Hi Pilou,

> What is the AI file: Circle or ellipse?

In the case that you show there, with a slanted circle (not aligned to any world axis), you would get an ellipse in the AI file except in the one special case where you had the 3D view looking right straight down on the circle and you set the Projection view option to "3D".

The curves in the AI file will look the same as the curves that you see on the screen in the viewport. So if you have a circle which appears from a view as an ellipse, when you export to AI you will get the ellipse curve.

If you want to export circles instead of ellipses, then you would draw them in the top view and set Projection view = "Top".

- Michael