move 3rd-party librarys into libs/ and add built-in honeysuckle

3 files changed, 1493 insertions, 0 deletions

diff --git a/libs/assimp/code/AssetLib/Step/STEPFile.h b/libs/assimp/code/AssetLib/Step/STEPFile.h
new file mode 100644
index 0000000..e09faad
--- /dev/null
+++ b/libs/assimp/code/AssetLib/Step/STEPFile.h
@@ -0,0 +1,971 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2020, 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.
+
+----------------------------------------------------------------------
+*/
+
+#ifndef INCLUDED_AI_STEPFILE_H
+#define INCLUDED_AI_STEPFILE_H
+
+#include <bitset>
+#include <map>
+#include <memory>
+#include <set>
+#include <typeinfo>
+#include <vector>
+
+#include "AssetLib/FBX/FBXDocument.h" //ObjectMap::value_type
+
+#include <assimp/DefaultLogger.hpp>
+
+#ifdef _MSC_VER
+#    pragma warning(push)
+#    pragma warning(disable : 4127 4456 4245 4512 )
+#endif // _MSC_VER
+
+//
+#if _MSC_VER > 1500 || (defined __GNUC___)
+#    define ASSIMP_STEP_USE_UNORDERED_MULTIMAP
+#else
+#    define step_unordered_map map
+#    define step_unordered_multimap multimap
+#endif
+
+#ifdef ASSIMP_STEP_USE_UNORDERED_MULTIMAP
+#    include <unordered_map>
+#    if defined(_MSC_VER) && _MSC_VER <= 1600
+#        define step_unordered_map tr1::unordered_map
+#        define step_unordered_multimap tr1::unordered_multimap
+#    else
+#        define step_unordered_map unordered_map
+#        define step_unordered_multimap unordered_multimap
+#    endif
+#endif
+
+#include <assimp/LineSplitter.h>
+
+// uncomment this to have the loader evaluate all entities upon loading.
+// this is intended as stress test - by default, entities are evaluated
+// lazily and therefore not unless needed.
+
+//#define ASSIMP_IFC_TEST
+
+namespace Assimp {
+
+// ********************************************************************************
+// before things get complicated, this is the basic outline:
+
+namespace STEP {
+
+namespace EXPRESS {
+
+// base data types known by EXPRESS schemata - any custom data types will derive one of those
+class DataType;
+class UNSET; /*: public DataType */
+class ISDERIVED; /*: public DataType */
+//  class REAL;         /*: public DataType */
+class ENUM; /*: public DataType */
+//  class STRING;       /*: public DataType */
+//  class INTEGER;      /*: public DataType */
+class ENTITY; /*: public DataType */
+class LIST; /*: public DataType */
+//  class SELECT;       /*: public DataType */
+
+// a conversion schema is not exactly an EXPRESS schema, rather it
+// is a list of pointers to conversion functions to build up the
+// object tree from an input file.
+class ConversionSchema;
+} // namespace EXPRESS
+
+struct HeaderInfo;
+class Object;
+class LazyObject;
+class DB;
+
+typedef Object *(*ConvertObjectProc)(const DB &db, const EXPRESS::LIST &params);
+} // namespace STEP
+
+// ********************************************************************************
+
+namespace STEP {
+
+// -------------------------------------------------------------------------------
+/** Exception class used by the STEP loading & parsing code. It is typically
+     *  coupled with a line number. */
+// -------------------------------------------------------------------------------
+struct SyntaxError : DeadlyImportError {
+    enum : uint64_t {
+        LINE_NOT_SPECIFIED = 0xfffffffffffffffLL
+    };
+
+    SyntaxError(const std::string &s, uint64_t line = LINE_NOT_SPECIFIED);
+};
+
+// -------------------------------------------------------------------------------
+/** Exception class used by the STEP loading & parsing code when a type
+     *  error (i.e. an entity expects a string but receives a bool) occurs.
+     *  It is typically coupled with both an entity id and a line number.*/
+// -------------------------------------------------------------------------------
+struct TypeError : DeadlyImportError {
+    enum : uint64_t {
+        ENTITY_NOT_SPECIFIED = 0xffffffffffffffffUL,
+        ENTITY_NOT_SPECIFIED_32 = 0x00000000ffffffff
+    };
+
+    TypeError(const std::string &s, uint64_t entity = ENTITY_NOT_SPECIFIED, uint64_t line = SyntaxError::LINE_NOT_SPECIFIED);
+};
+
+// hack to make a given member template-dependent
+template <typename T, typename T2>
+T2 &Couple(T2 &in) {
+    return in;
+}
+
+namespace EXPRESS {
+
+// -------------------------------------------------------------------------------
+//** Base class for all STEP data types */
+// -------------------------------------------------------------------------------
+class DataType {
+public:
+    typedef std::shared_ptr<const DataType> Out;
+
+public:
+    virtual ~DataType() {
+    }
+
+public:
+    template <typename T>
+    const T &To() const {
+        return dynamic_cast<const T &>(*this);
+    }
+
+    template <typename T>
+    T &To() {
+        return dynamic_cast<T &>(*this);
+    }
+
+    template <typename T>
+    const T *ToPtr() const {
+        return dynamic_cast<const T *>(this);
+    }
+
+    template <typename T>
+    T *ToPtr() {
+        return dynamic_cast<T *>(this);
+    }
+
+    // utilities to deal with SELECT entities, which currently lack automatic
+    // conversion support.
+    template <typename T>
+    const T &ResolveSelect(const DB &db) const {
+        return Couple<T>(db).MustGetObject(To<EXPRESS::ENTITY>())->template To<T>();
+    }
+
+    template <typename T>
+    const T *ResolveSelectPtr(const DB &db) const {
+        const EXPRESS::ENTITY *e = ToPtr<EXPRESS::ENTITY>();
+        return e ? Couple<T>(db).MustGetObject(*e)->template ToPtr<T>() : (const T *)0;
+    }
+
+public:
+    /** parse a variable from a string and set 'inout' to the character
+             *  behind the last consumed character. An optional schema enables,
+             *  if specified, automatic conversion of custom data types.
+             *
+             *  @throw SyntaxError
+             */
+    static std::shared_ptr<const EXPRESS::DataType> Parse(const char *&inout,
+            uint64_t line = SyntaxError::LINE_NOT_SPECIFIED,
+            const EXPRESS::ConversionSchema *schema = NULL);
+
+public:
+};
+
+typedef DataType SELECT;
+typedef DataType LOGICAL;
+
+// -------------------------------------------------------------------------------
+/** Sentinel class to represent explicitly unset (optional) fields ($) */
+// -------------------------------------------------------------------------------
+class UNSET : public DataType {
+public:
+private:
+};
+
+// -------------------------------------------------------------------------------
+/** Sentinel class to represent explicitly derived fields (*) */
+// -------------------------------------------------------------------------------
+class ISDERIVED : public DataType {
+public:
+private:
+};
+
+// -------------------------------------------------------------------------------
+/** Shared implementation for some of the primitive data type, i.e. int, float */
+// -------------------------------------------------------------------------------
+template <typename T>
+class PrimitiveDataType : public DataType {
+public:
+    // This is the type that will cd ultimatively be used to
+    // expose this data type to the user.
+    typedef T Out;
+
+    PrimitiveDataType() {}
+    PrimitiveDataType(const T &val) :
+            val(val) {}
+
+    PrimitiveDataType(const PrimitiveDataType &o) {
+        (*this) = o;
+    }
+
+    operator const T &() const {
+        return val;
+    }
+
+    PrimitiveDataType &operator=(const PrimitiveDataType &o) {
+        val = o.val;
+        return *this;
+    }
+
+protected:
+    T val;
+};
+
+typedef PrimitiveDataType<int64_t> INTEGER;
+typedef PrimitiveDataType<double> REAL;
+typedef PrimitiveDataType<double> NUMBER;
+typedef PrimitiveDataType<std::string> STRING;
+
+// -------------------------------------------------------------------------------
+/** Generic base class for all enumerated types */
+// -------------------------------------------------------------------------------
+class ENUMERATION : public STRING {
+public:
+    ENUMERATION(const std::string &val) :
+            STRING(val) {}
+
+private:
+};
+
+typedef ENUMERATION BOOLEAN;
+
+// -------------------------------------------------------------------------------
+/** This is just a reference to an entity/object somewhere else */
+// -------------------------------------------------------------------------------
+class ENTITY : public PrimitiveDataType<uint64_t> {
+public:
+    ENTITY(uint64_t val) :
+            PrimitiveDataType<uint64_t>(val) {
+        ai_assert(val != 0);
+    }
+
+    ENTITY() :
+            PrimitiveDataType<uint64_t>(TypeError::ENTITY_NOT_SPECIFIED) {
+        // empty
+    }
+
+private:
+};
+
+// -------------------------------------------------------------------------------
+/** Wrap any STEP aggregate: LIST, SET, ... */
+// -------------------------------------------------------------------------------
+class LIST : public DataType {
+public:
+    // access a particular list index, throw std::range_error for wrong indices
+    std::shared_ptr<const DataType> operator[](size_t index) const {
+        return members[index];
+    }
+
+    size_t GetSize() const {
+        return members.size();
+    }
+
+public:
+    /** @see DaraType::Parse */
+    static std::shared_ptr<const EXPRESS::LIST> Parse(const char *&inout,
+            uint64_t line = SyntaxError::LINE_NOT_SPECIFIED,
+            const EXPRESS::ConversionSchema *schema = NULL);
+
+private:
+    typedef std::vector<std::shared_ptr<const DataType>> MemberList;
+    MemberList members;
+};
+
+class BINARY : public PrimitiveDataType<uint32_t> {
+public:
+    BINARY(uint32_t val) :
+            PrimitiveDataType<uint32_t>(val) {
+        // empty
+    }
+
+    BINARY() :
+            PrimitiveDataType<uint32_t>(TypeError::ENTITY_NOT_SPECIFIED_32) {
+        // empty
+    }
+};
+
+// -------------------------------------------------------------------------------
+/* Not exactly a full EXPRESS schema but rather a list of conversion functions
+         * to extract valid C++ objects out of a STEP file. Those conversion functions
+         * may, however, perform further schema validations. */
+// -------------------------------------------------------------------------------
+class ConversionSchema {
+public:
+    struct SchemaEntry {
+        SchemaEntry(const char *name, ConvertObjectProc func) :
+                mName(name), mFunc(func) {
+            // empty
+        }
+
+        const char *mName;
+        ConvertObjectProc mFunc;
+    };
+
+    typedef std::map<std::string, ConvertObjectProc> ConverterMap;
+
+    template <size_t N>
+    explicit ConversionSchema(const SchemaEntry (&schemas)[N]) {
+        *this = schemas;
+    }
+
+    ConversionSchema() {
+    }
+
+    ConvertObjectProc GetConverterProc(const std::string &name) const {
+        ConverterMap::const_iterator it = converters.find(name);
+        return it == converters.end() ? nullptr : (*it).second;
+    }
+
+    bool IsKnownToken(const std::string &name) const {
+        return converters.find(name) != converters.end();
+    }
+
+    const char *GetStaticStringForToken(const std::string &token) const {
+        ConverterMap::const_iterator it = converters.find(token);
+        return it == converters.end() ? nullptr : (*it).first.c_str();
+    }
+
+    template <size_t N>
+    const ConversionSchema &operator=(const SchemaEntry (&schemas)[N]) {
+        for (size_t i = 0; i < N; ++i) {
+            const SchemaEntry &schema = schemas[i];
+            converters[schema.mName] = schema.mFunc;
+        }
+        return *this;
+    }
+
+private:
+    ConverterMap converters;
+};
+} // namespace EXPRESS
+
+// ------------------------------------------------------------------------------
+/** Bundle all the relevant info from a STEP header, parts of which may later
+     *  be plainly dumped to the logfile, whereas others may help the caller pick an
+     *  appropriate loading strategy.*/
+// ------------------------------------------------------------------------------
+struct HeaderInfo {
+    std::string timestamp;
+    std::string app;
+    std::string fileSchema;
+};
+
+// ------------------------------------------------------------------------------
+/** Base class for all concrete object instances */
+// ------------------------------------------------------------------------------
+class Object {
+public:
+    Object(const char *classname = "unknown") :
+            id(0), classname(classname) {
+        // empty
+    }
+
+    virtual ~Object() {
+        // empty
+    }
+
+    // utilities to simplify casting to concrete types
+    template <typename T>
+    const T &To() const {
+        return dynamic_cast<const T &>(*this);
+    }
+
+    template <typename T>
+    T &To() {
+        return dynamic_cast<T &>(*this);
+    }
+
+    template <typename T>
+    const T *ToPtr() const {
+        return dynamic_cast<const T *>(this);
+    }
+
+    template <typename T>
+    T *ToPtr() {
+        return dynamic_cast<T *>(this);
+    }
+
+    uint64_t GetID() const {
+        return id;
+    }
+
+    std::string GetClassName() const {
+        return classname;
+    }
+
+    void SetID(uint64_t newval) {
+        id = newval;
+    }
+
+private:
+    uint64_t id;
+    const char *const classname;
+};
+
+template <typename T>
+size_t GenericFill(const STEP::DB &db, const EXPRESS::LIST &params, T *in);
+// (intentionally undefined)
+
+// ------------------------------------------------------------------------------
+/** CRTP shared base class for use by concrete entity implementation classes */
+// ------------------------------------------------------------------------------
+template <typename TDerived, size_t arg_count>
+struct ObjectHelper : virtual Object {
+    ObjectHelper() :
+            aux_is_derived(0) {
+        // empty
+    }
+
+    static Object *Construct(const STEP::DB &db, const EXPRESS::LIST &params) {
+        // make sure we don't leak if Fill() throws an exception
+        std::unique_ptr<TDerived> impl(new TDerived());
+
+        // GenericFill<T> is undefined so we need to have a specialization
+        const size_t num_args = GenericFill<TDerived>(db, params, &*impl);
+        (void)num_args;
+
+        // the following check is commented because it will always trigger if
+        // parts of the entities are generated with dummy wrapper code.
+        // This is currently done to reduce the size of the loader
+        // code.
+        //if (num_args != params.GetSize() && impl->GetClassName() != "NotImplemented") {
+        //  DefaultLogger::get()->debug("STEP: not all parameters consumed");
+        //}
+        return impl.release();
+    }
+
+    // note that this member always exists multiple times within the hierarchy
+    // of an individual object, so any access to it must be disambiguated.
+    std::bitset<arg_count> aux_is_derived;
+};
+
+// ------------------------------------------------------------------------------
+/** Class template used to represent OPTIONAL data members in the converted schema */
+// ------------------------------------------------------------------------------
+template <typename T>
+struct Maybe {
+    Maybe() :
+            have() {
+        // empty
+    }
+
+    explicit Maybe(const T &ptr) :
+            ptr(ptr), have(true) {
+        // empty
+    }
+
+    void flag_invalid() {
+        have = false;
+    }
+
+    void flag_valid() {
+        have = true;
+    }
+
+    bool operator!() const {
+        return !have;
+    }
+
+    operator bool() const {
+        return have;
+    }
+
+    operator const T &() const {
+        return Get();
+    }
+
+    const T &Get() const {
+        ai_assert(have);
+        return ptr;
+    }
+
+    Maybe &operator=(const T &_ptr) {
+        ptr = _ptr;
+        have = true;
+        return *this;
+    }
+
+private:
+    template <typename T2>
+    friend struct InternGenericConvert;
+
+    operator T &() {
+        return ptr;
+    }
+
+    T ptr;
+    bool have;
+};
+
+// ------------------------------------------------------------------------------
+/** A LazyObject is created when needed. Before this happens, we just keep
+       the text line that contains the object definition. */
+// -------------------------------------------------------------------------------
+class LazyObject {
+    friend class DB;
+
+public:
+    LazyObject(DB &db, uint64_t id, uint64_t line, const char *type, const char *args);
+    ~LazyObject();
+
+    Object &operator*() {
+        if (!obj) {
+            LazyInit();
+            ai_assert(obj);
+        }
+        return *obj;
+    }
+
+    const Object &operator*() const {
+        if (!obj) {
+            LazyInit();
+            ai_assert(obj);
+        }
+        return *obj;
+    }
+
+    template <typename T>
+    const T &To() const {
+        return dynamic_cast<const T &>(**this);
+    }
+
+    template <typename T>
+    T &To() {
+        return dynamic_cast<T &>(**this);
+    }
+
+    template <typename T>
+    const T *ToPtr() const {
+        return dynamic_cast<const T *>(&**this);
+    }
+
+    template <typename T>
+    T *ToPtr() {
+        return dynamic_cast<T *>(&**this);
+    }
+
+    Object *operator->() {
+        return &**this;
+    }
+
+    const Object *operator->() const {
+        return &**this;
+    }
+
+    bool operator==(const std::string &atype) const {
+        return type == atype;
+    }
+
+    bool operator!=(const std::string &atype) const {
+        return type != atype;
+    }
+
+    uint64_t GetID() const {
+        return id;
+    }
+
+private:
+    void LazyInit() const;
+
+private:
+    mutable uint64_t id;
+    const char *const type;
+    DB &db;
+    mutable const char *args;
+    mutable Object *obj;
+};
+
+template <typename T>
+inline bool operator==(const std::shared_ptr<LazyObject> &lo, T whatever) {
+    return *lo == whatever; // XXX use std::forward if we have 0x
+}
+
+template <typename T>
+inline bool operator==(const std::pair<uint64_t, std::shared_ptr<LazyObject>> &lo, T whatever) {
+    return *(lo.second) == whatever; // XXX use std::forward if we have 0x
+}
+
+// ------------------------------------------------------------------------------
+/** Class template used to represent lazily evaluated object references in the converted schema */
+// ------------------------------------------------------------------------------
+template <typename T>
+struct Lazy {
+    typedef Lazy Out;
+    Lazy(const LazyObject *obj = nullptr) :
+            obj(obj) {
+        // empty
+    }
+
+    operator const T *() const {
+        return obj->ToPtr<T>();
+    }
+
+    operator const T &() const {
+        return obj->To<T>();
+    }
+
+    const T &operator*() const {
+        return obj->To<T>();
+    }
+
+    const T *operator->() const {
+        return &obj->To<T>();
+    }
+
+    const LazyObject *obj;
+};
+
+// ------------------------------------------------------------------------------
+/** Class template used to represent LIST and SET data members in the converted schema */
+// ------------------------------------------------------------------------------
+template <typename T, uint64_t min_cnt, uint64_t max_cnt = 0uL>
+struct ListOf : public std::vector<typename T::Out> {
+    typedef typename T::Out OutScalar;
+    typedef ListOf Out;
+
+    ListOf() {
+        static_assert(min_cnt <= max_cnt || !max_cnt, "min_cnt <= max_cnt || !max_cnt");
+    }
+};
+
+// ------------------------------------------------------------------------------
+template <typename TOut>
+struct PickBaseType {
+    typedef EXPRESS::PrimitiveDataType<TOut> Type;
+};
+
+template <typename TOut>
+struct PickBaseType<Lazy<TOut>> {
+    typedef EXPRESS::ENTITY Type;
+};
+
+template <>
+struct PickBaseType<std::shared_ptr<const EXPRESS::DataType>>;
+
+// ------------------------------------------------------------------------------
+template <typename T>
+struct InternGenericConvert {
+    void operator()(T &out, const std::shared_ptr<const EXPRESS::DataType> &in, const STEP::DB & /*db*/) {
+        try {
+            out = dynamic_cast<const typename PickBaseType<T>::Type &>(*in);
+        } catch (std::bad_cast &) {
+            throw TypeError("type error reading literal field");
+        }
+    }
+};
+
+template <>
+struct InternGenericConvert<std::shared_ptr<const EXPRESS::DataType>> {
+    void operator()(std::shared_ptr<const EXPRESS::DataType> &out, const std::shared_ptr<const EXPRESS::DataType> &in, const STEP::DB & /*db*/) {
+        out = in;
+    }
+};
+
+template <typename T>
+struct InternGenericConvert<Maybe<T>> {
+    void operator()(Maybe<T> &out, const std::shared_ptr<const EXPRESS::DataType> &in, const STEP::DB &db) {
+        GenericConvert((T &)out, in, db);
+        out.flag_valid();
+    }
+};
+
+#if _MSC_VER > 1920
+#pragma warning(push)
+#pragma warning(disable : 4127)
+#endif // _WIN32
+
+template <typename T, uint64_t min_cnt, uint64_t max_cnt>
+struct InternGenericConvertList {
+    void operator()(ListOf<T, min_cnt, max_cnt> &out, const std::shared_ptr<const EXPRESS::DataType> &inp_base, const STEP::DB &db) {
+
+        const EXPRESS::LIST *inp = dynamic_cast<const EXPRESS::LIST *>(inp_base.get());
+        if (!inp) {
+            throw TypeError("type error reading aggregate");
+        }
+
+        // XXX is this really how the EXPRESS notation ([?:3],[1:3]) is intended?
+        const size_t len = inp->GetSize();
+        if (0 != max_cnt && len > max_cnt) {
+            ASSIMP_LOG_WARN("too many aggregate elements");
+        } else if (len < min_cnt) {
+            ASSIMP_LOG_WARN("too few aggregate elements");
+        }
+
+        out.reserve(inp->GetSize());
+        for (size_t i = 0; i < inp->GetSize(); ++i) {
+
+            out.push_back(typename ListOf<T, min_cnt, max_cnt>::OutScalar());
+            try {
+                GenericConvert(out.back(), (*inp)[i], db);
+            } catch (const TypeError &t) {
+                throw TypeError(t.what() + std::string(" of aggregate"));
+            }
+        }
+    }
+};
+
+template <typename T>
+struct InternGenericConvert<Lazy<T>> {
+    void operator()(Lazy<T> &out, const std::shared_ptr<const EXPRESS::DataType> &in_base, const STEP::DB &db) {
+        const EXPRESS::ENTITY *in = dynamic_cast<const EXPRESS::ENTITY *>(in_base.get());
+        if (!in) {
+            throw TypeError("type error reading entity");
+        }
+        out = Couple<T>(db).GetObject(*in);
+    }
+};
+
+template <typename T1>
+inline void GenericConvert(T1 &a, const std::shared_ptr<const EXPRESS::DataType> &b, const STEP::DB &db) {
+    return InternGenericConvert<T1>()(a, b, db);
+}
+
+template <typename T1, uint64_t N1, uint64_t N2>
+inline void GenericConvert(ListOf<T1, N1, N2> &a, const std::shared_ptr<const EXPRESS::DataType> &b, const STEP::DB &db) {
+    return InternGenericConvertList<T1, N1, N2>()(a, b, db);
+}
+
+// ------------------------------------------------------------------------------
+/** Lightweight manager class that holds the map of all objects in a
+     *  STEP file. DB's are exclusively maintained by the functions in
+     *  STEPFileReader.h*/
+// -------------------------------------------------------------------------------
+class DB {
+    friend DB *ReadFileHeader(std::shared_ptr<IOStream> stream);
+    friend void ReadFile(DB &db, const EXPRESS::ConversionSchema &scheme,
+            const char *const *types_to_track, size_t len,
+            const char *const *inverse_indices_to_track, size_t len2);
+
+    friend class LazyObject;
+
+public:
+    // objects indexed by ID - this can grow pretty large (i.e some hundred million
+    // entries), so use raw pointers to avoid *any* overhead.
+    typedef std::map<uint64_t, const LazyObject *> ObjectMap;
+
+    // objects indexed by their declarative type, but only for those that we truly want
+    typedef std::set<const LazyObject *> ObjectSet;
+    typedef std::map<std::string, ObjectSet> ObjectMapByType;
+
+    // list of types for which to keep inverse indices for all references
+    // that the respective objects keep.
+    // the list keeps pointers to strings in static storage
+    typedef std::set<const char *> InverseWhitelist;
+
+    // references - for each object id the ids of all objects which reference it
+    // this is used to simulate STEP inverse indices for selected types.
+    typedef std::step_unordered_multimap<uint64_t, uint64_t> RefMap;
+    typedef std::pair<RefMap::const_iterator, RefMap::const_iterator> RefMapRange;
+
+private:
+    DB(const std::shared_ptr<StreamReaderLE> &reader) :
+            reader(reader), splitter(*reader, true, true), evaluated_count(), schema(nullptr) {}
+
+public:
+    ~DB() {
+        for (ObjectMap::value_type &o : objects) {
+            delete o.second;
+        }
+    }
+
+    uint64_t GetObjectCount() const {
+        return objects.size();
+    }
+
+    uint64_t GetEvaluatedObjectCount() const {
+        return evaluated_count;
+    }
+
+    const HeaderInfo &GetHeader() const {
+        return header;
+    }
+
+    const EXPRESS::ConversionSchema &GetSchema() const {
+        return *schema;
+    }
+
+    const ObjectMap &GetObjects() const {
+        return objects;
+    }
+
+    const ObjectMapByType &GetObjectsByType() const {
+        return objects_bytype;
+    }
+
+    const RefMap &GetRefs() const {
+        return refs;
+    }
+
+    bool KeepInverseIndicesForType(const char *const type) const {
+        return inv_whitelist.find(type) != inv_whitelist.end();
+    }
+
+    // get the yet unevaluated object record with a given id
+    const LazyObject *GetObject(uint64_t id) const {
+        const ObjectMap::const_iterator it = objects.find(id);
+        if (it != objects.end()) {
+            return (*it).second;
+        }
+        return nullptr;
+    }
+
+    // get an arbitrary object out of the soup with the only restriction being its type.
+    const LazyObject *GetObject(const std::string &type) const {
+        const ObjectMapByType::const_iterator it = objects_bytype.find(type);
+        if (it != objects_bytype.end() && (*it).second.size()) {
+            return *(*it).second.begin();
+        }
+        return NULL;
+    }
+
+    // same, but raise an exception if the object doesn't exist and return a reference
+    const LazyObject &MustGetObject(uint64_t id) const {
+        const LazyObject *o = GetObject(id);
+        if (!o) {
+            throw TypeError("requested entity is not present", id);
+        }
+        return *o;
+    }
+
+    const LazyObject &MustGetObject(const std::string &type) const {
+        const LazyObject *o = GetObject(type);
+        if (!o) {
+            throw TypeError("requested entity of type " + type + "is not present");
+        }
+        return *o;
+    }
+
+#ifdef ASSIMP_IFC_TEST
+
+    // evaluate *all* entities in the file. this is a power test for the loader
+    void EvaluateAll() {
+        for (ObjectMap::value_type &e : objects) {
+            **e.second;
+        }
+        ai_assert(evaluated_count == objects.size());
+    }
+
+#endif
+
+private:
+    // full access only offered to close friends - they should
+    // use the provided getters rather than messing around with
+    // the members directly.
+    LineSplitter &GetSplitter() {
+        return splitter;
+    }
+
+    void InternInsert(const LazyObject *lz) {
+        objects[lz->GetID()] = lz;
+
+        const ObjectMapByType::iterator it = objects_bytype.find(lz->type);
+        if (it != objects_bytype.end()) {
+            (*it).second.insert(lz);
+        }
+    }
+
+    void SetSchema(const EXPRESS::ConversionSchema &_schema) {
+        schema = &_schema;
+    }
+
+    void SetTypesToTrack(const char *const *types, size_t N) {
+        for (size_t i = 0; i < N; ++i) {
+            objects_bytype[types[i]] = ObjectSet();
+        }
+    }
+
+    void SetInverseIndicesToTrack(const char *const *types, size_t N) {
+        for (size_t i = 0; i < N; ++i) {
+            const char *const sz = schema->GetStaticStringForToken(types[i]);
+            ai_assert(sz);
+            inv_whitelist.insert(sz);
+        }
+    }
+
+    HeaderInfo &GetHeader() {
+        return header;
+    }
+
+    void MarkRef(uint64_t who, uint64_t by_whom) {
+        refs.insert(std::make_pair(who, by_whom));
+    }
+
+private:
+    HeaderInfo header;
+    ObjectMap objects;
+    ObjectMapByType objects_bytype;
+    RefMap refs;
+    InverseWhitelist inv_whitelist;
+    std::shared_ptr<StreamReaderLE> reader;
+    LineSplitter splitter;
+    uint64_t evaluated_count;
+    const EXPRESS::ConversionSchema *schema;
+};
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif // _MSC_VER
+
+} // namespace STEP
+
+} // namespace Assimp
+
+#endif // INCLUDED_AI_STEPFILE_H
diff --git a/libs/assimp/code/AssetLib/Step/StepExporter.cpp b/libs/assimp/code/AssetLib/Step/StepExporter.cpp
new file mode 100644
index 0000000..e13c9ed
--- /dev/null
+++ b/libs/assimp/code/AssetLib/Step/StepExporter.cpp
@@ -0,0 +1,411 @@
+/*
+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.
+
+@author: Richard Steffen, 2015
+----------------------------------------------------------------------
+*/
+
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+#ifndef ASSIMP_BUILD_NO_STEP_EXPORTER
+
+#include "AssetLib/Step/StepExporter.h"
+#include "PostProcessing/ConvertToLHProcess.h"
+
+#include <assimp/Bitmap.h>
+#include <assimp/BaseImporter.h>
+#include <assimp/fast_atof.h>
+#include <assimp/SceneCombiner.h>
+#include <assimp/Exceptional.h>
+#include <assimp/DefaultIOSystem.h>
+#include <assimp/IOSystem.hpp>
+#include <assimp/scene.h>
+#include <assimp/light.h>
+
+#include <iostream>
+#include <ctime>
+#include <set>
+#include <map>
+#include <list>
+#include <memory>
+
+//
+#if _MSC_VER > 1500 || (defined __GNUC___)
+#   define ASSIMP_STEP_USE_UNORDERED_MULTIMAP
+#   else
+#   define step_unordered_map map
+#   define step_unordered_multimap multimap
+#endif
+
+#ifdef ASSIMP_STEP_USE_UNORDERED_MULTIMAP
+#   include <unordered_map>
+#   if defined(_MSC_VER) && _MSC_VER <= 1600
+#       define step_unordered_map tr1::unordered_map
+#       define step_unordered_multimap tr1::unordered_multimap
+#   else
+#       define step_unordered_map unordered_map
+#       define step_unordered_multimap unordered_multimap
+#   endif
+#endif
+
+typedef std::step_unordered_map<aiVector3D*, int> VectorIndexUMap;
+
+/* Tested with Step viewer v4 from www.ida-step.net */
+
+using namespace Assimp;
+
+namespace Assimp
+{
+
+// ------------------------------------------------------------------------------------------------
+// Worker function for exporting a scene to Collada. Prototyped and registered in Exporter.cpp
+void ExportSceneStep(const char* pFile,IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* pProperties)
+{
+    std::string path = DefaultIOSystem::absolutePath(std::string(pFile));
+    std::string file = DefaultIOSystem::completeBaseName(std::string(pFile));
+
+    // create/copy Properties
+    ExportProperties props(*pProperties);
+
+    // invoke the exporter
+    StepExporter iDoTheExportThing( pScene, pIOSystem, path, file, &props);
+
+    // we're still here - export successfully completed. Write result to the given IOSYstem
+    std::unique_ptr<IOStream> outfile (pIOSystem->Open(pFile,"wt"));
+    if (outfile == nullptr) {
+        throw DeadlyExportError("could not open output .stp file: " + std::string(pFile));
+    }
+
+    // XXX maybe use a small wrapper around IOStream that behaves like std::stringstream in order to avoid the extra copy.
+    outfile->Write( iDoTheExportThing.mOutput.str().c_str(), static_cast<size_t>(iDoTheExportThing.mOutput.tellp()),1);
+}
+
+} // end of namespace Assimp
+
+
+namespace {
+    // Collect world transformations for each node
+    void CollectTrafos(const aiNode* node, std::map<const aiNode*, aiMatrix4x4>& trafos) {
+        const aiMatrix4x4& parent = node->mParent ? trafos[node->mParent] : aiMatrix4x4();
+        trafos[node] = parent * node->mTransformation;
+        for (unsigned int i = 0; i < node->mNumChildren; ++i) {
+            CollectTrafos(node->mChildren[i], trafos);
+        }
+    }
+
+    // Generate a flat list of the meshes (by index) assigned to each node
+    void CollectMeshes(const aiNode* node, std::multimap<const aiNode*, unsigned int>& meshes) {
+        for (unsigned int i = 0; i < node->mNumMeshes; ++i) {
+            meshes.insert(std::make_pair(node, node->mMeshes[i]));
+        }
+        for (unsigned int i = 0; i < node->mNumChildren; ++i) {
+            CollectMeshes(node->mChildren[i], meshes);
+        }
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Constructor for a specific scene to export
+StepExporter::StepExporter(const aiScene* pScene, IOSystem* pIOSystem, const std::string& path,
+    const std::string& file, const ExportProperties* pProperties) :
+    mProperties(pProperties), mIOSystem(pIOSystem), mFile(file), mPath(path),
+    mScene(pScene), endstr(";\n") {
+    CollectTrafos(pScene->mRootNode, trafos);
+    CollectMeshes(pScene->mRootNode, meshes);
+
+    // make sure that all formatting happens using the standard, C locale and not the user's current locale
+    mOutput.imbue(std::locale("C"));
+    mOutput.precision(ASSIMP_AI_REAL_TEXT_PRECISION);
+
+    // start writing
+    WriteFile();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Starts writing the contents
+void StepExporter::WriteFile()
+{
+    // see http://shodhganga.inflibnet.ac.in:8080/jspui/bitstream/10603/14116/11/11_chapter%203.pdf
+    // note, that all realnumber values must be comma separated in x files
+    mOutput.setf(std::ios::fixed);
+    // precision for double
+    // see http://stackoverflow.com/questions/554063/how-do-i-print-a-double-value-with-full-precision-using-cout
+    mOutput.precision(ASSIMP_AI_REAL_TEXT_PRECISION);
+
+    // standard color
+    aiColor4D fColor;
+    fColor.r = 0.8f;
+    fColor.g = 0.8f;
+    fColor.b = 0.8f;
+
+    int ind = 100; // the start index to be used
+    std::vector<int> faceEntryLen; // numbers of entries for a triangle/face
+    // prepare unique (count triangles and vertices)
+
+    VectorIndexUMap uniqueVerts; // use a map to reduce find complexity to log(n)
+    VectorIndexUMap::iterator it;
+
+    for (unsigned int i=0; i<mScene->mNumMeshes; ++i)
+    {
+        aiMesh* mesh = mScene->mMeshes[i];
+        for (unsigned int j=0; j<mesh->mNumFaces; ++j)
+        {
+            aiFace* face = &(mesh->mFaces[j]);
+
+            if (face->mNumIndices >= 3) faceEntryLen.push_back(15 + 5 * face->mNumIndices);
+        }
+        for (unsigned int j=0; j<mesh->mNumVertices; ++j)
+        {
+            aiVector3D* v = &(mesh->mVertices[j]);
+            it =uniqueVerts.find(v);
+            if (it == uniqueVerts.end())
+            {
+                uniqueVerts[v] = -1; // first mark the vector as not transformed
+            }
+        }
+    }
+
+    static const unsigned int date_nb_chars = 20;
+    char date_str[date_nb_chars];
+    std::time_t date = std::time(nullptr);
+    std::strftime(date_str, date_nb_chars, "%Y-%m-%dT%H:%M:%S", std::localtime(&date));
+
+    // write the header
+    mOutput << "ISO-10303-21" << endstr;
+    mOutput << "HEADER" << endstr;
+    mOutput << "FILE_DESCRIPTION(('STEP AP214'),'1')" << endstr;
+    mOutput << "FILE_NAME('" << mFile << ".stp','" << date_str << "',(' '),(' '),'Spatial InterOp 3D',' ',' ')" << endstr;
+    mOutput << "FILE_SCHEMA(('automotive_design'))" << endstr;
+    mOutput << "ENDSEC" << endstr;
+
+    // write the top of data
+    mOutput << "DATA" << endstr;
+    mOutput << "#1=MECHANICAL_DESIGN_GEOMETRIC_PRESENTATION_REPRESENTATION(' ',(";
+    size_t countFace = faceEntryLen.size();
+    size_t faceLenIndex = ind + 2 * uniqueVerts.size();
+    for (size_t i=0; i<countFace; ++i)
+    {
+        mOutput << "#" << faceLenIndex;
+        if (i!=countFace-1) mOutput << ",";
+        faceLenIndex += faceEntryLen[i];
+    }
+    mOutput << "),#6)" << endstr;
+
+    mOutput << "#2=PRODUCT_DEFINITION_CONTEXT('',#7,'design')" << endstr;
+    mOutput << "#3=APPLICATION_PROTOCOL_DEFINITION('INTERNATIONAL STANDARD','automotive_design',1994,#7)" << endstr;
+    mOutput << "#4=PRODUCT_CATEGORY_RELATIONSHIP('NONE','NONE',#8,#9)" << endstr;
+    mOutput << "#5=SHAPE_DEFINITION_REPRESENTATION(#10,#11)" << endstr;
+    mOutput << "#6= (GEOMETRIC_REPRESENTATION_CONTEXT(3)GLOBAL_UNCERTAINTY_ASSIGNED_CONTEXT((#12))GLOBAL_UNIT_ASSIGNED_CONTEXT((#13,#14,#15))REPRESENTATION_CONTEXT('NONE','WORKSPACE'))" << endstr;
+    mOutput << "#7=APPLICATION_CONTEXT(' ')" << endstr;
+    mOutput << "#8=PRODUCT_CATEGORY('part','NONE')" << endstr;
+    mOutput << "#9=PRODUCT_RELATED_PRODUCT_CATEGORY('detail',' ',(#17))" << endstr;
+    mOutput << "#10=PRODUCT_DEFINITION_SHAPE('NONE','NONE',#18)" << endstr;
+    mOutput << "#11=MANIFOLD_SURFACE_SHAPE_REPRESENTATION('Root',(#16,#19),#6)" << endstr;
+    mOutput << "#12=UNCERTAINTY_MEASURE_WITH_UNIT(LENGTH_MEASURE(1.0E-006),#13,'','')" << endstr;
+    mOutput << "#13=(CONVERSION_BASED_UNIT('METRE',#20)LENGTH_UNIT()NAMED_UNIT(#21))" << endstr;
+    mOutput << "#14=(NAMED_UNIT(#22)PLANE_ANGLE_UNIT()SI_UNIT($,.RADIAN.))" << endstr;
+    mOutput << "#15=(NAMED_UNIT(#22)SOLID_ANGLE_UNIT()SI_UNIT($,.STERADIAN.))" << endstr;
+    mOutput << "#16=SHELL_BASED_SURFACE_MODEL('Root',(#29))" << endstr;
+    mOutput << "#17=PRODUCT('Root','Root','Root',(#23))" << endstr;
+    mOutput << "#18=PRODUCT_DEFINITION('NONE','NONE',#24,#2)" << endstr;
+    mOutput << "#19=AXIS2_PLACEMENT_3D('',#25,#26,#27)" << endstr;
+    mOutput << "#20=LENGTH_MEASURE_WITH_UNIT(LENGTH_MEASURE(1.0),#28)" << endstr;
+    mOutput << "#21=DIMENSIONAL_EXPONENTS(1.0,0.0,0.0,0.0,0.0,0.0,0.0)" << endstr;
+    mOutput << "#22=DIMENSIONAL_EXPONENTS(0.0,0.0,0.0,0.0,0.0,0.0,0.0)" << endstr;
+    mOutput << "#23=PRODUCT_CONTEXT('',#7,'mechanical')" << endstr;
+    mOutput << "#24=PRODUCT_DEFINITION_FORMATION_WITH_SPECIFIED_SOURCE(' ','NONE',#17,.NOT_KNOWN.)" << endstr;
+    mOutput << "#25=CARTESIAN_POINT('',(0.0,0.0,0.0))" << endstr;
+    mOutput << "#26=DIRECTION('',(0.0,0.0,1.0))" << endstr;
+    mOutput << "#27=DIRECTION('',(1.0,0.0,0.0))" << endstr;
+    mOutput << "#28= (NAMED_UNIT(#21)LENGTH_UNIT()SI_UNIT(.MILLI.,.METRE.))" << endstr;
+    mOutput << "#29=CLOSED_SHELL('',(";
+    faceLenIndex = ind + 2 * uniqueVerts.size() + 8;
+    for (size_t i=0; i<countFace; ++i)
+    {
+        mOutput << "#" << faceLenIndex;
+        if (i!=countFace-1) mOutput << ",";
+        faceLenIndex += faceEntryLen[i];
+    }
+    mOutput << "))" << endstr;
+
+    // write all the unique transformed CARTESIAN and VERTEX
+    for (MeshesByNodeMap::const_iterator it2 = meshes.begin(); it2 != meshes.end(); ++it2)
+    {
+        const aiNode& node = *(*it2).first;
+        unsigned int mesh_idx = (*it2).second;
+
+        const aiMesh* mesh = mScene->mMeshes[mesh_idx];
+        aiMatrix4x4& trafo = trafos[&node];
+        for (unsigned int i = 0; i < mesh->mNumVertices; ++i)
+        {
+            aiVector3D* v = &(mesh->mVertices[i]);
+            it = uniqueVerts.find(v);
+            if (it->second >=0 ) continue;
+            it->second = ind; // this one is new, so set the index (ind)
+            aiVector3D vt = trafo * (*v); // transform the coordinate
+            mOutput << "#" << it->second << "=CARTESIAN_POINT('',(" << vt.x << "," << vt.y << "," << vt.z << "))" << endstr;
+            mOutput << "#" << it->second+1 << "=VERTEX_POINT('',#" << it->second << ")" << endstr;
+            ind += 2;
+        }
+    }
+
+    // write the triangles
+    for (unsigned int i=0; i<mScene->mNumMeshes; ++i)
+    {
+        aiMesh* mesh = mScene->mMeshes[i];
+        for (unsigned int j=0; j<mesh->mNumFaces; ++j)
+        {
+            aiFace* face = &(mesh->mFaces[j]);
+
+            const int numIndices = face->mNumIndices;
+            if (numIndices < 3) continue;
+
+            std::vector<int> pidArray(numIndices, -1); // vertex id
+            std::vector<aiVector3D> dvArray(numIndices); // edge dir
+            for (int k = 0; k < numIndices; ++k)
+            {
+                aiVector3D *v1 = &(mesh->mVertices[face->mIndices[k]]);
+                pidArray[k] = uniqueVerts.find(v1)->second;
+
+                aiVector3D *v2 = nullptr;
+                if (k + 1 == numIndices)
+                    v2 = &(mesh->mVertices[face->mIndices[0]]);
+                else
+                    v2 = &(mesh->mVertices[face->mIndices[k + 1]]);
+                dvArray[k] = *v2 - *v1;
+                dvArray[k].Normalize();
+            }
+
+            aiVector3D dvY = dvArray[1];
+            aiVector3D dvX = dvY ^ dvArray[0];
+            dvX.Normalize();
+
+            // mean vertex color for the face if available
+            if (mesh->HasVertexColors(0))
+            {
+                fColor.r = 0.0;
+                fColor.g = 0.0;
+                fColor.b = 0.0;
+                fColor += mesh->mColors[0][face->mIndices[0]];
+                fColor += mesh->mColors[0][face->mIndices[1]];
+                fColor += mesh->mColors[0][face->mIndices[2]];
+                fColor /= 3.0f;
+            }
+
+            int sid = ind; // the sub index
+            mOutput << "#" << sid << "=STYLED_ITEM('',(#" << sid+1 << "),#" << sid+8 << ")" << endstr; /* the item that must be referenced in #1 */
+            /* This is the color information of the Triangle */
+            mOutput << "#" << sid+1 << "=PRESENTATION_STYLE_ASSIGNMENT((#" << sid+2 << "))" << endstr;
+            mOutput << "#" << sid+2 << "=SURFACE_STYLE_USAGE(.BOTH.,#" << sid+3 << ")" << endstr;
+            mOutput << "#" << sid+3 << "=SURFACE_SIDE_STYLE('',(#" << sid+4 << "))" << endstr;
+            mOutput << "#" << sid+4 << "=SURFACE_STYLE_FILL_AREA(#" << sid+5 << ")" << endstr;
+            mOutput << "#" << sid+5 << "=FILL_AREA_STYLE('',(#" << sid+6 << "))" << endstr;
+            mOutput << "#" << sid+6 << "=FILL_AREA_STYLE_COLOUR('',#" << sid+7 << ")" << endstr;
+            mOutput << "#" << sid+7 << "=COLOUR_RGB(''," << fColor.r << "," << fColor.g << "," << fColor.b << ")" << endstr;
+
+            /* this is the geometry */
+            mOutput << "#" << sid+8 << "=FACE_SURFACE('',(#" << sid+13 << "),#" << sid+9<< ",.T.)" << endstr; /* the face that must be referenced in 29 */
+
+            /* 2 directions of the plane */
+            mOutput << "#" << sid+9 << "=PLANE('',#" << sid+10 << ")" << endstr;
+            mOutput << "#" << sid+10 << "=AXIS2_PLACEMENT_3D('',#" << pidArray[0] << ",#" << sid+11 << ",#" << sid+12 << ")" << endstr;
+
+            mOutput << "#" << sid + 11 << "=DIRECTION('',(" << dvX.x << "," << dvX.y << "," << dvX.z << "))" << endstr;
+            mOutput << "#" << sid + 12 << "=DIRECTION('',(" << dvY.x << "," << dvY.y << "," << dvY.z << "))" << endstr;
+
+            mOutput << "#" << sid+13 << "=FACE_BOUND('',#" << sid+14 << ",.T.)" << endstr;
+            mOutput << "#" << sid+14 << "=EDGE_LOOP('',(";
+            int edgeLoopStart = sid + 15;
+            for (int k = 0; k < numIndices; ++k)
+            {
+                if (k == 0)
+                    mOutput << "#";
+                else
+                    mOutput << ",#";
+                mOutput << edgeLoopStart + k;
+            }
+            mOutput << "))" << endstr;
+
+            /* edge loop  */
+            int orientedEdgesStart = edgeLoopStart + numIndices;
+            for (int k=0; k < numIndices; k++)
+            {
+                mOutput << "#" << edgeLoopStart+k << "=ORIENTED_EDGE('',*,*,#" << orientedEdgesStart + k << ",.T.)" << endstr;
+            }
+
+            /* oriented edges */
+            int lineStart = orientedEdgesStart + numIndices;
+            for (int k=0; k < numIndices; ++k)
+            {
+                if (k == 0)
+                    mOutput << "#" << orientedEdgesStart+k << "=EDGE_CURVE('',#" << pidArray[k]+1 << ",#" << pidArray[k+1]+1 << ",#" << lineStart+k << ",.F.)" << endstr;
+                else if (k+1 == numIndices)
+                    mOutput << "#" << orientedEdgesStart+k << "=EDGE_CURVE('',#" << pidArray[k]+1 << ",#" << pidArray[0]+1 << ",#" << lineStart+k << ",.T.)" << endstr;
+                else
+                    mOutput << "#" << orientedEdgesStart+k << "=EDGE_CURVE('',#" << pidArray[k]+1 << ",#" << pidArray[k+1]+1 << ",#" << lineStart+k << ",.T.)" << endstr;
+            }
+
+            /* n lines and n vectors for the lines for the n edge curves */
+            int vectorStart = lineStart + numIndices;
+            for (int k=0; k < numIndices; ++k)
+            {
+                mOutput << "#" << lineStart+k << "=LINE('',#" << pidArray[k] << ",#" << vectorStart+k << ")" << endstr;
+            }
+
+            int directionStart = vectorStart + numIndices;
+            for (int k=0; k < numIndices; ++k)
+            {
+                mOutput << "#" << vectorStart+k << "=VECTOR('',#" << directionStart+k << ",1.0)" << endstr;
+            }
+
+            for (int k=0; k < numIndices; ++k)
+            {
+                const aiVector3D &dv = dvArray[k];
+                mOutput << "#" << directionStart + k << "=DIRECTION('',(" << dv.x << "," << dv.y << "," << dv.z << "))" << endstr;
+            }
+            ind += 15 + 5*numIndices; // increase counter
+        }
+    }
+
+    mOutput << "ENDSEC" << endstr; // end of data section
+    mOutput << "END-ISO-10303-21" << endstr; // end of file
+}
+
+#endif
+#endif
diff --git a/libs/assimp/code/AssetLib/Step/StepExporter.h b/libs/assimp/code/AssetLib/Step/StepExporter.h
new file mode 100644
index 0000000..a022626
--- /dev/null
+++ b/libs/assimp/code/AssetLib/Step/StepExporter.h
@@ -0,0 +1,111 @@
+/*
+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.
+
+@author: Richard Steffen, 2014
+
+----------------------------------------------------------------------
+*/
+
+/** @file StepExporter.h
+ * Declares the exporter class to write a scene to a Collada file
+ */
+#ifndef AI_STEPEXPORTER_H_INC
+#define AI_STEPEXPORTER_H_INC
+
+#include <assimp/ai_assert.h>
+#include <assimp/matrix4x4.h>
+#include <assimp/Exporter.hpp>
+#include <sstream>
+
+
+struct aiScene;
+struct aiNode;
+
+namespace Assimp
+{
+
+/// Helper class to export a given scene to a StepFile.
+/// Note: an StepFile uses a left hand system. Assimp used a right hand system (OpenGL), therefore we have to transform everything
+class StepExporter
+{
+public:
+    /// Constructor for a specific scene to export
+    StepExporter(const aiScene* pScene, IOSystem* pIOSystem, const std::string& path, const std::string& file, const ExportProperties* pProperties);
+
+protected:
+    /// Starts writing the contents
+    void WriteFile();
+
+public:
+
+    /// Stringstream to write all output into
+    std::stringstream mOutput;
+
+protected:
+
+    /// hold the properties pointer
+    const ExportProperties* mProperties;
+
+    /// The IOSystem for output
+    IOSystem* mIOSystem;
+
+    /// Name of the file (without extension) where the scene will be exported
+    std::string mFile;
+
+    /// Path of the directory where the scene will be exported
+    std::string mPath;
+
+    /// The scene to be written
+    const aiScene* mScene;
+
+    /// current line end string for simple stream insertion
+    std::string endstr;
+
+    /// accumultated transformations for nodes
+    std::map<const aiNode*, aiMatrix4x4> trafos;
+
+    /// map to all meshed of nodes
+    typedef std::multimap<const aiNode*, unsigned int> MeshesByNodeMap;
+    MeshesByNodeMap meshes;
+
+};
+
+}
+
+#endif // !! AI_STEPEXPORTER_H_INC