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@GrantsPirate wrote:
A true isometric projection will result in the object being drawn about 2/3 the actual size. Even with an isometric drawing the ellipse can't be larger than the circle is it made to represent. I think of a can of beans and looking at the top it is a circle. Then I can rotate the can so the top shows as an ellipse but it can never be larger that the diameter of the circle.
That may be the case if you tilt the world about only one axis [you're picturing the X or Y axis, I imagine]. But not when it's tilted isometrically, which involves all three axes, and that matters. Think of a square drawn in isometric projection, like the one in the OP's original image around the larger Ellipse, and in this image:
You can dimension that square along its edges, and they'll represent the "real-world" size of the square, because they're parallel to the isometric axes. But the diagonal from upper left to lower right is longer than the diagonal of such a square when viewed head-on, and the other diagonal shorter, and you can't dimension along those and get "real" results, because they're not parallel to the isometric axes. Same for the major and minor axes of an Ellipse, compared to the circle of which it is a projection -- they get stretched exactly as the diagonals in that square do, one stretched longer and the other shorter than the "reality" they represent.
Putting in the Ellipse representing a circle in isometric projection, and the corresponding Circle viewed head-on: