From 5fed2d84eebe697c9118d4f556978b0722212149 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Wed, 15 May 2019 14:43:09 +0200
Subject: [PATCH] correct transparent wall ordering in S^3 [untested]

---
 polygons.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/polygons.cpp b/polygons.cpp
index b1b80ddc..286b7a3c 100644
--- a/polygons.cpp
+++ b/polygons.cpp
@@ -1507,6 +1507,11 @@ void draw_backside() {
 
 extern bool lshiftclick, lctrlclick;
 
+void reverse_transparent_walls() {
+  int pt = int(PPR::TRANSPARENT_WALL);
+  reverse(&ptds[qp0[pt]], &ptds[qp[pt]]);
+  }
+
 void draw_main() {
   if(sphere && DIM == 3 && pmodel == mdPerspective) {
     for(int p: {1, 0, 2, 3}) {
@@ -1527,6 +1532,7 @@ void draw_main() {
         glClearDepth(0.0f);
   #endif
         glDepthFunc(GL_GEQUAL);
+        reverse_transparent_walls();
         }
       glClear(GL_DEPTH_BUFFER_BIT);
       glhr::be_nontextured();
@@ -1538,6 +1544,7 @@ void draw_main() {
         reset_projection();
         for(auto& ptd: ptds) ptd->draw();
         }
+      if(p == 1 || p == 2) reverse_transparent_walls();
       // glflush();
       }
     }