For wireframe objects like the one in the OP (which actually does use a perspect...

Matheus28 on July 17, 2017 | parent | context | favorite | on: Show HN: 3D Renderer Built using 2D HTML Canvas

For wireframe objects like the one in the OP (which actually does use a perspective projection it seems), that's not really a problem. Just have your own code that does all the matrix multiplication, and you get a point you can plug right into moveTo/lineTo