diff --git a/code/AssetLib/DXF/DXFLoader.cpp b/code/AssetLib/DXF/DXFLoader.cpp
index 3b20678ad..2f1aa6961 100644
--- a/code/AssetLib/DXF/DXFLoader.cpp
+++ b/code/AssetLib/DXF/DXFLoader.cpp
@@ -378,6 +378,11 @@ void DXFImporter::ExpandBlockReferences(DXF::Block& bl,const DXF::BlockMap& bloc
         const DXF::Block& bl_src = *(*it).second;
 
         for (std::shared_ptr<const DXF::PolyLine> pl_in : bl_src.lines) {
+            if (!pl_in) {
+                ASSIMP_LOG_ERROR("DXF: PolyLine instance is nullptr, skipping.");
+                continue;
+            }
+            
             std::shared_ptr<DXF::PolyLine> pl_out = std::shared_ptr<DXF::PolyLine>(new DXF::PolyLine(*pl_in));
 
             if (bl_src.base.Length() || insert.scale.x!=1.f || insert.scale.y!=1.f || insert.scale.z!=1.f || insert.angle || insert.pos.Length()) {
diff --git a/code/AssetLib/FBX/FBXConverter.cpp b/code/AssetLib/FBX/FBXConverter.cpp
index 098ba58e2..5a3ae0ae7 100644
--- a/code/AssetLib/FBX/FBXConverter.cpp
+++ b/code/AssetLib/FBX/FBXConverter.cpp
@@ -79,7 +79,7 @@ using namespace Util;
 
 #define MAGIC_NODE_TAG "_$AssimpFbx$"
 
-#define CONVERT_FBX_TIME(time) (static_cast<double>(time) * 1000.0 / 46186158000LL)
+#define CONVERT_FBX_TIME(time) static_cast<double>(time) / 46186158000LL
 
 FBXConverter::FBXConverter(aiScene *out, const Document &doc, bool removeEmptyBones) :
         defaultMaterialIndex(),
@@ -2618,7 +2618,7 @@ void FBXConverter::ConvertAnimationStack(const AnimationStack &st) {
                     meshMorphAnim->mKeys[j].mNumValuesAndWeights = numValuesAndWeights;
                     meshMorphAnim->mKeys[j].mValues = new unsigned int[numValuesAndWeights];
                     meshMorphAnim->mKeys[j].mWeights = new double[numValuesAndWeights];
-                    meshMorphAnim->mKeys[j].mTime = CONVERT_FBX_TIME(animIt.first);
+                    meshMorphAnim->mKeys[j].mTime = CONVERT_FBX_TIME(animIt.first) * anim_fps;
                     for (unsigned int k = 0; k < numValuesAndWeights; k++) {
                         meshMorphAnim->mKeys[j].mValues[k] = keyData->values.at(k);
                         meshMorphAnim->mKeys[j].mWeights[k] = keyData->weights.at(k);
@@ -2636,8 +2636,8 @@ void FBXConverter::ConvertAnimationStack(const AnimationStack &st) {
         return;
     }
 
-    double start_time_fps = has_local_startstop ? CONVERT_FBX_TIME(start_time) : min_time;
-    double stop_time_fps = has_local_startstop ? CONVERT_FBX_TIME(stop_time) : max_time;
+    double start_time_fps = has_local_startstop ? (CONVERT_FBX_TIME(start_time) * anim_fps) : min_time;
+    double stop_time_fps = has_local_startstop ? (CONVERT_FBX_TIME(stop_time) * anim_fps) : max_time;
 
     // adjust relative timing for animation
     for (unsigned int c = 0; c < anim->mNumChannels; c++) {
@@ -3162,7 +3162,7 @@ aiNodeAnim* FBXConverter::GenerateSimpleNodeAnim(const std::string& name,
         InterpolateKeys(outTranslations, keytimes, keyframeLists[TransformationComp_Translation], defTranslate, maxTime, minTime);
     } else {
         for (size_t i = 0; i < keyCount; ++i) {
-            outTranslations[i].mTime = CONVERT_FBX_TIME(keytimes[i]);
+            outTranslations[i].mTime = CONVERT_FBX_TIME(keytimes[i]) * anim_fps;
             outTranslations[i].mValue = defTranslate;
         }
     }
@@ -3171,7 +3171,7 @@ aiNodeAnim* FBXConverter::GenerateSimpleNodeAnim(const std::string& name,
         InterpolateKeys(outRotations, keytimes, keyframeLists[TransformationComp_Rotation], defRotation, maxTime, minTime, rotOrder);
     } else {
         for (size_t i = 0; i < keyCount; ++i) {
-            outRotations[i].mTime = CONVERT_FBX_TIME(keytimes[i]);
+            outRotations[i].mTime = CONVERT_FBX_TIME(keytimes[i]) * anim_fps;
             outRotations[i].mValue = defQuat;
         }
     }
@@ -3180,7 +3180,7 @@ aiNodeAnim* FBXConverter::GenerateSimpleNodeAnim(const std::string& name,
         InterpolateKeys(outScales, keytimes, keyframeLists[TransformationComp_Scaling], defScale, maxTime, minTime);
     } else {
         for (size_t i = 0; i < keyCount; ++i) {
-            outScales[i].mTime = CONVERT_FBX_TIME(keytimes[i]);
+            outScales[i].mTime = CONVERT_FBX_TIME(keytimes[i]) * anim_fps;
             outScales[i].mValue = defScale;
         }
     }
@@ -3442,7 +3442,7 @@ void FBXConverter::InterpolateKeys(aiVectorKey *valOut, const KeyTimeList &keys,
         }
 
         // magic value to convert fbx times to seconds
-        valOut->mTime = CONVERT_FBX_TIME(time);
+        valOut->mTime = CONVERT_FBX_TIME(time) * anim_fps;
 
         min_time = std::min(min_time, valOut->mTime);
         max_time = std::max(max_time, valOut->mTime);
diff --git a/code/AssetLib/HMP/HMPLoader.cpp b/code/AssetLib/HMP/HMPLoader.cpp
index 661e4d1b2..0bc152680 100644
--- a/code/AssetLib/HMP/HMPLoader.cpp
+++ b/code/AssetLib/HMP/HMPLoader.cpp
@@ -473,16 +473,22 @@ void HMPImporter::ReadFirstSkin(unsigned int iNumSkins, const unsigned char *szC
 
 // ------------------------------------------------------------------------------------------------
 // Generate proepr texture coords
-void HMPImporter::GenerateTextureCoords(
-        const unsigned int width, const unsigned int height) {
+void HMPImporter::GenerateTextureCoords(const unsigned int width, const unsigned int height) {
     ai_assert(nullptr != pScene->mMeshes);
     ai_assert(nullptr != pScene->mMeshes[0]);
     ai_assert(nullptr != pScene->mMeshes[0]->mTextureCoords[0]);
 
     aiVector3D *uv = pScene->mMeshes[0]->mTextureCoords[0];
-
-    const float fY = (1.0f / height) + (1.0f / height) / (height - 1);
-    const float fX = (1.0f / width) + (1.0f / width) / (width - 1);
+    if (uv == nullptr) {
+        return;
+    }
+    
+    if (height == 0.0f || width == 0.0) {
+        return;
+    }
+    
+    const float fY = (1.0f / height) + (1.0f / height) / height;
+    const float fX = (1.0f / width) + (1.0f / width) / width;
 
     for (unsigned int y = 0; y < height; ++y) {
         for (unsigned int x = 0; x < width; ++x, ++uv) {
diff --git a/code/AssetLib/X3D/X3DImporter_Geometry3D.cpp b/code/AssetLib/X3D/X3DImporter_Geometry3D.cpp
index 2db62dc64..b9fc2a4d8 100644
--- a/code/AssetLib/X3D/X3DImporter_Geometry3D.cpp
+++ b/code/AssetLib/X3D/X3DImporter_Geometry3D.cpp
@@ -879,7 +879,7 @@ void X3DImporter::readSphere(XmlNode &node) {
     X3DNodeElementBase *ne(nullptr);
 
     MACRO_ATTRREAD_CHECKUSEDEF_RET(node, def, use);
-    XmlParser::getFloatAttribute(node, "radius", radius);
+    XmlParser::getRealAttribute(node, "radius", radius);
     XmlParser::getBoolAttribute(node, "solid", solid);
 
     // if "USE" defined then find already defined element.
diff --git a/code/AssetLib/glTF2/glTF2Exporter.cpp b/code/AssetLib/glTF2/glTF2Exporter.cpp
index e5c8b4530..606a4a919 100644
--- a/code/AssetLib/glTF2/glTF2Exporter.cpp
+++ b/code/AssetLib/glTF2/glTF2Exporter.cpp
@@ -1410,7 +1410,7 @@ void glTF2Exporter::ExportMetadata() {
     }
 }
 
-inline Ref<Accessor> GetSamplerInputRef(Asset &asset, std::string &animId, Ref<Buffer> &buffer, std::vector<float> &times) {
+inline Ref<Accessor> GetSamplerInputRef(Asset &asset, std::string &animId, Ref<Buffer> &buffer, std::vector<ai_real> &times) {
     return ExportData(asset, animId, buffer, (unsigned int)times.size(), &times[0], AttribType::SCALAR, AttribType::SCALAR, ComponentType_FLOAT);
 }
 
diff --git a/code/AssetLib/glTF2/glTF2Exporter.h b/code/AssetLib/glTF2/glTF2Exporter.h
index 6d70d915e..d328f8a80 100644
--- a/code/AssetLib/glTF2/glTF2Exporter.h
+++ b/code/AssetLib/glTF2/glTF2Exporter.h
@@ -66,7 +66,9 @@ class Ref;
 }
 
 namespace glTF2 {
+
 class Asset;
+
 struct TexProperty;
 struct TextureInfo;
 struct NormalTextureInfo;
@@ -84,6 +86,7 @@ struct MaterialIOR;
 typedef float(vec2)[2];
 typedef float(vec3)[3];
 typedef float(vec4)[4];
+
 } // namespace glTF2
 
 namespace Assimp {
diff --git a/code/Common/PolyTools.h b/code/Common/PolyTools.h
index e660ce49b..15276184e 100644
--- a/code/Common/PolyTools.h
+++ b/code/Common/PolyTools.h
@@ -4,7 +4,6 @@ Open Asset Import Library (assimp)
 
 Copyright (c) 2006-2021, assimp team
 
-
 All rights reserved.
 
 Redistribution and use of this software in source and binary forms,
@@ -42,6 +41,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 /** @file PolyTools.h, various utilities for our dealings with arbitrary polygons */
 
+#pragma once
 #ifndef AI_POLYTOOLS_H_INCLUDED
 #define AI_POLYTOOLS_H_INCLUDED
 
@@ -55,8 +55,7 @@ namespace Assimp {
  *  The function accepts an unconstrained template parameter for use with
  *  both aiVector3D and aiVector2D, but generally ignores the third coordinate.*/
 template <typename T>
-inline double GetArea2D(const T& v1, const T& v2, const T& v3)
-{
+inline double GetArea2D(const T& v1, const T& v2, const T& v3) {
     return 0.5 * (v1.x * ((double)v3.y - v2.y) + v2.x * ((double)v1.y - v3.y) + v3.x * ((double)v2.y - v1.y));
 }
 
@@ -65,8 +64,7 @@ inline double GetArea2D(const T& v1, const T& v2, const T& v3)
  *  The function accepts an unconstrained template parameter for use with
  *  both aiVector3D and aiVector2D, but generally ignores the third coordinate.*/
 template <typename T>
-inline bool OnLeftSideOfLine2D(const T& p0, const T& p1,const T& p2)
-{
+inline bool OnLeftSideOfLine2D(const T& p0, const T& p1,const T& p2) {
     return GetArea2D(p0,p2,p1) > 0;
 }
 
@@ -75,20 +73,23 @@ inline bool OnLeftSideOfLine2D(const T& p0, const T& p1,const T& p2)
  * The function accepts an unconstrained template parameter for use with
  *  both aiVector3D and aiVector2D, but generally ignores the third coordinate.*/
 template <typename T>
-inline bool PointInTriangle2D(const T& p0, const T& p1,const T& p2, const T& pp)
-{
+inline bool PointInTriangle2D(const T& p0, const T& p1,const T& p2, const T& pp) {
     // Point in triangle test using baryzentric coordinates
     const aiVector2D v0 = p1 - p0;
     const aiVector2D v1 = p2 - p0;
     const aiVector2D v2 = pp - p0;
 
     double dot00 = v0 * v0;
-    double dot01 = v0 * v1;
-    double dot02 = v0 * v2;
     double dot11 = v1 * v1;
-    double dot12 = v1 * v2;
-
-    const double invDenom = 1 / (dot00 * dot11 - dot01 * dot01);
+    const double dot01 = v0 * v1;
+    const double dot02 = v0 * v2;
+    const double dot12 = v1 * v2;
+    const double denom = dot00 * dot11 - dot01 * dot01;
+    if (denom == 0.0) {
+        return false;
+    }
+    
+    const double invDenom = 1.0 / denom;
     dot11 = (dot11 * dot02 - dot01 * dot12) * invDenom;
     dot00 = (dot00 * dot12 - dot01 * dot02) * invDenom;
 
@@ -133,8 +134,7 @@ inline bool IsCCW(T* in, size_t npoints) {
             //      in[i+2].x, in[i+2].y)) {
             convex_turn = AI_MATH_PI_F - theta;
             convex_sum += convex_turn;
-        }
-        else {
+        } else {
             convex_sum -= AI_MATH_PI_F - theta;
         }
     }
@@ -161,15 +161,13 @@ inline bool IsCCW(T* in, size_t npoints) {
     if (OnLeftSideOfLine2D(in[npoints-2],in[1],in[0])) {
         convex_turn = AI_MATH_PI_F - theta;
         convex_sum += convex_turn;
-    }
-    else {
+    } else {
         convex_sum -= AI_MATH_PI_F - theta;
     }
 
     return convex_sum >= (2 * AI_MATH_PI_F);
 }
 
-
 // -------------------------------------------------------------------------------
 /** Compute the normal of an arbitrary polygon in R3.
  *
@@ -186,8 +184,7 @@ inline bool IsCCW(T* in, size_t npoints) {
  *  this method is much faster than the 'other' NewellNormal()
  */
 template <int ofs_x, int ofs_y, int ofs_z, typename TReal>
-inline void NewellNormal (aiVector3t<TReal>& out, int num, TReal* x, TReal* y, TReal* z)
-{
+inline void NewellNormal (aiVector3t<TReal>& out, int num, TReal* x, TReal* y, TReal* z) {
     // Duplicate the first two vertices at the end
     x[(num+0)*ofs_x] = x[0];
     x[(num+1)*ofs_x] = x[ofs_x];
@@ -224,6 +221,6 @@ inline void NewellNormal (aiVector3t<TReal>& out, int num, TReal* x, TReal* y, T
     out = aiVector3t<TReal>(sum_yz,sum_zx,sum_xy);
 }
 
-} // ! Assimp
+} // ! namespace Assimp
 
-#endif
+#endif // AI_POLYTOOLS_H_INCLUDED
diff --git a/code/Common/SceneCombiner.cpp b/code/Common/SceneCombiner.cpp
index 8f10d6308..7dbbf8860 100644
--- a/code/Common/SceneCombiner.cpp
+++ b/code/Common/SceneCombiner.cpp
@@ -1101,6 +1101,14 @@ void SceneCombiner::Copy(aiMesh **_dest, const aiMesh *src) {
 
     // make a deep copy of all blend shapes
     CopyPtrArray(dest->mAnimMeshes, dest->mAnimMeshes, dest->mNumAnimMeshes);
+
+    // make a deep copy of all texture coordinate names
+    if (src->mTextureCoordsNames != nullptr) {
+        dest->mTextureCoordsNames = new aiString *[AI_MAX_NUMBER_OF_TEXTURECOORDS] {};
+        for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
+            Copy(&dest->mTextureCoordsNames[i], src->mTextureCoordsNames[i]);
+        }
+    }
 }
 
 // ------------------------------------------------------------------------------------------------
@@ -1348,6 +1356,18 @@ void SceneCombiner::Copy(aiMetadata **_dest, const aiMetadata *src) {
     }
 }
 
+// ------------------------------------------------------------------------------------------------
+void SceneCombiner::Copy(aiString **_dest, const aiString *src) {
+    if (nullptr == _dest || nullptr == src) {
+        return;
+    }
+
+    aiString *dest = *_dest = new aiString();
+
+    // get a flat copy
+    *dest = *src;
+}
+
 #if (__GNUC__ >= 8 && __GNUC_MINOR__ >= 0)
 #pragma GCC diagnostic pop
 #endif
diff --git a/include/assimp/SceneCombiner.h b/include/assimp/SceneCombiner.h
index 809ac30e4..874a885a5 100644
--- a/include/assimp/SceneCombiner.h
+++ b/include/assimp/SceneCombiner.h
@@ -361,6 +361,7 @@ public:
     static void Copy(aiNodeAnim **dest, const aiNodeAnim *src);
     static void Copy(aiMeshMorphAnim **dest, const aiMeshMorphAnim *src);
     static void Copy(aiMetadata **dest, const aiMetadata *src);
+    static void Copy(aiString **dest, const aiString *src);
 
     // recursive, of course
     static void Copy(aiNode **dest, const aiNode *src);
diff --git a/include/assimp/SkeletonMeshBuilder.h b/include/assimp/SkeletonMeshBuilder.h
index 2479f4308..37d12f03d 100644
--- a/include/assimp/SkeletonMeshBuilder.h
+++ b/include/assimp/SkeletonMeshBuilder.h
@@ -6,7 +6,6 @@ Open Asset Import Library (assimp)
 
 Copyright (c) 2006-2021, assimp team
 
-
 All rights reserved.
 
 Redistribution and use of this software in source and binary forms,
@@ -102,7 +101,7 @@ protected:
     /** Creates a dummy material and returns it. */
     aiMaterial *CreateMaterial();
 
-protected:
+private:
     /** space to assemble the mesh data: points */
     std::vector<aiVector3D> mVertices;
 
diff --git a/include/assimp/color4.h b/include/assimp/color4.h
index fdd8f031e..573745ed6 100644
--- a/include/assimp/color4.h
+++ b/include/assimp/color4.h
@@ -5,8 +5,6 @@ Open Asset Import Library (assimp)
 
 Copyright (c) 2006-2021, assimp team
 
-
-
 All rights reserved.
 
 Redistribution and use of this software in source and binary forms,
diff --git a/include/assimp/light.h b/include/assimp/light.h
index f35f51e0a..46acad5fd 100644
--- a/include/assimp/light.h
+++ b/include/assimp/light.h
@@ -255,5 +255,4 @@ struct aiLight {
 }
 #endif
 
-
 #endif // !! AI_LIGHT_H_INC
diff --git a/include/assimp/material.inl b/include/assimp/material.inl
index 693785c3c..7a3cce741 100644
--- a/include/assimp/material.inl
+++ b/include/assimp/material.inl
@@ -44,21 +44,17 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #pragma once
-#ifndef AI_MATERIAL_INL_INC
-#define AI_MATERIAL_INL_INC
 
 #ifdef __GNUC__
 #   pragma GCC system_header
 #endif
 
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiPropertyTypeInfo ai_real_to_property_type_info(float) {
+AI_FORCE_INLINE aiPropertyTypeInfo ai_real_to_property_type_info(float) {
 	return aiPTI_Float;
 }
 
-AI_FORCE_INLINE
-aiPropertyTypeInfo ai_real_to_property_type_info(double) {
+AI_FORCE_INLINE aiPropertyTypeInfo ai_real_to_property_type_info(double) {
 	return aiPTI_Double;
 }
 // ---------------------------------------------------------------------------
@@ -66,8 +62,7 @@ aiPropertyTypeInfo ai_real_to_property_type_info(double) {
 //! @cond never
 
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::GetTexture( aiTextureType type,
+AI_FORCE_INLINE aiReturn aiMaterial::GetTexture( aiTextureType type,
        unsigned int  index,
        C_STRUCT aiString* path,
        aiTextureMapping* mapping    /*= NULL*/,
@@ -79,15 +74,13 @@ aiReturn aiMaterial::GetTexture( aiTextureType type,
 }
 
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-unsigned int aiMaterial::GetTextureCount(aiTextureType type) const {
+AI_FORCE_INLINE unsigned int aiMaterial::GetTextureCount(aiTextureType type) const {
     return ::aiGetMaterialTextureCount(this,type);
 }
 
 // ---------------------------------------------------------------------------
 template <typename Type>
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
+AI_FORCE_INLINE aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
         unsigned int idx, Type* pOut,
         unsigned int* pMax) const {
     unsigned int iNum = pMax ? *pMax : 1;
@@ -105,7 +98,7 @@ aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
             return AI_FAILURE;
         }
 
-        iNum = std::min((size_t)iNum,prop->mDataLength / sizeof(Type));
+        iNum = static_cast<unsigned int>(std::min(static_cast<size_t>(iNum),prop->mDataLength / sizeof(Type)));
         ::memcpy(pOut,prop->mData,iNum * sizeof(Type));
         if (pMax) {
             *pMax = iNum;
@@ -116,8 +109,7 @@ aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
 
 // ---------------------------------------------------------------------------
 template <typename Type>
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
+AI_FORCE_INLINE aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
         unsigned int idx,Type& pOut) const {
     const aiMaterialProperty* prop;
     const aiReturn ret = ::aiGetMaterialProperty(this,pKey,type,idx,
@@ -138,34 +130,29 @@ aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
 }
 
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
+AI_FORCE_INLINE aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
         unsigned int idx,ai_real* pOut,
         unsigned int* pMax) const {
     return ::aiGetMaterialFloatArray(this,pKey,type,idx,pOut,pMax);
 }
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
+AI_FORCE_INLINE aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
         unsigned int idx,int* pOut,
         unsigned int* pMax) const {
     return ::aiGetMaterialIntegerArray(this,pKey,type,idx,pOut,pMax);
 }
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
+AI_FORCE_INLINE aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
         unsigned int idx,ai_real& pOut) const {
     return aiGetMaterialFloat(this,pKey,type,idx,&pOut);
 }
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
+AI_FORCE_INLINE aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
         unsigned int idx,int& pOut) const {
     return aiGetMaterialInteger(this,pKey,type,idx,&pOut);
 }
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
+AI_FORCE_INLINE aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
         unsigned int idx,aiColor4D& pOut) const {
     return aiGetMaterialColor(this,pKey,type,idx,&pOut);
 }
@@ -190,14 +177,10 @@ AI_FORCE_INLINE aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
 
 // ---------------------------------------------------------------------------
 template<class TYPE>
-aiReturn aiMaterial::AddProperty (const TYPE* pInput,
-    const unsigned int pNumValues,
-    const char* pKey,
-    unsigned int type,
-    unsigned int index)
-{
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(TYPE),
+aiReturn aiMaterial::AddProperty (const TYPE* pInput, 
+        const unsigned int pNumValues, const char* pKey, unsigned int type, 
+        unsigned int index) {
+    return AddBinaryProperty((const void*)pInput, pNumValues * sizeof(TYPE),
         pKey,type,index,aiPTI_Buffer);
 }
 
@@ -213,8 +196,7 @@ AI_FORCE_INLINE aiReturn aiMaterial::AddProperty(const float* pInput,
 }
 
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty(const double* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty(const double* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -225,8 +207,7 @@ aiReturn aiMaterial::AddProperty(const double* pInput,
 }
 
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty(const aiUVTransform* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty(const aiUVTransform* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -237,8 +218,7 @@ aiReturn aiMaterial::AddProperty(const aiUVTransform* pInput,
 }
 
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty(const aiColor4D* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty(const aiColor4D* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -249,8 +229,7 @@ aiReturn aiMaterial::AddProperty(const aiColor4D* pInput,
 }
 
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty(const aiColor3D* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty(const aiColor3D* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -261,8 +240,7 @@ aiReturn aiMaterial::AddProperty(const aiColor3D* pInput,
 }
 
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty(const aiVector3D* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty(const aiVector3D* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -273,8 +251,7 @@ aiReturn aiMaterial::AddProperty(const aiVector3D* pInput,
 }
 
 // ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty(const int* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty(const int* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -293,8 +270,7 @@ aiReturn aiMaterial::AddProperty(const int* pInput,
 
 // ---------------------------------------------------------------------------
 template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<float>(const float* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty<float>(const float* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -306,8 +282,7 @@ aiReturn aiMaterial::AddProperty<float>(const float* pInput,
 
 // ---------------------------------------------------------------------------
 template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<double>(const double* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty<double>(const double* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -319,8 +294,7 @@ aiReturn aiMaterial::AddProperty<double>(const double* pInput,
 
 // ---------------------------------------------------------------------------
 template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<aiUVTransform>(const aiUVTransform* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty<aiUVTransform>(const aiUVTransform* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -332,8 +306,7 @@ aiReturn aiMaterial::AddProperty<aiUVTransform>(const aiUVTransform* pInput,
 
 // ---------------------------------------------------------------------------
 template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<aiColor4D>(const aiColor4D* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty<aiColor4D>(const aiColor4D* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -345,8 +318,7 @@ aiReturn aiMaterial::AddProperty<aiColor4D>(const aiColor4D* pInput,
 
 // ---------------------------------------------------------------------------
 template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<aiColor3D>(const aiColor3D* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty<aiColor3D>(const aiColor3D* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -358,8 +330,7 @@ aiReturn aiMaterial::AddProperty<aiColor3D>(const aiColor3D* pInput,
 
 // ---------------------------------------------------------------------------
 template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<aiVector3D>(const aiVector3D* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty<aiVector3D>(const aiVector3D* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -371,8 +342,7 @@ aiReturn aiMaterial::AddProperty<aiVector3D>(const aiVector3D* pInput,
 
 // ---------------------------------------------------------------------------
 template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<int>(const int* pInput,
+AI_FORCE_INLINE aiReturn aiMaterial::AddProperty<int>(const int* pInput,
         const unsigned int pNumValues,
         const char* pKey,
         unsigned int type,
@@ -383,5 +353,3 @@ aiReturn aiMaterial::AddProperty<int>(const int* pInput,
 }
 
 //! @endcond
-
-#endif //! AI_MATERIAL_INL_INC
diff --git a/include/assimp/texture.h b/include/assimp/texture.h
index 7a9d38cc0..ec156114b 100644
--- a/include/assimp/texture.h
+++ b/include/assimp/texture.h
@@ -92,22 +92,19 @@ struct aiTexel {
 
 #ifdef __cplusplus
     //! Comparison operator
-    bool operator== (const aiTexel& other) const
-    {
+    bool operator== (const aiTexel& other) const {
         return b == other.b && r == other.r &&
                g == other.g && a == other.a;
     }
 
     //! Inverse comparison operator
-    bool operator!= (const aiTexel& other) const
-    {
+    bool operator!= (const aiTexel& other) const {
         return b != other.b || r != other.r ||
                g != other.g || a != other.a;
     }
 
     //! Conversion to a floating-point 4d color
-    operator aiColor4D() const
-    {
+    operator aiColor4D() const {
         return aiColor4D(r/255.f,g/255.f,b/255.f,a/255.f);
     }
 #endif // __cplusplus
@@ -202,11 +199,11 @@ struct aiTexture {
     }
 
     // Construction
-    aiTexture() AI_NO_EXCEPT
-    : mWidth(0)
-    , mHeight(0)
-    , pcData(nullptr)
-    , mFilename() {
+    aiTexture() AI_NO_EXCEPT :
+            mWidth(0),
+            mHeight(0),
+            pcData(nullptr),
+            mFilename() {
         memset(achFormatHint, 0, sizeof(achFormatHint));
     }
 
diff --git a/include/assimp/vector2.h b/include/assimp/vector2.h
index 34adf894b..586d63244 100644
--- a/include/assimp/vector2.h
+++ b/include/assimp/vector2.h
@@ -5,8 +5,6 @@ Open Asset Import Library (assimp)
 
 Copyright (c) 2006-2021, assimp team
 
-
-
 All rights reserved.
 
 Redistribution and use of this software in source and binary forms,
diff --git a/include/assimp/vector3.inl b/include/assimp/vector3.inl
index 0076d2a85..80d2c55a1 100644
--- a/include/assimp/vector3.inl
+++ b/include/assimp/vector3.inl
@@ -54,8 +54,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 // ------------------------------------------------------------------------------------------------
 /** Transformation of a vector by a 3x3 matrix */
 template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator * (const aiMatrix3x3t<TReal>& pMatrix, const aiVector3t<TReal>& pVector) {
+AI_FORCE_INLINE aiVector3t<TReal> operator * (const aiMatrix3x3t<TReal>& pMatrix, const aiVector3t<TReal>& pVector) {
     aiVector3t<TReal> res;
     res.x = pMatrix.a1 * pVector.x + pMatrix.a2 * pVector.y + pMatrix.a3 * pVector.z;
     res.y = pMatrix.b1 * pVector.x + pMatrix.b2 * pVector.y + pMatrix.b3 * pVector.z;
@@ -66,8 +65,7 @@ aiVector3t<TReal> operator * (const aiMatrix3x3t<TReal>& pMatrix, const aiVector
 // ------------------------------------------------------------------------------------------------
 /** Transformation of a vector by a 4x4 matrix */
 template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator * (const aiMatrix4x4t<TReal>& pMatrix, const aiVector3t<TReal>& pVector) {
+AI_FORCE_INLINE aiVector3t<TReal> operator * (const aiMatrix4x4t<TReal>& pMatrix, const aiVector3t<TReal>& pVector) {
     aiVector3t<TReal> res;
     res.x = pMatrix.a1 * pVector.x + pMatrix.a2 * pVector.y + pMatrix.a3 * pVector.z + pMatrix.a4;
     res.y = pMatrix.b1 * pVector.x + pMatrix.b2 * pVector.y + pMatrix.b3 * pVector.z + pMatrix.b4;
@@ -82,36 +80,35 @@ aiVector3t<TReal>::operator aiVector3t<TOther> () const {
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-void aiVector3t<TReal>::Set( TReal pX, TReal pY, TReal pZ) {
+AI_FORCE_INLINE void aiVector3t<TReal>::Set( TReal pX, TReal pY, TReal pZ) {
     x = pX;
     y = pY;
     z = pZ;
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-TReal aiVector3t<TReal>::SquareLength() const {
+AI_FORCE_INLINE TReal aiVector3t<TReal>::SquareLength() const {
     return x*x + y*y + z*z;
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-TReal aiVector3t<TReal>::Length() const {
+AI_FORCE_INLINE TReal aiVector3t<TReal>::Length() const {
     return std::sqrt( SquareLength());
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal>& aiVector3t<TReal>::Normalize() {
+ aiVector3t<TReal>& aiVector3t<TReal>::Normalize() {
+    const TReal l = Length();
+    if (l == 0) {
+        return *this;
+    }
     *this /= Length();
 
     return *this;
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal>& aiVector3t<TReal>::NormalizeSafe() {
+AI_FORCE_INLINE aiVector3t<TReal>& aiVector3t<TReal>::NormalizeSafe() {
     TReal len = Length();
     if ( len > static_cast< TReal >( 0 ) ) {
         *this /= len;
@@ -120,8 +117,7 @@ aiVector3t<TReal>& aiVector3t<TReal>::NormalizeSafe() {
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-const aiVector3t<TReal>& aiVector3t<TReal>::operator += (const aiVector3t<TReal>& o) {
+AI_FORCE_INLINE const aiVector3t<TReal>& aiVector3t<TReal>::operator += (const aiVector3t<TReal>& o) {
     x += o.x;
     y += o.y;
     z += o.z;
@@ -130,8 +126,7 @@ const aiVector3t<TReal>& aiVector3t<TReal>::operator += (const aiVector3t<TReal>
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-const aiVector3t<TReal>& aiVector3t<TReal>::operator -= (const aiVector3t<TReal>& o) {
+AI_FORCE_INLINE const aiVector3t<TReal>& aiVector3t<TReal>::operator -= (const aiVector3t<TReal>& o) {
     x -= o.x;
     y -= o.y;
     z -= o.z;
@@ -140,8 +135,7 @@ const aiVector3t<TReal>& aiVector3t<TReal>::operator -= (const aiVector3t<TReal>
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-const aiVector3t<TReal>& aiVector3t<TReal>::operator *= (TReal f) {
+AI_FORCE_INLINE const aiVector3t<TReal>& aiVector3t<TReal>::operator *= (TReal f) {
     x *= f;
     y *= f;
     z *= f;
@@ -150,8 +144,7 @@ const aiVector3t<TReal>& aiVector3t<TReal>::operator *= (TReal f) {
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-const aiVector3t<TReal>& aiVector3t<TReal>::operator /= (TReal f) {
+AI_FORCE_INLINE const aiVector3t<TReal>& aiVector3t<TReal>::operator /= (TReal f) {
     if ( f == static_cast<TReal>(0.0)) {
         return *this;
     }
@@ -164,20 +157,17 @@ const aiVector3t<TReal>& aiVector3t<TReal>::operator /= (TReal f) {
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal>& aiVector3t<TReal>::operator *= (const aiMatrix3x3t<TReal>& mat){
+AI_FORCE_INLINE aiVector3t<TReal>& aiVector3t<TReal>::operator *= (const aiMatrix3x3t<TReal>& mat){
     return (*this =  mat * (*this));
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal>& aiVector3t<TReal>::operator *= (const aiMatrix4x4t<TReal>& mat){
+AI_FORCE_INLINE aiVector3t<TReal>& aiVector3t<TReal>::operator *= (const aiMatrix4x4t<TReal>& mat){
     return (*this = mat * (*this));
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-TReal aiVector3t<TReal>::operator[](unsigned int i) const {
+AI_FORCE_INLINE TReal aiVector3t<TReal>::operator[](unsigned int i) const {
     switch (i) {
         case 0:
             return x;
@@ -192,9 +182,7 @@ TReal aiVector3t<TReal>::operator[](unsigned int i) const {
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-TReal& aiVector3t<TReal>::operator[](unsigned int i) {
-//    return *(&x + i);
+AI_FORCE_INLINE TReal& aiVector3t<TReal>::operator[](unsigned int i) {
     switch (i) {
         case 0:
             return x;
@@ -209,20 +197,17 @@ TReal& aiVector3t<TReal>::operator[](unsigned int i) {
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-bool aiVector3t<TReal>::operator== (const aiVector3t<TReal>& other) const {
+AI_FORCE_INLINE bool aiVector3t<TReal>::operator== (const aiVector3t<TReal>& other) const {
     return x == other.x && y == other.y && z == other.z;
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-bool aiVector3t<TReal>::operator!= (const aiVector3t<TReal>& other) const {
+AI_FORCE_INLINE bool aiVector3t<TReal>::operator!= (const aiVector3t<TReal>& other) const {
     return x != other.x || y != other.y || z != other.z;
 }
 // ---------------------------------------------------------------------------
 template<typename TReal>
-AI_FORCE_INLINE
-bool aiVector3t<TReal>::Equal(const aiVector3t<TReal>& other, TReal epsilon) const {
+AI_FORCE_INLINE bool aiVector3t<TReal>::Equal(const aiVector3t<TReal>& other, TReal epsilon) const {
     return
         std::abs(x - other.x) <= epsilon &&
         std::abs(y - other.y) <= epsilon &&
@@ -230,77 +215,66 @@ bool aiVector3t<TReal>::Equal(const aiVector3t<TReal>& other, TReal epsilon) con
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-bool aiVector3t<TReal>::operator < (const aiVector3t<TReal>& other) const {
+AI_FORCE_INLINE bool aiVector3t<TReal>::operator < (const aiVector3t<TReal>& other) const {
     return x != other.x ? x < other.x : y != other.y ? y < other.y : z < other.z;
 }
 // ------------------------------------------------------------------------------------------------
 template <typename TReal>
-AI_FORCE_INLINE
-const aiVector3t<TReal> aiVector3t<TReal>::SymMul(const aiVector3t<TReal>& o) {
+AI_FORCE_INLINE const aiVector3t<TReal> aiVector3t<TReal>::SymMul(const aiVector3t<TReal>& o) {
     return aiVector3t<TReal>(x*o.x,y*o.y,z*o.z);
 }
 // ------------------------------------------------------------------------------------------------
 // symmetric addition
 template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator + (const aiVector3t<TReal>& v1, const aiVector3t<TReal>& v2) {
+AI_FORCE_INLINE aiVector3t<TReal> operator + (const aiVector3t<TReal>& v1, const aiVector3t<TReal>& v2) {
     return aiVector3t<TReal>( v1.x + v2.x, v1.y + v2.y, v1.z + v2.z);
 }
 // ------------------------------------------------------------------------------------------------
 // symmetric subtraction
 template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator - (const aiVector3t<TReal>& v1, const aiVector3t<TReal>& v2) {
+AI_FORCE_INLINE aiVector3t<TReal> operator - (const aiVector3t<TReal>& v1, const aiVector3t<TReal>& v2) {
     return aiVector3t<TReal>( v1.x - v2.x, v1.y - v2.y, v1.z - v2.z);
 }
 // ------------------------------------------------------------------------------------------------
 // scalar product
 template <typename TReal>
-AI_FORCE_INLINE
-TReal operator * (const aiVector3t<TReal>& v1, const aiVector3t<TReal>& v2) {
+AI_FORCE_INLINE TReal operator * (const aiVector3t<TReal>& v1, const aiVector3t<TReal>& v2) {
     return v1.x*v2.x + v1.y*v2.y + v1.z*v2.z;
 }
 // ------------------------------------------------------------------------------------------------
 // scalar multiplication
 template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator * ( TReal f, const aiVector3t<TReal>& v) {
+AI_FORCE_INLINE aiVector3t<TReal> operator * ( TReal f, const aiVector3t<TReal>& v) {
     return aiVector3t<TReal>( f*v.x, f*v.y, f*v.z);
 }
 // ------------------------------------------------------------------------------------------------
 // and the other way around
 template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator * ( const aiVector3t<TReal>& v, TReal f) {
+AI_FORCE_INLINE aiVector3t<TReal> operator * ( const aiVector3t<TReal>& v, TReal f) {
     return aiVector3t<TReal>( f*v.x, f*v.y, f*v.z);
 }
 // ------------------------------------------------------------------------------------------------
 // scalar division
 template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator / ( const aiVector3t<TReal>& v, TReal f) {
+AI_FORCE_INLINE aiVector3t<TReal> operator / ( const aiVector3t<TReal>& v, TReal f) {
     return v * (1/f);
 }
 // ------------------------------------------------------------------------------------------------
 // vector division
 template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator / ( const aiVector3t<TReal>& v, const aiVector3t<TReal>& v2) {
+AI_FORCE_INLINE aiVector3t<TReal> operator / ( const aiVector3t<TReal>& v, const aiVector3t<TReal>& v2) {
     return aiVector3t<TReal>(v.x / v2.x,v.y / v2.y,v.z / v2.z);
 }
 // ------------------------------------------------------------------------------------------------
 // cross product
 template<typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator ^ ( const aiVector3t<TReal>& v1, const aiVector3t<TReal>& v2) {
+AI_FORCE_INLINE aiVector3t<TReal> operator ^ ( const aiVector3t<TReal>& v1, const aiVector3t<TReal>& v2) {
     return aiVector3t<TReal>( v1.y*v2.z - v1.z*v2.y, v1.z*v2.x - v1.x*v2.z, v1.x*v2.y - v1.y*v2.x);
 }
 // ------------------------------------------------------------------------------------------------
 // vector negation
 template<typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator - ( const aiVector3t<TReal>& v) {
+AI_FORCE_INLINE aiVector3t<TReal> operator - ( const aiVector3t<TReal>& v) {
     return aiVector3t<TReal>( -v.x, -v.y, -v.z);
 }
 
diff --git a/test/unit/Common/uiScene.cpp b/test/unit/Common/uiScene.cpp
index 1c531b042..af0b6ca01 100644
--- a/test/unit/Common/uiScene.cpp
+++ b/test/unit/Common/uiScene.cpp
@@ -42,6 +42,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "UnitTestPCH.h"
 
 #include <assimp/scene.h>
+#include <assimp/SceneCombiner.h>
 
 using namespace Assimp;
 
@@ -88,5 +89,21 @@ TEST_F(utScene, getShortFilenameTest) {
 	EXPECT_NE(nullptr, name2);
 }
 
+TEST_F(utScene, deepCopyTest) {
+    scene->mRootNode = new aiNode();
+    
+    scene->mNumMeshes = 1;
+    scene->mMeshes = new aiMesh *[scene->mNumMeshes] ();
+    scene->mMeshes[0] = new aiMesh ();
+
+    scene->mMeshes[0]->SetTextureCoordsName (0, aiString ("test"));
+
+    {
+        aiScene* copied = nullptr;
+        SceneCombiner::CopyScene(&copied,scene);
+        delete copied;
+    }
+}
+
 TEST_F(utScene, getEmbeddedTextureTest) {
 }
diff --git a/test/unit/utMaterialSystem.cpp b/test/unit/utMaterialSystem.cpp
index 8db014d9c..6f1be1608 100644
--- a/test/unit/utMaterialSystem.cpp
+++ b/test/unit/utMaterialSystem.cpp
@@ -73,7 +73,7 @@ TEST_F(MaterialSystemTest, testFloatArrayProperty) {
     pf[0] = pf[1] = pf[2] = pf[3] = 12.0f;
 
     EXPECT_EQ(AI_SUCCESS, pcMat->Get("testKey2", 0, 0, pf, &pMax));
-    EXPECT_EQ(sizeof(pf) / sizeof(float), pMax);
+    EXPECT_EQ(sizeof(pf) / sizeof(float), static_cast<size_t>(pMax));
     EXPECT_TRUE(!pf[0] && 1.0f == pf[1] && 2.0f == pf[2] && 3.0f == pf[3]);
 }