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diff --git a/src/mesh/assimp-master/code/Common/TargetAnimation.h b/src/mesh/assimp-master/code/Common/TargetAnimation.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 Defines a helper class for the ASE and 3DS loaders to
+ help them compute camera and spot light animation channels */
+#ifndef AI_TARGET_ANIMATION_H_INC
+#define AI_TARGET_ANIMATION_H_INC
+
+#include <assimp/anim.h>
+#include <vector>
+
+namespace Assimp {
+
+// ---------------------------------------------------------------------------
+/** Helper class to iterate through all keys in an animation channel.
+ *
+ *  Missing tracks are interpolated. This is a helper class for
+ *  TargetAnimationHelper, but it can be freely used for other purposes.
+*/
+class KeyIterator {
+public:
+    // ------------------------------------------------------------------
+    /** Constructs a new key iterator
+     *
+     *  @param _objPos Object position track. May be nullptr.
+     *  @param _targetObjPos Target object position track. May be nullptr.
+     *  @param defaultObjectPos Default object position to be used if
+     *    no animated track is available. May be nullptr.
+     *  @param defaultTargetPos Default target position to be used if
+     *    no animated track is available. May be nullptr.
+     */
+    KeyIterator(const std::vector<aiVectorKey> *_objPos,
+            const std::vector<aiVectorKey> *_targetObjPos,
+            const aiVector3D *defaultObjectPos = nullptr,
+            const aiVector3D *defaultTargetPos = nullptr);
+
+    // ------------------------------------------------------------------
+    /** Returns true if all keys have been processed
+     */
+    bool Finished() const { return reachedEnd; }
+
+    // ------------------------------------------------------------------
+    /** Increment the iterator
+     */
+    void operator++();
+    inline void operator++(int) { return ++(*this); }
+
+    // ------------------------------------------------------------------
+    /** Getters to retrieve the current state of the iterator
+     */
+    inline const aiVector3D &GetCurPosition() const { return curPosition; }
+
+    inline const aiVector3D &GetCurTargetPosition() const { return curTargetPosition; }
+
+    inline double GetCurTime() const { return curTime; }
+
+private:
+    //! Did we reach the end?
+    bool reachedEnd;
+
+    //! Represents the current position of the iterator
+    aiVector3D curPosition, curTargetPosition;
+
+    double curTime;
+
+    //! Input tracks and the next key to process
+    const std::vector<aiVectorKey> *objPos, *targetObjPos;
+
+    unsigned int nextObjPos, nextTargetObjPos;
+    std::vector<aiVectorKey> defaultObjPos, defaultTargetObjPos;
+};
+
+// ---------------------------------------------------------------------------
+/** Helper class for the 3DS and ASE loaders to compute camera and spot light
+ *  animations.
+ *
+ * 3DS and ASE store the differently to Assimp - there is an animation
+ * channel for the camera/spot light itself and a separate position
+ * animation channels specifying the position of the camera/spot light
+ * look-at target */
+class TargetAnimationHelper {
+public:
+    TargetAnimationHelper() :
+            targetPositions(nullptr),
+            objectPositions(nullptr) {
+        // empty
+    }
+
+    // ------------------------------------------------------------------
+    /** Sets the target animation channel
+     *
+     *  This channel specifies the position of the camera/spot light
+     *  target at a specific position.
+     *
+     *  @param targetPositions Translation channel*/
+    void SetTargetAnimationChannel(const std::vector<aiVectorKey> *targetPositions);
+
+    // ------------------------------------------------------------------
+    /** Sets the main animation channel
+     *
+     *  @param objectPositions Translation channel */
+    void SetMainAnimationChannel(const std::vector<aiVectorKey> *objectPositions);
+
+    // ------------------------------------------------------------------
+    /** Sets the main animation channel to a fixed value
+     *
+     *  @param fixed Fixed value for the main animation channel*/
+    void SetFixedMainAnimationChannel(const aiVector3D &fixed);
+
+    // ------------------------------------------------------------------
+    /** Computes final animation channels
+     * @param distanceTrack Receive camera translation keys ... != nullptr. */
+    void Process(std::vector<aiVectorKey> *distanceTrack);
+
+private:
+    const std::vector<aiVectorKey> *targetPositions, *objectPositions;
+    aiVector3D fixedMain;
+};
+
+} // namespace Assimp
+
+#endif // include guard