Greetings. I am the author of the last topic on the request of a perspective ellipse. I did not correctly describe how it should work in theory. In the context of algorithms and formulas. But in the end, you did everything right. And I'm very happy about it. There is one detail left. I apparently completely forgot to mention it in previews request. Here we need a second tool, where the ellipse will be the concentric. As already existing without perspective. Called Concentric Ellipse I don't know if you are aware of this, if you planned it. I just wrote a request. And yes. It's my own fault for not posting this in the previous thread. Actually... In drawing only the Perspective Concentric Ellipse is important. Previews: https://bugs.kde.org/show_bug.cgi?id=405643