149KiB, 120x120, 120px-2-circles_hypotrochoid.gif View SameGoogleiqdbSauceNAO Anonymous Wed 30 Jun 05:43:44 2021 No.13341083 ViewReplyOriginalReport Quoted By: >>13341729 >>13341929 how do i know that u = x/z and v=y/z is the correct formulation of perspective projection from 3d space to 2d screen?