From 1dece061a3e2a1199464f80ad77011cb2d820e19 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9ophile=20Bastian?= <contact@tobast.fr>
Date: Fri, 9 Feb 2018 00:53:47 +0100
Subject: [PATCH] march generator: add reverse activated points

---
 tools/gen_marching_cubes_conf.py | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/tools/gen_marching_cubes_conf.py b/tools/gen_marching_cubes_conf.py
index 899a462..8c76a14 100644
--- a/tools/gen_marching_cubes_conf.py
+++ b/tools/gen_marching_cubes_conf.py
@@ -83,6 +83,19 @@ class TriangulatedCube:
             n_act.add(transf(act))
         return TriangulatedCube(n_act, n_tri)
 
+    def reverse_activated(self):
+        all_elts = {
+            Vert.frnt_bot_l,
+            Vert.frnt_bot_r,
+            Vert.frnt_top_l,
+            Vert.frnt_top_r,
+            Vert.back_bot_l,
+            Vert.back_bot_r,
+            Vert.back_top_l,
+            Vert.back_top_r,
+        }
+        self.activated = all_elts - self.activated
+
     def activated_code(self):
         out = 0
         for act in self.activated:
@@ -181,11 +194,14 @@ def do_main(base_cases):
         index[code] = case
 
     for transf in transforms:
-        for case in base_cases:
-            tr_case = case.transform(transf)
-            code = tr_case.activated_code()
-            if index[code] is None:
-                index[code] = tr_case
+        for rev_activated in [False, True]:
+            for case in base_cases:
+                tr_case = case.transform(transf)
+                if rev_activated:
+                    tr_case.reverse_activated()
+                code = tr_case.activated_code()
+                if index[code] is None:
+                    index[code] = tr_case
 
     for (val, tri) in enumerate(index):
         if tri is None: