In perspective view (a projection), when you look at the circle from different angles, it becomes an ellipse. (also in the world). Most things make sense with perspective, but I don't see why the center of the circle doesn't match the center of the ellipse (just the fact of geometric intersection?). I like to draw, so I'm curious.
2026-05-16 18:29:23.1778956163
In perspective, circle becomes an ellipse. but why isn't the center of circle, center of ellipse?
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This is explained without words in the following schematic where the bottom black line segment is the circle lying horizontally, and projection plane is shown in green. Point O is where all the rays converge. It can be seen that the projection of the center of the circle is not halfway between the two extremities of the projection of the circle.