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diff --git a/thirdparty/assimp/code/BaseProcess.cpp b/thirdparty/assimp/code/BaseProcess.cpp
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+++ b/thirdparty/assimp/code/BaseProcess.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 Implementation of BaseProcess */
+
+#include <assimp/BaseImporter.h>
+#include "BaseProcess.h"
+#include <assimp/DefaultLogger.hpp>
+#include <assimp/scene.h>
+#include "Importer.h"
+
+using namespace Assimp;
+
+// ------------------------------------------------------------------------------------------------
+// Constructor to be privately used by Importer
+BaseProcess::BaseProcess() AI_NO_EXCEPT
+: shared()
+, progress()
+{
+}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+BaseProcess::~BaseProcess()
+{
+    // nothing to do here
+}
+
+// ------------------------------------------------------------------------------------------------
+void BaseProcess::ExecuteOnScene( Importer* pImp)
+{
+    ai_assert(NULL != pImp && NULL != pImp->Pimpl()->mScene);
+
+    progress = pImp->GetProgressHandler();
+    ai_assert(progress);
+
+    SetupProperties( pImp );
+
+    // catch exceptions thrown inside the PostProcess-Step
+    try
+    {
+        Execute(pImp->Pimpl()->mScene);
+
+    } catch( const std::exception& err )    {
+
+        // extract error description
+        pImp->Pimpl()->mErrorString = err.what();
+        ASSIMP_LOG_ERROR(pImp->Pimpl()->mErrorString);
+
+        // and kill the partially imported data
+        delete pImp->Pimpl()->mScene;
+        pImp->Pimpl()->mScene = NULL;
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void BaseProcess::SetupProperties(const Importer* /*pImp*/)
+{
+    // the default implementation does nothing
+}
+
+// ------------------------------------------------------------------------------------------------
+bool BaseProcess::RequireVerboseFormat() const
+{
+    return true;
+}
+