public override void Mouse_Down(MouseEventArgs e)
{
if (e.Button == MouseButtons.Middle)
{
//freeze camera
_camera = Editor.Camera.Clone();
_startMouseRay = _camera.GetWorldRay(new Vector2(e.X, e.Y));
_cameraPlane = new Plane(_camera.LookAt, _camera.LookAt + _camera.Right, _camera.LookAt + _camera.UpEffective);
}
}
