@WelshPixie Doing the Delaunay part first does seem like the right way to do it, even if what you want is only the Voronoi diagram, since that way the triangles guide you in making the bisectors meet in the right places. Some of the dual pairs of edges seem a bit non-perpendicular in this example, though...
@11011110 Yeah they probably are. I'm still not doing it entirely precisely (i.e. marking the center point of each three triangle edges then drawing 90-degree lines through them and marking the point where they meet) because I'm impatient XD
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