This is a demo how to use the fisheye effect to display circles on the ground in 3D. Arrows or WASD and U/X - Z/Y buttons to change Y position in 3D. Jump with space or 0. Planet rings: https://scratch.mit.edu/projects/813943942/ Okay, it's not the exact 3D circle rendering, but close to it. The smaller circles almost perfect, the big one is a pie, but let's compare it with a simple fixed ellipse. During development of Twilight Flight 3D https://scratch.mit.edu/projects/812872431 I should display big flat areas, fields, and the top of them the airfield and other things. The costume of the field is a green elongated ellipse, and a gray for airfields. The edge of the ellipses look very bad, but the error is not very noticeable. Unfortunately, this fisheye technique in HD and full screen sometimes crashes the Scratch, it can hang the system, so I continue to research to solve this problem. I tried in that project but I couldn't find any parameter values that would even come close to the current look. Maybe in an other project... In this project, sometimes the ball seems on the circle but it falls, and the different sizes seem higher or lower. Older idea for the similar 3D fisheye is this project (3D Brick Wall by fisheye effect): https://scratch.mit.edu/projects/695316599/ Thanks to @l3ccm for the first fisheye 3D steps (what I found): https://scratch.mit.edu/projects/534529231/ #3D #fisheye #demo