Perspective transform revisited

[denzjos]

Well, I discovered that the flange is a drawing of an ellips.The clock is a photograph or a rendered drawing that have a perspective distortion.The drawing of the flange is 3D drawing in isometric projection. The ellips (green) is not distorted but it is just a angled view. That is why it is easy to find the center-point. To find the center lines you must draw a circle (yellow - here divided in 12, not required) with this point as a center point. The 4 points where the circle is intersecting the ellips are the vertices of a rectangle (red). Lines from the center-point of the circle through the the middle of the sides of the rectangle are the center lines (red and one is discovered by a cyan line) of the ellips. I just tested the plugin to see if it is working to restore the front view of the flange with the holes and the cavity.