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diff --git a/src/3rdparty/assimp/include/assimp/quaternion.h b/src/3rdparty/assimp/include/assimp/quaternion.h
deleted file mode 100644
index a5cb67a9a..000000000
--- a/src/3rdparty/assimp/include/assimp/quaternion.h
+++ /dev/null
@@ -1,129 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2017, 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 quaternion.h
- *  @brief Quaternion structure, including operators when compiling in C++
- */
-#pragma once
-#ifndef AI_QUATERNION_H_INC
-#define AI_QUATERNION_H_INC
-
-#ifdef __cplusplus
-
-#include "defs.h"
-
-template <typename TReal> class aiVector3t;
-template <typename TReal> class aiMatrix3x3t;
-
-// ---------------------------------------------------------------------------
-/** Represents a quaternion in a 4D vector. */
-template <typename TReal>
-class aiQuaterniont
-{
-public:
-    aiQuaterniont() : w(1.0), x(), y(), z() {}
-    aiQuaterniont(TReal pw, TReal px, TReal py, TReal pz)
-        : w(pw), x(px), y(py), z(pz) {}
-
-    /** Construct from rotation matrix. Result is undefined if the matrix is not orthonormal. */
-    explicit aiQuaterniont( const aiMatrix3x3t<TReal>& pRotMatrix);
-
-    /** Construct from euler angles */
-    aiQuaterniont( TReal rotx, TReal roty, TReal rotz);
-
-    /** Construct from an axis-angle pair */
-    aiQuaterniont( aiVector3t<TReal> axis, TReal angle);
-
-    /** Construct from a normalized quaternion stored in a vec3 */
-    explicit aiQuaterniont( aiVector3t<TReal> normalized);
-
-    /** Returns a matrix representation of the quaternion */
-    aiMatrix3x3t<TReal> GetMatrix() const;
-
-public:
-
-    bool operator== (const aiQuaterniont& o) const;
-    bool operator!= (const aiQuaterniont& o) const;
-
-    bool Equal(const aiQuaterniont& o, TReal epsilon = 1e-6) const;
-
-public:
-
-    /** Normalize the quaternion */
-    aiQuaterniont& Normalize();
-
-    /** Compute quaternion conjugate */
-    aiQuaterniont& Conjugate ();
-
-    /** Rotate a point by this quaternion */
-    aiVector3t<TReal> Rotate (const aiVector3t<TReal>& in);
-
-    /** Multiply two quaternions */
-    aiQuaterniont operator* (const aiQuaterniont& two) const;
-
-public:
-
-    /** Performs a spherical interpolation between two quaternions and writes the result into the third.
-     * @param pOut Target object to received the interpolated rotation.
-     * @param pStart Start rotation of the interpolation at factor == 0.
-     * @param pEnd End rotation, factor == 1.
-     * @param pFactor Interpolation factor between 0 and 1. Values outside of this range yield undefined results.
-     */
-    static void Interpolate( aiQuaterniont& pOut, const aiQuaterniont& pStart,
-        const aiQuaterniont& pEnd, TReal pFactor);
-
-public:
-
-    //! w,x,y,z components of the quaternion
-    TReal w, x, y, z;
-} ;
-
-typedef aiQuaterniont<ai_real> aiQuaternion;
-
-#else
-
-struct aiQuaternion {
-    ai_real w, x, y, z;
-};
-
-#endif
-
-#endif // AI_QUATERNION_H_INC