From 21942ff7b9277ea9b231ad85c2c15cad984f1a4b Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Fri, 30 Jul 2021 15:28:53 +0200
Subject: [PATCH] arb:: fixed shape id info in unmirror

---
 arbitrile.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arbitrile.cpp b/arbitrile.cpp
index 97081147..3dc63964 100644
--- a/arbitrile.cpp
+++ b/arbitrile.cpp
@@ -266,6 +266,8 @@ EX void unmirror() {
   int s = isize(sh);
   for(int i=0; i<s; i++)
     sh.push_back(sh[i]);
+  for(int i=0; i<2*s; i++)
+    sh[i].id = i;
   for(int i=s; i<s+s; i++) {
     for(auto& v: sh[i].vertices) 
       v[1] = -v[1];