N3Point3D) vertexes.elementAt(1);
N3Point3D e1 = (N3Point3D) vertexes.elementAt(0);
N3Point3D e2 = (N3Point3D) vertexes.elementAt(2);
normal = new N3Vector3D(e2.x - c.x, e2.y - c.y, e2.z - c.z);
normal.crossProduct(new N3Vector3D(e1.x - c.x, e1.y - c.y, e1.z
- c.z));
normal.normalize();
}
return normal;
}