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diff --git a/src/mesh/assimp-master/code/AssetLib/FBX/FBXProperties.h b/src/mesh/assimp-master/code/AssetLib/FBX/FBXProperties.h
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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  FBXProperties.h
+ *  @brief FBX dynamic properties
+ */
+#ifndef INCLUDED_AI_FBX_PROPERTIES_H
+#define INCLUDED_AI_FBX_PROPERTIES_H
+
+#include "FBXCompileConfig.h"
+#include <memory>
+#include <string>
+
+namespace Assimp {
+namespace FBX {
+
+// Forward declarations
+class Element;
+
+/** Represents a dynamic property. Type info added by deriving classes,
+ *  see #TypedProperty.
+ Example:
+ @verbatim
+   P: "ShininessExponent", "double", "Number", "",0.5
+ @endvebatim
+*/
+class Property {
+protected:
+    Property();
+
+public:
+    virtual ~Property();
+
+public:
+    template <typename T>
+    const T* As() const {
+        return dynamic_cast<const T*>(this);
+    }
+};
+
+template<typename T>
+class TypedProperty : public Property {
+public:
+    explicit TypedProperty(const T& value)
+    : value(value) {
+        // empty
+    }
+
+    const T& Value() const {
+        return value;
+    }
+
+private:
+    T value;
+};
+
+
+typedef std::fbx_unordered_map<std::string,std::shared_ptr<Property> > DirectPropertyMap;
+typedef std::fbx_unordered_map<std::string,const Property*>            PropertyMap;
+typedef std::fbx_unordered_map<std::string,const Element*>             LazyPropertyMap;
+
+/**
+ *  Represents a property table as can be found in the newer FBX files (Properties60, Properties70)
+ */
+class PropertyTable {
+public:
+    // in-memory property table with no source element
+    PropertyTable();
+    PropertyTable(const Element& element, std::shared_ptr<const PropertyTable> templateProps);
+    ~PropertyTable();
+
+    const Property* Get(const std::string& name) const;
+
+    // PropertyTable's need not be coupled with FBX elements so this can be nullptr
+    const Element* GetElement() const {
+        return element;
+    }
+
+    const PropertyTable* TemplateProps() const {
+        return templateProps.get();
+    }
+
+    DirectPropertyMap GetUnparsedProperties() const;
+
+private:
+    LazyPropertyMap lazyProps;
+    mutable PropertyMap props;
+    const std::shared_ptr<const PropertyTable> templateProps;
+    const Element* const element;
+};
+
+// ------------------------------------------------------------------------------------------------
+template <typename T>
+inline
+T PropertyGet(const PropertyTable& in, const std::string& name, const T& defaultValue) {
+    const Property* const prop = in.Get(name);
+    if( nullptr == prop) {
+        return defaultValue;
+    }
+
+    // strong typing, no need to be lenient
+    const TypedProperty<T>* const tprop = prop->As< TypedProperty<T> >();
+    if( nullptr == tprop) {
+        return defaultValue;
+    }
+
+    return tprop->Value();
+}
+
+// ------------------------------------------------------------------------------------------------
+template <typename T>
+inline
+T PropertyGet(const PropertyTable& in, const std::string& name, bool& result, bool useTemplate=false ) {
+    const Property* prop = in.Get(name);
+    if( nullptr == prop) {
+        if ( ! useTemplate ) {
+            result = false;
+            return T();
+        }
+        const PropertyTable* templ = in.TemplateProps();
+        if ( nullptr == templ ) {
+            result = false;
+            return T();
+        }
+        prop = templ->Get(name);
+        if ( nullptr == prop ) {
+            result = false;
+            return T();
+        }
+    }
+
+    // strong typing, no need to be lenient
+    const TypedProperty<T>* const tprop = prop->As< TypedProperty<T> >();
+    if( nullptr == tprop) {
+        result = false;
+        return T();
+    }
+
+    result = true;
+    return tprop->Value();
+}
+
+} //! FBX
+} //! Assimp
+
+#endif // INCLUDED_AI_FBX_PROPERTIES_H