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diff --git a/thirdparty/assimp/code/FBX/FBXModel.cpp b/thirdparty/assimp/code/FBX/FBXModel.cpp
new file mode 100644
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+++ b/thirdparty/assimp/code/FBX/FBXModel.cpp
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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2019, 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  FBXModel.cpp
+ *  @brief Assimp::FBX::Model implementation
+ */
+
+#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER
+
+#include "FBXParser.h"
+#include "FBXMeshGeometry.h"
+#include "FBXDocument.h"
+#include "FBXImporter.h"
+#include "FBXDocumentUtil.h"
+
+namespace Assimp {
+namespace FBX {
+
+using namespace Util;
+
+// ------------------------------------------------------------------------------------------------
+Model::Model(uint64_t id, const Element& element, const Document& doc, const std::string& name)
+    : Object(id,element,name)
+    , shading("Y")
+{
+    const Scope& sc = GetRequiredScope(element);
+    const Element* const Shading = sc["Shading"];
+    const Element* const Culling = sc["Culling"];
+
+    if(Shading) {
+        shading = GetRequiredToken(*Shading,0).StringContents();
+    }
+
+    if (Culling) {
+        culling = ParseTokenAsString(GetRequiredToken(*Culling,0));
+    }
+
+    props = GetPropertyTable(doc,"Model.FbxNode",element,sc);
+    ResolveLinks(element,doc);
+}
+
+// ------------------------------------------------------------------------------------------------
+Model::~Model()
+{
+
+}
+
+// ------------------------------------------------------------------------------------------------
+void Model::ResolveLinks(const Element& element, const Document& doc)
+{
+    const char* const arr[] = {"Geometry","Material","NodeAttribute"};
+
+    // resolve material
+    const std::vector<const Connection*>& conns = doc.GetConnectionsByDestinationSequenced(ID(),arr, 3);
+
+    materials.reserve(conns.size());
+    geometry.reserve(conns.size());
+    attributes.reserve(conns.size());
+    for(const Connection* con : conns) {
+
+        // material and geometry links should be Object-Object connections
+        if (con->PropertyName().length()) {
+            continue;
+        }
+
+        const Object* const ob = con->SourceObject();
+        if(!ob) {
+            DOMWarning("failed to read source object for incoming Model link, ignoring",&element);
+            continue;
+        }
+
+        const Material* const mat = dynamic_cast<const Material*>(ob);
+        if(mat) {
+            materials.push_back(mat);
+            continue;
+        }
+
+        const Geometry* const geo = dynamic_cast<const Geometry*>(ob);
+        if(geo) {
+            geometry.push_back(geo);
+            continue;
+        }
+
+        const NodeAttribute* const att = dynamic_cast<const NodeAttribute*>(ob);
+        if(att) {
+            attributes.push_back(att);
+            continue;
+        }
+
+        DOMWarning("source object for model link is neither Material, NodeAttribute nor Geometry, ignoring",&element);
+        continue;
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+bool Model::IsNull() const
+{
+    const std::vector<const NodeAttribute*>& attrs = GetAttributes();
+    for(const NodeAttribute* att : attrs) {
+
+        const Null* null_tag = dynamic_cast<const Null*>(att);
+        if(null_tag) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+
+} //!FBX
+} //!Assimp
+
+#endif