From 94becf120bf0fe6b779fe952b68e73f1e62c90f1 Mon Sep 17 00:00:00 2001
From: Enrico Turri <enricoturri@seznam.cz>
Date: Fri, 4 Jan 2019 14:53:01 +0100
Subject: [PATCH] Fixed euler angles calculation for the singular case

---
 src/libslic3r/Geometry.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libslic3r/Geometry.cpp b/src/libslic3r/Geometry.cpp
index 317ca4f65..ba9c7b00e 100644
--- a/src/libslic3r/Geometry.cpp
+++ b/src/libslic3r/Geometry.cpp
@@ -1194,9 +1194,9 @@ Vec3d extract_euler_angles(const Eigen::Matrix<double, 3, 3, Eigen::DontAlign>&
     }
     else
     {
-        angles(0) = ::atan2(-rotation_matrix(1, 2), rotation_matrix(1, 1));
+        angles(1) = 0.0;
         angles(1) = ::atan2(-rotation_matrix(2, 0), sy);
-        angles(2) = 0.0;
+        angles(2) = (angles(1) >-0.0) ? ::atan2(rotation_matrix(1, 2), rotation_matrix(1, 1)) : ::atan2(-rotation_matrix(1, 2), rotation_matrix(1, 1));
     }
 
     return angles;