From 167b8825f7e3d293300bc01d19f951948c901b07 Mon Sep 17 00:00:00 2001
From: Marius Kintel <marius@kintel.net>
Date: Tue, 21 Apr 2015 01:33:25 -0400
Subject: [PATCH] Fixed bug reversing result of is_nan(), causing normals
 vectors to sometime be exported as 0 0 0. Fixes #1317

---
 src/linalg.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/linalg.h b/src/linalg.h
index 40601ec1..6e65c1be 100644
--- a/src/linalg.h
+++ b/src/linalg.h
@@ -29,7 +29,7 @@ template<typename Derived> bool is_finite(const Eigen::MatrixBase<Derived>& x) {
 }
 
 template<typename Derived> bool is_nan(const Eigen::MatrixBase<Derived>& x) {
-   return ((x.array() == x.array())).all();
+   return !((x.array() == x.array())).all();
 }
 
 BoundingBox operator*(const Transform3d &m, const BoundingBox &box);