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diff --git a/libs/assimp/test/unit/utFindDegenerates.cpp b/libs/assimp/test/unit/utFindDegenerates.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 "../../include/assimp/scene.h"
+#include "PostProcessing/FindDegenerates.h"
+
+#include <memory>
+
+using namespace std;
+using namespace Assimp;
+
+class FindDegeneratesProcessTest : public ::testing::Test {
+public:
+    FindDegeneratesProcessTest() :
+            Test(), mMesh(nullptr), mProcess(nullptr) {
+        // empty
+    }
+
+protected:
+    virtual void SetUp();
+    virtual void TearDown();
+
+protected:
+    aiMesh *mMesh;
+    FindDegeneratesProcess *mProcess;
+};
+
+void FindDegeneratesProcessTest::SetUp() {
+    mMesh = new aiMesh();
+    mProcess = new FindDegeneratesProcess();
+
+    mMesh->mNumFaces = 1000;
+    mMesh->mFaces = new aiFace[1000];
+
+    mMesh->mNumVertices = 5000 * 2;
+    mMesh->mVertices = new aiVector3D[5000 * 2];
+
+    for (unsigned int i = 0; i < 5000; ++i) {
+        mMesh->mVertices[i] = mMesh->mVertices[i + 5000] = aiVector3D((float)i);
+    }
+
+    mMesh->mPrimitiveTypes = aiPrimitiveType_LINE | aiPrimitiveType_POINT |
+                             aiPrimitiveType_POLYGON | aiPrimitiveType_TRIANGLE;
+
+    unsigned int numOut = 0, numFaces = 0;
+    for (unsigned int i = 0; i < 1000; ++i) {
+        aiFace &f = mMesh->mFaces[i];
+        f.mNumIndices = (i % 5) + 1; // between 1 and 5
+        f.mIndices = new unsigned int[f.mNumIndices];
+        bool had = false;
+        for (unsigned int n = 0; n < f.mNumIndices; ++n) {
+            // FIXME
+#if 0
+        // some duplicate indices
+        if ( n && n == (i / 200)+1) {
+            f.mIndices[n] = f.mIndices[n-1];
+            had = true;
+        }
+        // and some duplicate vertices
+#endif
+            if (n && i % 2 && 0 == n % 2) {
+                f.mIndices[n] = f.mIndices[n - 1] + 5000;
+                had = true;
+            } else {
+                f.mIndices[n] = numOut++;
+            }
+        }
+        if (!had)
+            ++numFaces;
+    }
+    mMesh->mNumUVComponents[0] = numOut;
+    mMesh->mNumUVComponents[1] = numFaces;
+}
+
+void FindDegeneratesProcessTest::TearDown() {
+    delete mMesh;
+    delete mProcess;
+}
+
+TEST_F(FindDegeneratesProcessTest, testDegeneratesDetection) {
+    mProcess->EnableInstantRemoval(false);
+    mProcess->ExecuteOnMesh(mMesh);
+
+    unsigned int out = 0;
+    for (unsigned int i = 0; i < 1000; ++i) {
+        aiFace &f = mMesh->mFaces[i];
+        out += f.mNumIndices;
+    }
+
+    EXPECT_EQ(1000U, mMesh->mNumFaces);
+    EXPECT_EQ(10000U, mMesh->mNumVertices);
+    EXPECT_EQ(out, mMesh->mNumUVComponents[0]);
+    EXPECT_EQ(static_cast<unsigned int>(
+                      aiPrimitiveType_LINE | aiPrimitiveType_POINT |
+                      aiPrimitiveType_POLYGON | aiPrimitiveType_TRIANGLE),
+            mMesh->mPrimitiveTypes);
+}
+
+TEST_F(FindDegeneratesProcessTest, testDegeneratesRemoval) {
+    mProcess->EnableAreaCheck(false);
+    mProcess->EnableInstantRemoval(true);
+    mProcess->ExecuteOnMesh(mMesh);
+
+    EXPECT_EQ(mMesh->mNumUVComponents[1], mMesh->mNumFaces);
+}
+
+TEST_F(FindDegeneratesProcessTest, testDegeneratesRemovalWithAreaCheck) {
+    mProcess->EnableAreaCheck(true);
+    mProcess->EnableInstantRemoval(true);
+    mProcess->ExecuteOnMesh(mMesh);
+
+    EXPECT_EQ(mMesh->mNumUVComponents[1] - 100, mMesh->mNumFaces);
+}
+
+namespace
+{
+    std::unique_ptr<aiMesh> getDegenerateMesh()
+    {
+        std::unique_ptr<aiMesh> mesh(new aiMesh);
+        mesh->mNumVertices = 2;
+        mesh->mVertices = new aiVector3D[2];
+        mesh->mVertices[0] = aiVector3D{ 0.0f, 0.0f, 0.0f };
+        mesh->mVertices[1] = aiVector3D{ 1.0f, 0.0f, 0.0f };
+        mesh->mNumFaces = 1;
+        mesh->mFaces = new aiFace[1];
+        mesh->mFaces[0].mNumIndices = 3;
+        mesh->mFaces[0].mIndices = new unsigned int[3];
+        mesh->mFaces[0].mIndices[0] = 0;
+        mesh->mFaces[0].mIndices[1] = 1;
+        mesh->mFaces[0].mIndices[2] = 0;
+        return mesh;
+    }
+}
+
+TEST_F(FindDegeneratesProcessTest, meshRemoval) {
+    mProcess->EnableAreaCheck(true);
+    mProcess->EnableInstantRemoval(true);
+    mProcess->ExecuteOnMesh(mMesh);
+
+    std::unique_ptr<aiScene> scene(new aiScene);
+    scene->mNumMeshes = 5;
+    scene->mMeshes = new aiMesh*[5];
+
+    /// Use the mesh which doesn't get completely stripped of faces from the main test.
+    aiMesh* meshWhichSurvives = mMesh;
+    mMesh = nullptr;
+
+    scene->mMeshes[0] = getDegenerateMesh().release();
+    scene->mMeshes[1] = getDegenerateMesh().release();
+    scene->mMeshes[2] = meshWhichSurvives;
+    scene->mMeshes[3] = getDegenerateMesh().release();
+    scene->mMeshes[4] = getDegenerateMesh().release();
+
+    scene->mRootNode = new aiNode;
+    scene->mRootNode->mNumMeshes = 5;
+    scene->mRootNode->mMeshes = new unsigned int[5];
+    scene->mRootNode->mMeshes[0] = 0;
+    scene->mRootNode->mMeshes[1] = 1;
+    scene->mRootNode->mMeshes[2] = 2;
+    scene->mRootNode->mMeshes[3] = 3;
+    scene->mRootNode->mMeshes[4] = 4;
+
+    mProcess->Execute(scene.get());
+
+    EXPECT_EQ(scene->mNumMeshes, 1u);
+    EXPECT_EQ(scene->mMeshes[0], meshWhichSurvives);
+    EXPECT_EQ(scene->mRootNode->mNumMeshes, 1u);
+    EXPECT_EQ(scene->mRootNode->mMeshes[0], 0u);
+}