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diff --git a/libs/assimp/code/AssetLib/FBX/FBXDocumentUtil.h b/libs/assimp/code/AssetLib/FBX/FBXDocumentUtil.h
new file mode 100644
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+++ b/libs/assimp/code/AssetLib/FBX/FBXDocumentUtil.h
@@ -0,0 +1,120 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2020, 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  FBXDocumentUtil.h
+ *  @brief FBX internal utilities used by the DOM reading code
+ */
+#ifndef INCLUDED_AI_FBX_DOCUMENT_UTIL_H
+#define INCLUDED_AI_FBX_DOCUMENT_UTIL_H
+
+#include <assimp/defs.h>
+#include <string>
+#include <memory>
+#include "FBXDocument.h"
+
+struct Token;
+struct Element;
+
+namespace Assimp {
+namespace FBX {
+namespace Util {
+
+/* DOM/Parse error reporting - does not return */
+AI_WONT_RETURN void DOMError(const std::string& message, const Token& token) AI_WONT_RETURN_SUFFIX;
+AI_WONT_RETURN void DOMError(const std::string& message, const Element* element = NULL) AI_WONT_RETURN_SUFFIX;
+
+// does return
+void DOMWarning(const std::string& message, const Token& token);
+void DOMWarning(const std::string& message, const Element* element = NULL);
+
+
+// fetch a property table and the corresponding property template
+std::shared_ptr<const PropertyTable> GetPropertyTable(const Document& doc,
+    const std::string& templateName,
+    const Element &element,
+    const Scope& sc,
+    bool no_warn = false);
+
+// ------------------------------------------------------------------------------------------------
+template <typename T>
+inline
+const T* ProcessSimpleConnection(const Connection& con,
+    bool is_object_property_conn,
+    const char* name,
+    const Element& element,
+    const char** propNameOut = nullptr)
+{
+    if (is_object_property_conn && !con.PropertyName().length()) {
+        DOMWarning("expected incoming " + std::string(name) +
+            " link to be an object-object connection, ignoring",
+            &element
+            );
+        return nullptr;
+    }
+    else if (!is_object_property_conn && con.PropertyName().length()) {
+        DOMWarning("expected incoming " + std::string(name) +
+            " link to be an object-property connection, ignoring",
+            &element
+            );
+        return nullptr;
+    }
+
+    if(is_object_property_conn && propNameOut) {
+        // note: this is ok, the return value of PropertyValue() is guaranteed to
+        // remain valid and unchanged as long as the document exists.
+        *propNameOut = con.PropertyName().c_str();
+    }
+
+    const Object* const ob = con.SourceObject();
+    if(!ob) {
+        DOMWarning("failed to read source object for incoming " + std::string(name) +
+            " link, ignoring",
+            &element);
+        return nullptr;
+    }
+
+    return dynamic_cast<const T*>(ob);
+}
+
+} //!Util
+} //!FBX
+} //!Assimp
+
+#endif