I can build up an oval world polygon in another way. Start off with the point at the top of the oval, the north pole, and with two points on either side of it. We can make a polar triangle fan by subdividing the triangle naturally made out of three points, based on how wide the ‘base’ is, but at least four. We can build up the points of the world polygon by splicing the left point into the beginning of the list of polygon points and the right point pushed to the end. We can make another row of triangles below the polar triangle fan out of a string of points at the base of the triangle fan and a string of points below between the two sides of the oval world polygon. This bottom, next, line is subdivided into the same number of points and subdivided again if necessary based on distance. We can make all the triangles necessary to subdivide the world polygon, then do some marching triangles to group the triangles into polygons.