Just the functional assimp lib rather than the entire assimp repository unnecessarily.

Engine/lib/assimp/code/XFileExporter.cpp

@@ -2,8 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------
 
-Copyright (c) 2006-2018, assimp team
-
+Copyright (c) 2006-2017, assimp team
 
 All rights reserved.
 
@@ -47,15 +46,15 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "XFileExporter.h"
 #include "ConvertToLHProcess.h"
-#include <assimp/Bitmap.h>
-#include <assimp/BaseImporter.h>
-#include <assimp/fast_atof.h>
+#include "Bitmap.h"
+#include "BaseImporter.h"
+#include "fast_atof.h"
 #include <assimp/SceneCombiner.h>
 #include <assimp/DefaultIOSystem.h>
 #include <ctime>
 #include <set>
 #include <memory>
-#include <assimp/Exceptional.h>
+#include "Exceptional.h"
 #include <assimp/IOSystem.hpp>
 #include <assimp/scene.h>
 #include <assimp/light.h>
@@ -132,7 +131,7 @@ void XFileExporter::WriteFile()
 {
     // note, that all realnumber values must be comma separated in x files
     mOutput.setf(std::ios::fixed);
-    mOutput.precision(16); // precision for double
+    mOutput.precision(16); // precission for double
 
     // entry of writing the file
     WriteHeader();