From 596b88cf94b1d2820adbf3397570c77b2f0e0642 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Francisco=20Monta=C3=B1=C3=A9s=20Garc=C3=ADa?=
 <fco.gmon@gmail.com>
Date: Wed, 21 Sep 2016 12:43:48 +0200
Subject: [PATCH] Complete each face with 2nd triangle.

---
 Engine/source/collision/abstractPolyList.cpp | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/Engine/source/collision/abstractPolyList.cpp b/Engine/source/collision/abstractPolyList.cpp
index c33a963bf..bba3d424a 100644
--- a/Engine/source/collision/abstractPolyList.cpp
+++ b/Engine/source/collision/abstractPolyList.cpp
@@ -56,17 +56,24 @@ void AbstractPolyList::addBox(const Box3F &box, BaseMatInstance* material)
    pos.x += dx; addPoint(pos);
 
    for (S32 i = 0; i < 6; i++) {
-      begin(material, i);
       S32 v1 = base + PolyFace[i][0];
       S32 v2 = base + PolyFace[i][1];
       S32 v3 = base + PolyFace[i][2];
       S32 v4 = base + PolyFace[i][3];
+      // First triangle
+      begin(material, i);
       vertex(v1);
       vertex(v2);
       vertex(v3);
-      vertex(v4);
       plane(v1, v2, v3);
       end();
+      // Second triangle
+      begin(material, i);
+      vertex(v3);
+      vertex(v4);
+      vertex(v1);
+      plane(v3, v4, v1);
+      end();
    }
 }