From 1c653a0315b04269a2e7385efad6a033ddad2420 Mon Sep 17 00:00:00 2001
From: Howard Trickey <howard.trickey@gmail.com>
Date: Sat, 24 Oct 2020 17:36:38 -0400
Subject: Fix T81999, Boolean Exact+Self Difference fails.

A cell with winding number > 1 for the second operand was incorrectly
included in the output.
---
 source/blender/blenlib/intern/mesh_boolean.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/blender/blenlib/intern/mesh_boolean.cc b/source/blender/blenlib/intern/mesh_boolean.cc
index 169687cf9d1..bad0b84d10f 100644
--- a/source/blender/blenlib/intern/mesh_boolean.cc
+++ b/source/blender/blenlib/intern/mesh_boolean.cc
@@ -2068,7 +2068,7 @@ static bool apply_bool_op(BoolOpType bool_optype, const Array<int> &winding)
         return true;
       }
       for (int i = 1; i < nw; ++i) {
-        if (winding[i] == 1) {
+        if (winding[i] >= 1) {
           return false;
         }
       }
-- 
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