From c25211d29e6721df435c84bb17f630d93f4868ce Mon Sep 17 00:00:00 2001
From: tykkiman <tykkimies@protonmail.com>
Date: Fri, 2 Dec 2022 23:40:36 +0200
Subject: [PATCH] Fix point list vs plane relative position check

Situation where all points were on the plane wasn't handled.
---
 visilib/math_predicates.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/visilib/math_predicates.h b/visilib/math_predicates.h
index 29b3909..b7e8578 100644
--- a/visilib/math_predicates.h
+++ b/visilib/math_predicates.h
@@ -222,7 +222,12 @@ namespace visilib
             }
         }
 
-        if (myRight == 0)
+        if (myRight == 0 && myLeft == 0 && points.size() > 0)
+        {
+            // Relative position is on the boundary if all points were on the plane.
+            return ON_BOUNDARY;
+        }
+        else if (myRight == 0)
         {
             V_ASSERT(myLeft > 0);
             return ON_NEGATIVE_SIDE;