From 7352226989f4471704002b2407bc4435afabb286 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philippe=20Rivi=C3=A8re?= <fil@rezo.net>
Date: Sun, 10 Nov 2024 18:09:22 +0100
Subject: [PATCH] due to numeric instability, Chrome was choosing the wrong
 orientation at the north pole, effectively putting the cubic map upside down.

closes #75
---
 src/cubic.js              | 3 +--
 src/polyhedral/voronoi.js | 5 ++++-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/cubic.js b/src/cubic.js
index 82d6bb2..dc86c73 100644
--- a/src/cubic.js
+++ b/src/cubic.js
@@ -1,7 +1,7 @@
 /*
  * Cubic map
  *
- * Implemented for D3.js by Enrico Spinielli (2017) and Philippe Rivière (2017, 2018)
+ * Implemented for D3.js by Enrico Spinielli (2017) and Philippe Rivière (2017—2024)
  *
  */
 import voronoi from "./polyhedral/voronoi.js";
@@ -38,7 +38,6 @@ export default function() {
   return voronoi()
     .polygons(polygons)
     .parents(parents)
-    .angle(0)
     .scale(96.8737)
     .center([135, -45])
     .rotate([120,0]);
diff --git a/src/polyhedral/voronoi.js b/src/polyhedral/voronoi.js
index 11fa9e9..4ba7efd 100644
--- a/src/polyhedral/voronoi.js
+++ b/src/polyhedral/voronoi.js
@@ -12,7 +12,10 @@ import polyhedral from "./index.js";
 const faceProjection0 = (face) => gnomonic()
   .scale(1)
   .translate([0, 0])
-  .rotate([-face.site[0], -face.site[1]]);
+  .rotate([
+    Math.abs(face.site[1]) > 89.99999999 ? 0 : -face.site[0],
+    -face.site[1]
+  ]);
 
 export default function(
   parents = [],