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diff --git a/src/mesh/assimp-master/code/AssetLib/Collada/ColladaHelper.cpp b/src/mesh/assimp-master/code/AssetLib/Collada/ColladaHelper.cpp
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+++ b/src/mesh/assimp-master/code/AssetLib/Collada/ColladaHelper.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.
+
+----------------------------------------------------------------------
+*/
+/** Helper structures for the Collada loader */
+
+#include "ColladaHelper.h"
+
+#include <assimp/ParsingUtils.h>
+#include <assimp/commonMetaData.h>
+
+namespace Assimp {
+namespace Collada {
+
+const MetaKeyPairVector MakeColladaAssimpMetaKeys() {
+    MetaKeyPairVector result;
+    result.emplace_back("authoring_tool", AI_METADATA_SOURCE_GENERATOR);
+    result.emplace_back("copyright", AI_METADATA_SOURCE_COPYRIGHT);
+    return result;
+}
+
+const MetaKeyPairVector &GetColladaAssimpMetaKeys() {
+    static const MetaKeyPairVector result = MakeColladaAssimpMetaKeys();
+    return result;
+}
+
+const MetaKeyPairVector MakeColladaAssimpMetaKeysCamelCase() {
+    MetaKeyPairVector result = MakeColladaAssimpMetaKeys();
+    for (auto &val : result) {
+        ToCamelCase(val.first);
+    }
+    return result;
+}
+
+const MetaKeyPairVector &GetColladaAssimpMetaKeysCamelCase() {
+    static const MetaKeyPairVector result = MakeColladaAssimpMetaKeysCamelCase();
+    return result;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Convert underscore_separated to CamelCase: "authoring_tool" becomes "AuthoringTool"
+void ToCamelCase(std::string &text) {
+    if (text.empty())
+        return;
+    // Capitalise first character
+    auto it = text.begin();
+    (*it) = ai_toupper(*it);
+    ++it;
+    for (/*started above*/; it != text.end(); /*iterated below*/) {
+        if ((*it) == '_') {
+            it = text.erase(it);
+            if (it != text.end())
+                (*it) = ai_toupper(*it);
+        } else {
+            // Make lower case
+            (*it) = ai_tolower(*it);
+            ++it;
+        }
+    }
+}
+
+} // namespace Collada
+} // namespace Assimp