Flattening 3d triangle

Hello, flattening 3d triangle is very useful for all kinds of projects, and it's not available at this moment on V2, so here's a little function that does it. It comes from this discussion : https://stackoverflow.com/a/8051489
function d2ize(p){ var x0 = p[0][0], y0 = p[0][1], z0 = p[0][2], x1 = p[1][0], y1 = p[1][1], z1 = p[1][2], x2 = p[2][0], y2 = p[2][1], z2 = p[2][2] var X0 = 0, Y0 = 0 var X1 = Math.sqrt((x1  x0)*(x1  x0) + (y1  y0)*(y1  y0) + (z1  z0)*(z1  z0)), Y1 = 0 var X2 = ((x1  x0) * (x2  x0) + (y1  y0) * (y2  y0) + (z1  z0) * (z2  z0)) / X1, Y2 = Math.sqrt((x2  x0)*(x2  x0) + (y2  y0)*(y2  y0) + (z2  z0)*(z2  z0)  X2*X2) return [[X0, Y0], [X1, Y1], [X2, Y2]] }

Thank you. I only work with triangulated models for coding simplicity, even if later (for designs clarity) I usually remove walls between coplanar neighbours. I will certainly soon start to make V2 versions of my code, was only missing this, but for the moment I'm making a vanilla JS pattern editor.

Cool. But be careful as the boolean operations can create polygons with more than three (3) vertices. Also, some of the primitives create polygons with four (4) vertices.