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diff --git a/thirdparty/assimp/include/assimp/TinyFormatter.h b/thirdparty/assimp/include/assimp/TinyFormatter.h
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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2019, assimp team
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+
+/** @file  TinyFormatter.h
+ *  @brief Utility to format log messages more easily. Introduced
+ *    to get rid of the boost::format dependency. Much slinker,
+ *    basically just extends stringstream.
+ */
+#ifndef INCLUDED_TINY_FORMATTER_H
+#define INCLUDED_TINY_FORMATTER_H
+
+#include <sstream>
+
+namespace Assimp {
+namespace Formatter {
+
+// ------------------------------------------------------------------------------------------------
+/** stringstream utility. Usage:
+ *  @code
+ *  void writelog(const std::string&s);
+ *  void writelog(const std::wstring&s);
+ *  ...
+ *  writelog(format()<< "hi! this is a number: " << 4);
+ *  writelog(wformat()<< L"hi! this is a number: " << 4);
+ *
+ *  @endcode */
+template < typename T,
+    typename CharTraits = std::char_traits<T>,
+    typename Allocator  = std::allocator<T>
+>
+class basic_formatter
+{
+
+public:
+
+    typedef class std::basic_string<
+        T,CharTraits,Allocator
+    > string;
+
+    typedef class std::basic_ostringstream<
+        T,CharTraits,Allocator
+    > stringstream;
+
+public:
+
+    basic_formatter() {}
+
+    /* Allow basic_formatter<T>'s to be used almost interchangeably
+     * with std::(w)string or const (w)char* arguments because the
+     * conversion c'tor is called implicitly. */
+    template <typename TT>
+    basic_formatter(const TT& sin)  {
+        underlying << sin;
+    }
+
+
+    // The problem described here:
+    // https://sourceforge.net/tracker/?func=detail&atid=1067632&aid=3358562&group_id=226462
+    // can also cause trouble here. Apparently, older gcc versions sometimes copy temporaries
+    // being bound to const ref& function parameters. Copying streams is not permitted, though.
+    // This workaround avoids this by manually specifying a copy ctor.
+#if !defined(__GNUC__) || !defined(__APPLE__) || __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
+    explicit basic_formatter(const basic_formatter& other) {
+        underlying << (string)other;
+    }
+#endif
+
+
+public:
+
+    operator string () const {
+        return underlying.str();
+    }
+
+
+    /* note - this is declared const because binding temporaries does only
+     * work for const references, so many function prototypes will
+     * include const basic_formatter<T>& s but might still want to
+     * modify the formatted string without the need for a full copy.*/
+    template <typename TToken>
+    const basic_formatter& operator << (const TToken& s) const {
+        underlying << s;
+        return *this;
+    }
+
+    template <typename TToken>
+    basic_formatter& operator << (const TToken& s) {
+        underlying << s;
+        return *this;
+    }
+
+
+    // comma operator overloaded as well, choose your preferred way.
+    template <typename TToken>
+    const basic_formatter& operator, (const TToken& s) const {
+        underlying << s;
+        return *this;
+    }
+
+    template <typename TToken>
+    basic_formatter& operator, (const TToken& s) {
+        underlying << s;
+        return *this;
+    }
+
+    // Fix for MSVC8
+    // See https://sourceforge.net/projects/assimp/forums/forum/817654/topic/4372824
+    template <typename TToken>
+    basic_formatter& operator, (TToken& s) {
+        underlying << s;
+        return *this;
+    }
+
+
+private:
+    mutable stringstream underlying;
+};
+
+
+typedef basic_formatter< char > format;
+typedef basic_formatter< wchar_t > wformat;
+
+} // ! namespace Formatter
+
+} // ! namespace Assimp
+
+#endif