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diff --git a/src/mesh/assimp-master/code/AssetLib/Blender/BlenderModifier.h b/src/mesh/assimp-master/code/AssetLib/Blender/BlenderModifier.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  BlenderModifier.h
+ *  @brief Declare dedicated helper classes to simulate some blender modifiers (i.e. mirror)
+ */
+#ifndef INCLUDED_AI_BLEND_MODIFIER_H
+#define INCLUDED_AI_BLEND_MODIFIER_H
+
+#include "BlenderIntermediate.h"
+
+namespace Assimp {
+namespace Blender {
+
+// -------------------------------------------------------------------------------------------
+/**
+ *  Dummy base class for all blender modifiers. Modifiers are reused between imports, so
+ *  they should be stateless and not try to cache model data.
+ */
+// -------------------------------------------------------------------------------------------
+class BlenderModifier {
+public:
+    /**
+     *  The class destructor, virtual.
+     */
+    virtual ~BlenderModifier() {
+        // empty
+    }
+
+    // --------------------
+    /**
+     *  Check if *this* modifier is active, given a ModifierData& block.
+     */
+    virtual bool IsActive( const ModifierData& /*modin*/) {
+        return false;
+    }
+
+    // --------------------
+    /**
+     *  Apply the modifier to a given output node. The original data used
+     *  to construct the node is given as well. Not called unless IsActive()
+     *  was called and gave positive response.
+     */
+    virtual void DoIt(aiNode& /*out*/,
+        ConversionData& /*conv_data*/,
+        const ElemBase& orig_modifier,
+        const Scene& /*in*/,
+        const Object& /*orig_object*/
+    ) {
+        ASSIMP_LOG_INFO("This modifier is not supported, skipping: ",orig_modifier.dna_type );
+        return;
+    }
+};
+
+// -------------------------------------------------------------------------------------------
+/**
+ *  Manage all known modifiers and instance and apply them if necessary
+ */
+// -------------------------------------------------------------------------------------------
+class BlenderModifierShowcase {
+public:
+    // --------------------
+    /** Apply all requested modifiers provided we support them. */
+    void ApplyModifiers(aiNode& out,
+        ConversionData& conv_data,
+        const Scene& in,
+        const Object& orig_object
+    );
+
+private:
+    TempArray< std::vector,BlenderModifier > cached_modifiers;
+};
+
+// MODIFIERS /////////////////////////////////////////////////////////////////////////////////
+
+// -------------------------------------------------------------------------------------------
+/**
+ *  Mirror modifier. Status: implemented.
+ */
+// -------------------------------------------------------------------------------------------
+class BlenderModifier_Mirror : public BlenderModifier {
+public:
+    // --------------------
+    virtual bool IsActive( const ModifierData& modin);
+
+    // --------------------
+    virtual void DoIt(aiNode& out,
+        ConversionData& conv_data,
+        const ElemBase& orig_modifier,
+        const Scene& in,
+        const Object& orig_object
+    ) ;
+};
+
+// -------------------------------------------------------------------------------------------
+/** Subdivision modifier. Status: dummy. */
+// -------------------------------------------------------------------------------------------
+class BlenderModifier_Subdivision : public BlenderModifier {
+public:
+
+    // --------------------
+    virtual bool IsActive( const ModifierData& modin);
+
+    // --------------------
+    virtual void DoIt(aiNode& out,
+        ConversionData& conv_data,
+        const ElemBase& orig_modifier,
+        const Scene& in,
+        const Object& orig_object
+    ) ;
+};
+
+}
+}
+
+#endif // !INCLUDED_AI_BLEND_MODIFIER_H