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diff --git a/src/mesh/assimp-master/code/Common/DefaultIOSystem.cpp b/src/mesh/assimp-master/code/Common/DefaultIOSystem.cpp
new file mode 100644
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+++ b/src/mesh/assimp-master/code/Common/DefaultIOSystem.cpp
@@ -0,0 +1,223 @@
+/*
+---------------------------------------------------------------------------
+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 Default implementation of IOSystem using the standard C file functions */
+
+#include <assimp/StringComparison.h>
+
+#include <assimp/DefaultIOStream.h>
+#include <assimp/DefaultIOSystem.h>
+#include <assimp/ai_assert.h>
+#include <stdlib.h>
+#include <assimp/DefaultLogger.hpp>
+
+#ifdef __unix__
+#    include <stdlib.h>
+#    include <sys/param.h>
+#endif
+
+#ifdef _WIN32
+#    include <windows.h>
+#endif
+
+using namespace Assimp;
+
+#ifdef _WIN32
+
+const std::wstring wdummy;
+
+static std::wstring Utf8ToWide(const char *in) {
+    if (nullptr == in) {
+        return wdummy;
+    }
+    int size = MultiByteToWideChar(CP_UTF8, 0, in, -1, nullptr, 0);
+    // size includes terminating null; std::wstring adds null automatically
+    std::wstring out(static_cast<size_t>(size) - 1, L'\0');
+    MultiByteToWideChar(CP_UTF8, 0, in, -1, &out[0], size);
+
+    return out;
+}
+
+const std::string dummy;
+
+static std::string WideToUtf8(const wchar_t *in) {
+    if (nullptr == in) {
+        return dummy;
+    }
+    int size = WideCharToMultiByte(CP_UTF8, 0, in, -1, nullptr, 0, nullptr, nullptr);
+    // size includes terminating null; std::string adds null automatically
+    std::string out(static_cast<size_t>(size) - 1, '\0');
+    WideCharToMultiByte(CP_UTF8, 0, in, -1, &out[0], size, nullptr, nullptr);
+
+    return out;
+}
+#endif
+
+// ------------------------------------------------------------------------------------------------
+// Tests for the existence of a file at the given path.
+bool DefaultIOSystem::Exists(const char *pFile) const {
+#ifdef _WIN32
+    struct __stat64 filestat;
+    if (_wstat64(Utf8ToWide(pFile).c_str(), &filestat) != 0) {
+        return false;
+    }
+#else
+    FILE *file = ::fopen(pFile, "rb");
+    if (!file) {
+        return false;
+    }
+
+    ::fclose(file);
+#endif
+
+    return true;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Open a new file with a given path.
+IOStream *DefaultIOSystem::Open(const char *strFile, const char *strMode) {
+    ai_assert(strFile != nullptr);
+    ai_assert(strMode != nullptr);
+    FILE *file;
+#ifdef _WIN32
+    std::wstring name = Utf8ToWide(strFile);
+    if (name.empty()) {
+        return nullptr;
+    }
+
+    file = ::_wfopen(name.c_str(), Utf8ToWide(strMode).c_str());
+#else
+    file = ::fopen(strFile, strMode);
+#endif
+    if (!file) {
+        return nullptr;
+    }
+
+    return new DefaultIOStream(file, strFile);
+}
+
+// ------------------------------------------------------------------------------------------------
+// Closes the given file and releases all resources associated with it.
+void DefaultIOSystem::Close(IOStream *pFile) {
+    delete pFile;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Returns the operation specific directory separator
+char DefaultIOSystem::getOsSeparator() const {
+#ifndef _WIN32
+    return '/';
+#else
+    return '\\';
+#endif
+}
+
+// ------------------------------------------------------------------------------------------------
+// IOSystem default implementation (ComparePaths isn't a pure virtual function)
+bool IOSystem::ComparePaths(const char *one, const char *second) const {
+    return !ASSIMP_stricmp(one, second);
+}
+
+// ------------------------------------------------------------------------------------------------
+// Convert a relative path into an absolute path
+inline static std::string MakeAbsolutePath(const char *in) {
+    ai_assert(in);
+    std::string out;
+#ifdef _WIN32
+    wchar_t *ret = ::_wfullpath(nullptr, Utf8ToWide(in).c_str(), 0);
+    if (ret) {
+        out = WideToUtf8(ret);
+        free(ret);
+    }
+#else
+    char *ret = realpath(in, nullptr);
+    if (ret) {
+        out = ret;
+        free(ret);
+    }
+#endif
+    else {
+        // preserve the input path, maybe someone else is able to fix
+        // the path before it is accessed (e.g. our file system filter)
+        ASSIMP_LOG_WARN("Invalid path: ", std::string(in));
+        out = in;
+    }
+    return out;
+}
+
+// ------------------------------------------------------------------------------------------------
+// DefaultIOSystem's more specialized implementation
+bool DefaultIOSystem::ComparePaths(const char *one, const char *second) const {
+    // chances are quite good both paths are formatted identically,
+    // so we can hopefully return here already
+    if (!ASSIMP_stricmp(one, second))
+        return true;
+
+    std::string temp1 = MakeAbsolutePath(one);
+    std::string temp2 = MakeAbsolutePath(second);
+
+    return !ASSIMP_stricmp(temp1, temp2);
+}
+
+// ------------------------------------------------------------------------------------------------
+std::string DefaultIOSystem::fileName(const std::string &path) {
+    std::string ret = path;
+    std::size_t last = ret.find_last_of("\\/");
+    if (last != std::string::npos) ret = ret.substr(last + 1);
+    return ret;
+}
+
+// ------------------------------------------------------------------------------------------------
+std::string DefaultIOSystem::completeBaseName(const std::string &path) {
+    std::string ret = fileName(path);
+    std::size_t pos = ret.find_last_of('.');
+    if (pos != std::string::npos) ret = ret.substr(0, pos);
+    return ret;
+}
+
+// ------------------------------------------------------------------------------------------------
+std::string DefaultIOSystem::absolutePath(const std::string &path) {
+    std::string ret = path;
+    std::size_t last = ret.find_last_of("\\/");
+    if (last != std::string::npos) ret = ret.substr(0, last);
+    return ret;
+}
+
+// ------------------------------------------------------------------------------------------------