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diff --git a/src/mesh/assimp-master/code/Common/DefaultLogger.cpp b/src/mesh/assimp-master/code/Common/DefaultLogger.cpp
new file mode 100644
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+++ b/src/mesh/assimp-master/code/Common/DefaultLogger.cpp
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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2022, 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  DefaultLogger.cpp
+ *  @brief Implementation of DefaultLogger (and Logger)
+ */
+
+// Default log streams
+#include "FileLogStream.h"
+#include "StdOStreamLogStream.h"
+#include "Win32DebugLogStream.h"
+#include <assimp/StringUtils.h>
+
+#include <assimp/DefaultIOSystem.h>
+#include <assimp/ai_assert.h>
+#include <stdio.h>
+#include <assimp/DefaultLogger.hpp>
+#include <assimp/NullLogger.hpp>
+#include <iostream>
+
+#ifndef ASSIMP_BUILD_SINGLETHREADED
+#include <mutex>
+#include <thread>
+std::mutex loggerMutex;
+#endif
+
+namespace Assimp {
+
+// ----------------------------------------------------------------------------------
+NullLogger DefaultLogger::s_pNullLogger;
+Logger *DefaultLogger::m_pLogger = &DefaultLogger::s_pNullLogger;
+
+static const unsigned int SeverityAll = Logger::Info | Logger::Err | Logger::Warn | Logger::Debugging;
+
+// ----------------------------------------------------------------------------------
+// Represents a log-stream + its error severity
+struct LogStreamInfo {
+    unsigned int m_uiErrorSeverity;
+    LogStream *m_pStream;
+
+    // Constructor
+    LogStreamInfo(unsigned int uiErrorSev, LogStream *pStream) :
+            m_uiErrorSeverity(uiErrorSev),
+            m_pStream(pStream) {
+        // empty
+    }
+
+    // Destructor
+    ~LogStreamInfo() {
+        delete m_pStream;
+    }
+};
+
+// ----------------------------------------------------------------------------------
+// Construct a default log stream
+LogStream *LogStream::createDefaultStream(aiDefaultLogStream streams,
+        const char *name /*= "AssimpLog.txt"*/,
+        IOSystem *io /*= nullptr*/) {
+    switch (streams) {
+        // This is a platform-specific feature
+    case aiDefaultLogStream_DEBUGGER:
+#ifdef WIN32
+        return new Win32DebugLogStream();
+#else
+        return nullptr;
+#endif
+
+    // Platform-independent default streams
+    case aiDefaultLogStream_STDERR:
+        return new StdOStreamLogStream(std::cerr);
+    case aiDefaultLogStream_STDOUT:
+        return new StdOStreamLogStream(std::cout);
+    case aiDefaultLogStream_FILE:
+        return (name && *name ? new FileLogStream(name, io) : nullptr);
+    default:
+        // We don't know this default log stream, so raise an assertion
+        ai_assert(false);
+    };
+
+    // For compilers without dead code path detection
+    return nullptr;
+}
+
+// ----------------------------------------------------------------------------------
+//  Creates the only singleton instance
+Logger *DefaultLogger::create(const char *name /*= "AssimpLog.txt"*/,
+        LogSeverity severity /*= NORMAL*/,
+        unsigned int defStreams /*= aiDefaultLogStream_DEBUGGER | aiDefaultLogStream_FILE*/,
+        IOSystem *io /*= nullptr*/) {
+    // enter the mutex here to avoid concurrency problems
+#ifndef ASSIMP_BUILD_SINGLETHREADED
+    std::lock_guard<std::mutex> lock(loggerMutex);
+#endif
+
+    if (m_pLogger && !isNullLogger()) {
+        delete m_pLogger;
+    }
+
+    m_pLogger = new DefaultLogger(severity);
+
+    // Attach default log streams
+    // Stream the log to the MSVC debugger?
+    if (defStreams & aiDefaultLogStream_DEBUGGER) {
+        m_pLogger->attachStream(LogStream::createDefaultStream(aiDefaultLogStream_DEBUGGER));
+    }
+
+    // Stream the log to COUT?
+    if (defStreams & aiDefaultLogStream_STDOUT) {
+        m_pLogger->attachStream(LogStream::createDefaultStream(aiDefaultLogStream_STDOUT));
+    }
+
+    // Stream the log to CERR?
+    if (defStreams & aiDefaultLogStream_STDERR) {
+        m_pLogger->attachStream(LogStream::createDefaultStream(aiDefaultLogStream_STDERR));
+    }
+
+    // Stream the log to a file
+    if (defStreams & aiDefaultLogStream_FILE && name && *name) {
+        m_pLogger->attachStream(LogStream::createDefaultStream(aiDefaultLogStream_FILE, name, io));
+    }
+
+    return m_pLogger;
+}
+
+// ----------------------------------------------------------------------------------
+void Logger::debug(const char *message) {
+
+    // SECURITY FIX: otherwise it's easy to produce overruns since
+    // sometimes importers will include data from the input file
+    // (i.e. node names) in their messages.
+    if (strlen(message) > MAX_LOG_MESSAGE_LENGTH) {
+        return OnDebug("<fixme: long message discarded>");
+    }
+    return OnDebug(message);
+}
+
+// ----------------------------------------------------------------------------------
+void Logger::verboseDebug(const char *message) {
+
+    // SECURITY FIX: see above
+    if (strlen(message) > MAX_LOG_MESSAGE_LENGTH) {
+        return OnVerboseDebug("<fixme: long message discarded>");
+    }
+    return OnVerboseDebug(message);
+}
+
+// ----------------------------------------------------------------------------------
+void Logger::info(const char *message) {
+
+    // SECURITY FIX: see above
+    if (strlen(message) > MAX_LOG_MESSAGE_LENGTH) {
+        return OnInfo("<fixme: long message discarded>");
+    }
+    return OnInfo(message);
+}
+
+// ----------------------------------------------------------------------------------
+void Logger::warn(const char *message) {
+
+    // SECURITY FIX: see above
+    if (strlen(message) > MAX_LOG_MESSAGE_LENGTH) {
+        return OnWarn("<fixme: long message discarded>");
+    }
+    return OnWarn(message);
+}
+
+// ----------------------------------------------------------------------------------
+void Logger::error(const char *message) {
+    // SECURITY FIX: see above
+    if (strlen(message) > MAX_LOG_MESSAGE_LENGTH) {
+        return OnError("<fixme: long message discarded>");
+    }
+    return OnError(message);
+}
+
+// ----------------------------------------------------------------------------------
+void DefaultLogger::set(Logger *logger) {
+    // enter the mutex here to avoid concurrency problems
+#ifndef ASSIMP_BUILD_SINGLETHREADED
+    std::lock_guard<std::mutex> lock(loggerMutex);
+#endif
+
+    if (nullptr == logger) {
+        logger = &s_pNullLogger;
+    }
+    if (nullptr != m_pLogger && !isNullLogger()) {
+        delete m_pLogger;
+    }
+
+    DefaultLogger::m_pLogger = logger;
+}
+
+// ----------------------------------------------------------------------------------
+bool DefaultLogger::isNullLogger() {
+    return m_pLogger == &s_pNullLogger;
+}
+
+// ----------------------------------------------------------------------------------
+Logger *DefaultLogger::get() {
+    return m_pLogger;
+}
+
+// ----------------------------------------------------------------------------------
+//  Kills the only instance
+void DefaultLogger::kill() {
+    // enter the mutex here to avoid concurrency problems
+#ifndef ASSIMP_BUILD_SINGLETHREADED
+    std::lock_guard<std::mutex> lock(loggerMutex);
+#endif
+
+    if (m_pLogger == &s_pNullLogger) {
+        return;
+    }
+    delete m_pLogger;
+    m_pLogger = &s_pNullLogger;
+}
+
+// ----------------------------------------------------------------------------------
+//  Debug message
+void DefaultLogger::OnDebug(const char *message) {
+    if (m_Severity < Logger::DEBUGGING) {
+        return;
+    }
+
+    static const size_t Size = MAX_LOG_MESSAGE_LENGTH + 16;
+    char msg[Size];
+    ai_snprintf(msg, Size, "Debug, T%u: %s", GetThreadID(), message);
+
+    WriteToStreams(msg, Logger::Debugging);
+}
+
+//  Verbose debug message
+void DefaultLogger::OnVerboseDebug(const char *message) {
+    if (m_Severity < Logger::VERBOSE) {
+        return;
+    }
+
+    static const size_t Size = MAX_LOG_MESSAGE_LENGTH + 16;
+    char msg[Size];
+    ai_snprintf(msg, Size, "Debug, T%u: %s", GetThreadID(), message);
+
+    WriteToStreams(msg, Logger::Debugging);
+}
+
+// ----------------------------------------------------------------------------------
+//  Logs an info
+void DefaultLogger::OnInfo(const char *message) {
+    static const size_t Size = MAX_LOG_MESSAGE_LENGTH + 16;
+    char msg[Size];
+    ai_snprintf(msg, Size, "Info,  T%u: %s", GetThreadID(), message);
+
+    WriteToStreams(msg, Logger::Info);
+}
+
+// ----------------------------------------------------------------------------------
+//  Logs a warning
+void DefaultLogger::OnWarn(const char *message) {
+    static const size_t Size = MAX_LOG_MESSAGE_LENGTH + 16;
+    char msg[Size];
+    ai_snprintf(msg, Size, "Warn,  T%u: %s", GetThreadID(), message);
+
+    WriteToStreams(msg, Logger::Warn);
+}
+
+// ----------------------------------------------------------------------------------
+//  Logs an error
+void DefaultLogger::OnError(const char *message) {
+    static const size_t Size = MAX_LOG_MESSAGE_LENGTH + 16;
+    char msg[Size];
+    ai_snprintf(msg, Size, "Error, T%u: %s", GetThreadID(), message);
+
+    WriteToStreams(msg, Logger::Err);
+}
+
+// ----------------------------------------------------------------------------------
+//  Will attach a new stream
+bool DefaultLogger::attachStream(LogStream *pStream, unsigned int severity) {
+    if (nullptr == pStream) {
+        return false;
+    }
+
+    if (0 == severity) {
+        severity = Logger::Info | Logger::Err | Logger::Warn | Logger::Debugging;
+    }
+
+    for (StreamIt it = m_StreamArray.begin();
+            it != m_StreamArray.end();
+            ++it) {
+        if ((*it)->m_pStream == pStream) {
+            (*it)->m_uiErrorSeverity |= severity;
+            return true;
+        }
+    }
+
+    LogStreamInfo *pInfo = new LogStreamInfo(severity, pStream);
+    m_StreamArray.push_back(pInfo);
+    return true;
+}
+
+// ----------------------------------------------------------------------------------
+//  Detach a stream
+bool DefaultLogger::detachStream(LogStream *pStream, unsigned int severity) {
+    if (nullptr == pStream) {
+        return false;
+    }
+
+    if (0 == severity) {
+        severity = SeverityAll;
+    }
+
+    bool res(false);
+    for (StreamIt it = m_StreamArray.begin(); it != m_StreamArray.end(); ++it) {
+        if ((*it)->m_pStream == pStream) {
+            (*it)->m_uiErrorSeverity &= ~severity;
+            if ((*it)->m_uiErrorSeverity == 0) {
+                // don't delete the underlying stream 'cause the caller gains ownership again
+                (**it).m_pStream = nullptr;
+                delete *it;
+                m_StreamArray.erase(it);
+                res = true;
+                break;
+            }
+            return true;
+        }
+    }
+    return res;
+}
+
+// ----------------------------------------------------------------------------------
+//  Constructor
+DefaultLogger::DefaultLogger(LogSeverity severity) :
+        Logger(severity), noRepeatMsg(false), lastLen(0) {
+    lastMsg[0] = '\0';
+}
+
+// ----------------------------------------------------------------------------------
+//  Destructor
+DefaultLogger::~DefaultLogger() {
+    for (StreamIt it = m_StreamArray.begin(); it != m_StreamArray.end(); ++it) {
+        // also frees the underlying stream, we are its owner.
+        delete *it;
+    }
+}
+
+// ----------------------------------------------------------------------------------
+//  Writes message to stream
+void DefaultLogger::WriteToStreams(const char *message, ErrorSeverity ErrorSev) {
+    ai_assert(nullptr != message);
+
+    // Check whether this is a repeated message
+    auto thisLen = ::strlen(message);
+    if (thisLen == lastLen - 1 && !::strncmp(message, lastMsg, lastLen - 1)) {
+        if (!noRepeatMsg) {
+            noRepeatMsg = true;
+            message = "Skipping one or more lines with the same contents\n";
+        }
+        return;
+    } else {
+        // append a new-line character to the message to be printed
+        lastLen = thisLen;
+        ::memcpy(lastMsg, message, lastLen + 1);
+        ::strcat(lastMsg + lastLen, "\n");
+
+        message = lastMsg;
+        noRepeatMsg = false;
+        ++lastLen;
+    }
+    for (ConstStreamIt it = m_StreamArray.begin();
+            it != m_StreamArray.end();
+            ++it) {
+        if (ErrorSev & (*it)->m_uiErrorSeverity)
+            (*it)->m_pStream->write(message);
+    }
+}
+
+// ----------------------------------------------------------------------------------
+//  Returns thread id, if not supported only a zero will be returned.
+unsigned int DefaultLogger::GetThreadID() {
+    // fixme: we can get this value via std::threads
+    // std::this_thread::get_id().hash() returns a (big) size_t, not sure if this is useful in this case.
+#ifdef WIN32
+    return (unsigned int)::GetCurrentThreadId();
+#else
+    return 0; // not supported
+#endif
+}
+
+// ----------------------------------------------------------------------------------
+
+} // namespace Assimp