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diff --git a/src/mesh/assimp-master/test/unit/utJoinVertices.cpp b/src/mesh/assimp-master/test/unit/utJoinVertices.cpp
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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.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include <assimp/scene.h>
+
+#include "PostProcessing/JoinVerticesProcess.h"
+
+using namespace std;
+using namespace Assimp;
+
+class utJoinVertices : public ::testing::Test {
+public:
+    utJoinVertices() :
+            Test(), piProcess(nullptr), pcMesh(nullptr) {
+        // empty
+    }
+
+protected:
+    virtual void SetUp();
+    virtual void TearDown();
+
+protected:
+    JoinVerticesProcess *piProcess;
+    aiMesh *pcMesh;
+};
+
+// ------------------------------------------------------------------------------------------------
+void utJoinVertices::SetUp() {
+    // construct the process
+    piProcess = new JoinVerticesProcess();
+
+    // create a quite small mesh for testing purposes -
+    // the mesh itself is *something* but it has redundant vertices
+    pcMesh = new aiMesh();
+
+    pcMesh->mNumVertices = 900;
+    aiVector3D *&pv = pcMesh->mVertices = new aiVector3D[900];
+    for (unsigned int i = 0; i < 3; ++i) {
+        const unsigned int base = i * 300;
+        for (unsigned int a = 0; a < 300; ++a) {
+            pv[base + a].x = pv[base + a].y = pv[base + a].z = (float)a;
+        }
+    }
+
+    // generate faces - each vertex is referenced once
+    pcMesh->mNumFaces = 300;
+    pcMesh->mFaces = new aiFace[300];
+    for (unsigned int i = 0, p = 0; i < 300; ++i) {
+        aiFace &face = pcMesh->mFaces[i];
+        face.mIndices = new unsigned int[face.mNumIndices = 3];
+        for (unsigned int a = 0; a < 3; ++a) {
+            face.mIndices[a] = p++;
+        }
+    }
+
+    // generate extra members - set them to zero to make sure they're identical
+    pcMesh->mTextureCoords[0] = new aiVector3D[900];
+    pcMesh->mBitangents = new aiVector3D[900];
+    pcMesh->mNormals = new aiVector3D[900];
+    pcMesh->mTangents = new aiVector3D[900];
+    for (unsigned int i = 0; i < 900; ++i) {
+        pcMesh->mTextureCoords[0][i] = aiVector3D(0.f);
+        pcMesh->mNormals[i] = aiVector3D(0.f);
+        pcMesh->mTangents[i] = aiVector3D(0.f);
+        pcMesh->mBitangents[i] = aiVector3D(0.f);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void utJoinVertices::TearDown() {
+    delete this->pcMesh;
+    pcMesh = nullptr;
+    delete this->piProcess;
+    piProcess = nullptr;
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(utJoinVertices, testProcess) {
+    // execute the step on the given data
+    piProcess->ProcessMesh(pcMesh, 0);
+
+    // the number of faces shouldn't change
+    ASSERT_EQ(300U, pcMesh->mNumFaces);
+    ASSERT_EQ(300U, pcMesh->mNumVertices);
+
+    ASSERT_TRUE(nullptr != pcMesh->mNormals);
+    ASSERT_TRUE(nullptr != pcMesh->mTangents);
+    ASSERT_TRUE(nullptr != pcMesh->mBitangents);
+    ASSERT_TRUE(nullptr != pcMesh->mTextureCoords[0]);
+
+    // the order doesn't care
+    float fSum = 0.f;
+    for (unsigned int i = 0; i < 300; ++i) {
+        aiVector3D &v = pcMesh->mVertices[i];
+        fSum += v.x + v.y + v.z;
+
+        EXPECT_FALSE(pcMesh->mNormals[i].x);
+        EXPECT_FALSE(pcMesh->mTangents[i].x);
+        EXPECT_FALSE(pcMesh->mBitangents[i].x);
+        EXPECT_FALSE(pcMesh->mTextureCoords[0][i].x);
+    }
+    EXPECT_EQ(150.f * 299.f * 3.f, fSum); // gaussian sum equation
+}