From 29d14271547d9b84b892f7bded4e8f2cd0b4fce4 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sun, 27 Oct 2019 00:45:34 +0200
Subject: [PATCH] fixed confusion in 3D elliptic spaces

---
 reg3.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/reg3.cpp b/reg3.cpp
index 074aec1e..5bd50129 100644
--- a/reg3.cpp
+++ b/reg3.cpp
@@ -887,7 +887,9 @@ EX namespace reg3 {
         dynamicval<hrmap*> cm(currentmap, binary_map);
         T = binary_map->relative_matrix(p2.first, p1.first);
         }
-      return inverse(p1.second) * T * p2.second;
+      T = inverse(p1.second) * T * p2.second;
+      if(elliptic && T[LDIM][LDIM] < 0) T = centralsym * T;
+      return T;
       }
     
     vector<hyperpoint> get_vertices(cell* c) override {