private RectangleF ToBoundingBox2D(BoundingBoxXYZ bbox3D)
{
float left = (float)(bbox3D.Min.X);
float up = (float)(bbox3D.Min.Y);
float right = (float)(bbox3D.Max.X);
float down = (float)(bbox3D.Max.Y);
RectangleF bbox2D = new RectangleF(left, up, (right - left), (down - up));
return bbox2D;
}