The line 
https://code.google.com/p/ifcplusplus/source/browse/trunk/IfcPlusPlusGeometry/sr
c/ifcppgeometry/ReaderWriterIFC.h#55 causes a compile error because the 
ReaderSTEP is not included. 

Changing:

#include <ifcpp/reader/IfcPPReader.h>

to:

#include <ifcpp/reader/IfcPPReaderSTEP.h>

solves it

What steps will reproduce the problem?

using Ubuntu:
1. svn checkout
2. cd build && cmake ..


What is the expected output? What do you see instead?

Encountered error:
CMake Error at IfcPlusPlus/CMakeLists.txt:62 (ADD_LIBRARY):
  Cannot find source file:

    src/ifcpp/model/IfcPPGuid.cpp


What version of the product are you using? On what operating system?

The latest version as of now (r20), on Ubuntu 12.04



Aaaand thanks for releasing your code! :)

Dear Prof. Fabian,

I noticed that there are some problems in Carve's Boolean operation. I reported 
some issues to here:
https://code.google.com/p/carve/issues/detail?id=79


but it is not responsed for a long time. Could you please help me to take a 
look at it?

I noticed that when two models have very large size difference (for example, 
one is 0.01 meter and the other is 100 meters), the boolean operations would 
fail. Do you have any suggestion to solve this problem?


Thanks,
Tang Laoya


What steps will reproduce the problem?
1.
2.
3.

What is the expected output? What do you see instead?


What version of the product are you using? On what operating system?


Please provide any additional information below.

Where is the API Reference? I can't find the documentation about how to use 
ifcplusplus library.

1) The colour of curve3D entities are not shown in the IFC++ viewer. 

2) IFC++ viewer does not have support for point,  
RepresentationConverter::convertIfcGeometricRepresentationItem() could we add 
case for Ifcpoint?


Thanks :).

What steps will reproduce the problem?
1. Load the attached IfcOpenHouse.ifc file in IFCPlusPlusViewer
2. Turn on the back face culling 


What is the expected output? What do you see instead?

The walls with openings (?) have their normals inside out. IfcRoof, Slabs ... 
are OK (normals pointing out, not influenced by the back face culling)

What version of the product are you using? On what operating system?
r24

[deleted issue]

What steps will reproduce the problem?
1. Get 
https://github.com/yorikvanhavre/IfcOpenShell/raw/master/test/input/acad2010_obj
ects.ifc
2. Call ReaderWriterIFC::readNode(....)
3. Crash  :-/

What version of the product are you using? On what operating system?
r16, OS X 10.9, Clang

Visual C++ 2008, SP1.

\IfcPlusPlus\src\ifcpp\reader\IfcStepReader.cpp line 37.

For fixing thi serror may use the following code:

void InitIfcPPEntityEnumList()
{
    if (map_string2entity_enum.empty())
    {
        int n = sizeof(initializers_IfcPP_entity) / sizeof(initializers_IfcPP_entity[0]);
        for(int i = 0; i < n; ++i)
        {
            map_string2entity_enum.insert(initializers_IfcPP_entity[i]);
        }
    }
}

line 113:
    if( keyword.size() > 0 )
    {
        InitIfcPPEntityEnumList();

I attached a fixed IfcStepReqader.cpp file.

Best Regards, Geets Andrey.

IFC++ loading the 288-Mb IFC file has been tested on two PCs. The file can be 
found at http://download2cf.nemetschek.net/www_misc/bim/DCR-LOD_300.zip

The first PC, with 16Gb of RAM, loaded and displayed the IFC file just fine, 
and the other with 4Gb of RAM never completed the loading and got hanging with 
no error messages.

The addition (or, fixing if already present) of an error handler signalling the 
memory issue while loading is needed.

Thanks

What steps will reproduce the problem?
1. Datei FJK-Project-Final.ifc laden
2. Die Wand mit der ID #102443 sieht im IfcPlusPlusViewer falsch und im 
FZKViewer richtig aus

What is the expected output? What do you see instead?

eine korrekt getrimmte Wand

Please provide any additional information below.

es liegt wohl an der Methode RepresentationConverter::convertIfcBooleanOperand, 
weil da die (sehr große) Fläche horizontal die Wand abschneidet

Danke!

What steps will reproduce the problem?
1. Compile Carve and Ifcplusplus


What is the expected output? What do you see instead?
No errors, but I get lots of compile errors. I think you forgot a CMake 
Definition. In the CMakeLists.txt of the folders Carve, IfcPlusPlus and 
IfcPlusPlusGeometry (and SimpleViewer I guess) you have the line after finding 
boost:

add_definitions(-DCARVE_SYSTEM_BOOST)

But this is missing the HAVE_BOOST_UNORDERED_COLLECTIONS defintion. So changing 
this line to 

add_definitions(-DCARVE_SYSTEM_BOOST -DHAVE_BOOST_UNORDERED_COLLECTIONS)

solves all boost errors.

In addition, in /Carve/src/include/carve/win32.h, line 24:
#  include <carve/cbrt.h>

gives also errors, as cbrt is already defined. I guess you have to move it 
below for an older VS version, or just remove it?

Last thing, somehow the libs are not created, only the dll files. I changed all 
libraries to static and that worked, don't know yet why they are not created.

What version of the product are you using? On what operating system?
CMake 3.0, VS2013 x64

IfcPPModel * ifc_model;
ifc_model->setIfcSchemaVersion(IfcPPModel::IfcPPSchemaVersion(L"IFC2x3", IfcPPModel::IfcPPVersionEnum::IFC2X3));

void IfcPPModel::setIfcSchemaVersion( IfcPPSchemaVersion& ver )
{
    m_ifc_schema_version.m_IFC_FILE_SCHEMA = ver.m_IFC_FILE_SCHEMA.c_str(); // (§1)
    m_ifc_schema_version.m_ifc_file_schema_enum = ver.m_ifc_file_schema_enum; // (§2)
}

shared_ptr<IfcPPWriterSTEP> writer(new IfcPPWriterSTEP());
std::stringstream ss;
writer->writeModelToStream(ss, ifc_model);

From r20, the file "src/ifcpp/model/IfcPPObjects.h" includes 
"ifcpp/IfcPPTypeEnums.h" when __GNUC__ is defined, but the file cannot be found.

What steps will reproduce the problem?
Upon compiling the ifcplusplus project with visual basic 2012, I got this error:

Moc'ing IfcTreeWidget.h...
The system cannot find the path specified.



What is the expected output? What do you see instead?
The project didn't compile successfully. 

What version of the product are you using? On what operating system?
I am using qt 5.2.1 with visual studio 2012 on windows 8.1

How can we solve this problem?

Dear Developer, 

is it possible to create the webgl export with command line only given the 
ifc-File and an output-Directory?

If you need further information you can contact me: [email protected]

Regards

Stefan

What steps will reproduce the problem?
1. Load the file from Issue 17
2. Get the geometry generated as osg::Group, save as file
3. Look at the file using some other software

What is the expected output? What do you see instead?
The beams are added twice. Actually, the same node pointer is added twice, 
because when I rename one of them, the other gets renamed too.


What version of the product are you using? On what operating system?
r25, on Windows

Please provide any additional information below.
* There's a slight chance that this may be related to the cause of Issue 17. My 
guess is that when this file is loaded, both the product_shape 
(ReaderWriterIFC.cpp, Ln 505) and the product_switch_curves 
(ReaderWriterIFC.cpp, Ln 521) are valid.

The problem has been reproduced on two different PCs running MS Windows 7. Same 
fail. Also, the popup window doesn't say what point (STEP line number) the IFC 
parser failed.

IFC file attached.

Please let me know if you need more details.

Kind regards.
Ivano

Hi

I see you added the Cmake files, thank you very much. One improvement would be 
to make the SimpleViewer optional, as I integrate IFC in my CMake build process 
by EXTERNALPROJECT_ADD. So as I have my own application and don't use Qt, I 
need a way to only build the framework. The easiest would be to introduce an 
option for the viewer. This would look like this in your root CMakeLists.txt:

...
ENDIF(NOT CARVE_BINARY_DIR)
message(STATUS   
"------------------------------------------------------------------------")

OPTION(BUILD_SIMPLEVIEWER "Build the simple viewer example applilcation" ON)

add_subdirectory (Carve)
add_subdirectory (IfcPlusPlus)
add_subdirectory (IfcPlusPlusGeometry)
IF(BUILD_SIMPLEVIEWER)
    add_subdirectory (SimpleViewer)
ENDIF()

Would it be possible to integrate this (or something similar)?

Thanks for the great work

[deleted issue]

I was trying to compile the library on windows, and I think that just setting 
the environment variables according to 
https://code.google.com/p/ifcplusplus/wiki/BuildInstructions won't be enough to 
make MS VS find the libraries. Is there some official additional steps for 
building?

What steps will reproduce the problem?
1. download openscenegraph and compile with MS visual studio express 2013
2. download cgal, qt etc
3. set environment variables like 
https://code.google.com/p/ifcplusplus/wiki/BuildInstructions and run visual 
studio and build solution

What is the expected output? What do you see instead?
VS complains about not being able to find include files. I added the 
environment variables to the project properties, additional include libraries. 
But when compiling SimpleViewer it still tries to find Qt under D:\lib\... 
instead of where I specified (C:\Qt\...). I can't find where to change this.


What version of the product are you using? On what operating system?
r25, on Windows 7 with MS visual studio express 2013

Please provide any additional information below.

Hello,
The attached IFCWALLSTANDARDCASE opens correctly in Solibri Model Viewer but 
converts to a huuuge wall when using IFCPlusPlus. I guess the CSG operation to 
stamp a side of the wall (see attached picture) is not correctly handled ?
Can you provide some hints (or a fix ? :-) ) to handle this problem?
Thank you in advance !
Sylvain

What steps will reproduce the problem?
1. Opening the nice model of Digital210King:  
http://www.digital210king.org/downloader.php?file=16

What is the expected output? What do you see instead?
I attached a screenshot from Solibri showing the expected result.
Instead, a set of windows is missing (top floor), and lines are misplaced 
(popping up through the roof)

What version of the product are you using? On what operating system?
Using https://github.com/VTREEM/IFCPlusPlus2 based on revision trunk/20, on OS 
X.

What steps will reproduce the problem?
1. Open the supplied v12_extract.ifc file
2. Crash with IFCPP R27, not with R20 (R24 modified RepresentationConverter.cpp 
could be the cause?)

What is the expected output? What do you see instead?

IFCPPSimpleViewer R20 didn't crash (but didn't handle an opening), R27 crashes.

What version of the product are you using? On what operating system?

Using the github repo based on R27.

What steps will reproduce the problem?
1. convert the provided door.ifc file

What is the expected output? What do you see instead?
Solibri opens the file correctly (picture1). Instead, normals seem to be 
inverted, and the wall thickness is wrong (picture2).

What version of the product are you using? On what operating system?
I'm using https://github.com/VTREEM/IFCPlusPlus which is based on r19/SVN

What steps will reproduce the problem?
1. During Loading some IFC files.

What is the expected output? What do you see instead?
Slow performance during loading IFC files and destroying 
std::map<int, shared_ptr<IfcPPEntity>

What version of the product are you using? On what operating system?

I use old version of ifcplusplus, that doesn't support C++ 11, because the 
project using Visual C++ 2008 compiler.
Project was tested on Windows 7 x64

Please provide any additional information below.

Hi, thank you for this library!

I tried to research the performance issue of ifcpluplus library. I'm using AMD 
Code XL 1.9.

1. I replaced std::map<int, shared_ptr<IfcPPEntity> to 
boost::container::flat_map<int, shared_ptr<IfcPPEntity> >. Also, may replace to 
boost::unordered_map<int, shared_ptr<IfcPPEntity> >.

std::map and boost::container::flat_map have the identical O(1) complexity, but 
std::map have the very big cache miss and memory allocations.

2. Also for boost::shared_ptr may to add some macros.

src\ifcpp\model\shared_ptr.h:

#ifndef BOOST_SP_DISABLE_THREADS
#define BOOST_SP_DISABLE_THREADS
#endif
#ifndef BOOST_SP_USE_QUICK_ALLOCATOR
#define BOOST_SP_USE_QUICK_ALLOCATOR
#endif
#ifndef BOOST_SP_NO_ATOMIC_ACCESS
#define BOOST_SP_NO_ATOMIC_ACCESS
#endi

BOOST_SP_USE_QUICK_ALLOCATOR - using for fast allocations.
BOOST_SP_DISABLE_THREADS/BOOST_SP_NO_ATOMIC_ACCESS - if using single thread for 
loading

I attached the edited version of ifcplusplus library. You can use it for the 
future versions. Thanks!

(sorry this is not issue, but I don't see an easy way to submit patches?)

Please find a commit in 
https://github.com/VTREEM/IFCPlusPlus2/commit/d0173a55ddaf22ed6a5ec87e442f8c30a4
9bc822 to fix a regression in R27.

What steps will reproduce the problem?
1. Install Ubuntu 14.04
2. Install prerequisites for compiling ifcpluplus
3. Try to compile ifcplusplus

What is the expected output? What do you see instead?
I expect the to program to compile nicely.

Left with this qt linking problem after solving other compile stopping bugs.

Linking CXX executable ../Release/IfcPlusPlusViewer
CMakeFiles/IfcPlusPlusViewer.dir/src/IfcPlusPlusSystem.cpp.o: In function 
`IfcPlusPlusSystem::IfcPlusPlusSystem()':
IfcPlusPlusSystem.cpp:(.text+0x6fa): undefined reference to 
`ReaderWriterIFC::ReaderWriterIFC()'
IfcPlusPlusSystem.cpp:(.text+0x812): undefined reference to 
`ReaderWriterIFC::~ReaderWriterIFC()'
CMakeFiles/IfcPlusPlusViewer.dir/src/IfcPlusPlusSystem.cpp.o: In function 
`IfcPlusPlusSystem::IfcPlusPlusSystem()':
IfcPlusPlusSystem.cpp:(.text+0xb1b): undefined reference to 
`ReaderWriterIFC::ReaderWriterIFC()'
IfcPlusPlusSystem.cpp:(.text+0xc90): undefined reference to 
`ReaderWriterIFC::~ReaderWriterIFC()'
CMakeFiles/IfcPlusPlusViewer.dir/src/IfcPlusPlusSystem.cpp.o: In function 
`std::tr1::_Sp_counted_base_impl<ReaderWriterIFC*, 
std::tr1::_Sp_deleter<ReaderWriterIFC>, 
(__gnu_cxx::_Lock_policy)2>::_M_dispose()':
IfcPlusPlusSystem.cpp:(.text._ZNSt3tr121_Sp_counted_base_implIP15ReaderWriterIFC
NS_11_Sp_deleterIS1_EELN9__gnu_cxx12_Lock_policyE2EE10_M_disposeEv[_ZNSt3tr121_S
p_counted_base_implIP15ReaderWriterIFCNS_11_Sp_deleterIS1_EELN9__gnu_cxx12_Lock_
policyE2EE10_M_disposeEv]+0xe): undefined reference to 
`ReaderWriterIFC::~ReaderWriterIFC()'
CMakeFiles/IfcPlusPlusViewer.dir/src/ViewController.cpp.o: In function 
`ViewController::setViewerMode(ViewController::ViewerMode)':
ViewController.cpp:(.text+0x2a9): undefined reference to 
`GeomUtils::WireFrameModeOff(osg::Node*)'
ViewController.cpp:(.text+0x2c1): undefined reference to 
`GeomUtils::HiddenLineModeOff(osg::Group*)'
CMakeFiles/IfcPlusPlusViewer.dir/src/ViewController.cpp.o: In function 
`ViewController::ViewController()':
ViewController.cpp:(.text+0xaf6): undefined reference to 
`GeomUtils::createCoordinateAxes()'
ViewController.cpp:(.text+0xb29): undefined reference to 
`GeomUtils::createCoordinateAxesArrows()'
CMakeFiles/IfcPlusPlusViewer.dir/src/ViewController.cpp.o: In function 
`ViewController::setViewerMode(ViewController::ViewerMode)':
ViewController.cpp:(.text+0x29a): undefined reference to 
`GeomUtils::HiddenLineModeOn(osg::Group*)'
ViewController.cpp:(.text+0x2da): undefined reference to 
`GeomUtils::WireFrameModeOn(osg::Node*)'
CMakeFiles/IfcPlusPlusViewer.dir/src/cmd/CmdWriteIfcFile.cpp.o: In function 
`CmdWriteIfcFile::doCmd()':
CmdWriteIfcFile.cpp:(.text+0x408): undefined reference to 
`IfcPPModel::initFileHeader(std::string)'
CMakeFiles/IfcPlusPlusViewer.dir/src/cmd/LoadIfcFileCommand.cpp.o: In function 
`LoadIfcFileCommand::doCmd()':
LoadIfcFileCommand.cpp:(.text+0xf2): undefined reference to 
`ReaderWriterIFC::resetModel()'
LoadIfcFileCommand.cpp:(.text+0xf9): undefined reference to `carve::EPSILON'
LoadIfcFileCommand.cpp:(.text+0x121): undefined reference to `carve::EPSILON2'
LoadIfcFileCommand.cpp:(.text+0x2e3): undefined reference to 
`ReaderWriterIFC::loadModelFromFile(std::string const&)'
LoadIfcFileCommand.cpp:(.text+0x2ff): undefined reference to 
`ReaderWriterIFC::createGeometryOSG(osg::ref_ptr<osg::Switch>)'
LoadIfcFileCommand.cpp:(.text+0x41f): undefined reference to 
`ReaderWriterIFC::clearInputCache()'
LoadIfcFileCommand.cpp:(.text+0x62c): undefined reference to 
`GeomUtils::applyTranslate(osg::Group*, osg::Vec3f const&, 
std::unordered_set<osg::Geode*, int>&)'
CMakeFiles/IfcPlusPlusViewer.dir/src/gui/IfcTreeWidget.cpp.o: In function 
`resolveTreeItems(std::tr1::shared_ptr<IfcPPObject>, std::set<int, 
std::less<int>, std::allocator<int> >&)':
IfcTreeWidget.cpp:(.text+0x816): undefined reference to `typeinfo for 
IfcObjectDefinition'
IfcTreeWidget.cpp:(.text+0xb09): undefined reference to `typeinfo for 
IfcSpatialStructureElement'
IfcTreeWidget.cpp:(.text+0xb12): undefined reference to `typeinfo for 
IfcObjectDefinition'
CMakeFiles/IfcPlusPlusViewer.dir/src/gui/IfcTreeWidget.cpp.o: In function 
`IfcTreeWidget::slotModelLoadingDone()':
IfcTreeWidget.cpp:(.text+0xf61): undefined reference to 
`IfcPPModel::getIfcProject()'
CMakeFiles/IfcPlusPlusViewer.dir/src/gui/TabView.cpp.o: In function 
`TabView::TabView(IfcPlusPlusSystem*, ViewerWidget*)':
TabView.cpp:(.text+0x2a7): undefined reference to 
`GeomUtils::cullFrontBack(bool, bool, osg::StateSet*)'
CMakeFiles/IfcPlusPlusViewer.dir/src/gui/TabView.cpp.o: In function 
`TabView::slotCullFrontFaces(int)':
TabView.cpp:(.text+0xcfb): undefined reference to 
`GeomUtils::cullFrontBack(bool, bool, osg::StateSet*)'
CMakeFiles/IfcPlusPlusViewer.dir/src/gui/TabView.cpp.o: In function 
`TabView::slotCullBackFaces(int)':
TabView.cpp:(.text+0xe6b): undefined reference to 
`GeomUtils::cullFrontBack(bool, bool, osg::StateSet*)'
collect2: error: ld returned 1 exit status
make[2]: *** [Release/IfcPlusPlusViewer] Error 1
make[1]: *** [SimpleViewer/CMakeFiles/IfcPlusPlusViewer.dir/all] Error 2
make: *** [all] Error 2

What version of the product are you using? On what operating system?
Ubuntu 14.04
ifcplusplus latest

Please provide any additional information below.

Please ask if more details necessary.

Regards

In IfcTImeStamp.h

Could you please kindly change the timestamp value from int to unsigned int?

Thanks:)

        IfcTimeStamp( int value );// to unsigned int.
    int m_value;  // to unsigned int.

While the project seems to be set up to be platform independent, there are only 
Visual Studio project files available. It would make it easier for porting to 
e.g. OSX or Linux, to use CMake or qmake project files available.

What steps will reproduce the problem?
1.Launch IFC++ Viewer
2.Clic on Choose file button
3.File dialog is empty or half.

What is the expected output? What do you see instead?
It is expected to have an usable FileDialog, instead I see an empty dialog or 
half.
See last link for screenshot.

What version of the product are you using? On what operating system?
I have IFC++ compiled myself from the master branch of Bernd github : 
https://github.com/berndhahnebach/IFCPlusPlus
It have to be the R42 branch of ifc++.
My OS is Ubuntu 14.04, 64bits, Unity.

Please provide any additional information below.
The problem is exactly the same of this (as user point of view) : 
http://stackoverflow.com/questions/14991205/qt5-openfiledialog-behaves-strange-o
n-gnome3
Too bad that there is no answer.

SI unit for metric length should be valid even if there is no "IfcSIPrefix" as 
it is optional. If it is not there then unit scale factor of 1.0 should be 
valid.

In UnitConvrter.cpp in function 
void UnitConverter::setIfcProject(shared_ptr<IfcProject> project)()
{
..
..
..
if( unit_type->m_enum == IfcUnitEnum::ENUM_LENGTHUNIT )
{
    if( si_unit->m_Prefix )
   {
    ...
    ...
     length_factor_found = true;  // Move this outside of this scope
   }

  length_factor_found = true;  // Should be here
}
..
..
..
}


..
..
..
}

Hi

Would it be possible to remove the boost library from the repository? I guess a 
lot of people who use ifc++ already have a boost version, so it would be easier 
to use it as an external dependency or something like that.

Thanks
Robert

When double/float values are written to the .ifc as scientific notation seems 
to upset a few IFC viewer. For instance, DDS-CAD viewer will throw an error and 
does not show anything. 

Could we please kindly use Fixed notation instead? 

Thanks :)

void IfcPPWriterSTEP::writeModelToStream( std::stringstream& stream, 
shared_ptr<IfcPPModel> model )
{
.
.
.

    stream << std::setprecision( 15 );
    stream << std::setiosflags( std::ios::showpoint );

       stream <<  std::fixed;            // Could we add this?
.
.
.

}

What steps will reproduce the problem?
1.Create a step writer. 
2. check the .ifc file after the header there is unexpected number "16"



stream << std::ios::showpoint; // This will print out the value of the enum 
which happens to be "16"

should be 

stream << std::setiosflags(std::ios::showpoint)

I currently get an anonymized list of errors in the Read/Write IFC tab, like:

Error: convertIfcBooleanOperand problems in extrude: poly_data->points.size() 
!= 2*polygonal_boundary.size()
convertIfcBooleanOperand problems in extrude: poly_data->points.size() != 
2*polygonal_boundary.size()
convertIfcBooleanOperand problems in extrude: poly_data->points.size() != 
2*polygonal_boundary.size()
convertIfcBooleanOperand problems in extrude: poly_data->points.size() != 
2*polygonal_boundary.size()
convertIfcBooleanOperand problems in extrude: poly_data->points.size() != 
2*polygonal_boundary.size()
...

By knowing the STEP numbers, where each fail occurs, I could extract only the 
offending IFC snippets and attach them to future logs.

Thanks

What steps will reproduce the problem?
1. Under Ubuntu 12.04, compile using cmake
2. Load the attached ifc file


What is the expected output? What do you see instead?
Output is attached (Screenshot_ubuntu.png). Expected output is also attached 
(Screenshot_windows.png). It is produced by loading the same file using the 
windows version (http://www.ifcplusplus.com/download/IfcPlusPlusViewer.zip)

What version of the product are you using? On what operating system?
r23 on Ubuntu 12.04

Please provide any additional information below.

We need to load BIM model in two steps.

1) read IFC Header
2) read stream data.

Code example:

typedef std::map<int, shared_ptr<IfcPPEntity> > mapIfcPPEntity_t;
mapIfcPPEntity_t map_entity;
shared_ptr<IfcPPModel> ifc_model(new IfcPPModel);
IfcStepReader read; 
read.readStreamHeader(buffer, ifc_model); // 1)
read.readStreamData(buffer, map_entity); // 2)

After that, need to copy map_entity into ifc_model. 

mapIfcPPEntity_t::iterator it = map_entities.begin();

for(; it != map_entities.end(); ++it)
{       
    ifc_model->insertEntity(it->second);
}

Why do it? This code may be cause of a low performance loading.

I offer 2 ways to resolve this issue;

1) Add a "non const" method 
std::map<int,shared_ptr<IfcPPEntity> >& getMapIfcObjects() { return 
m_map_entities; }

Then we can use this code:

read.readStreamData(buffer, ifc_model->->getMapIfcObjects());

2) Add a new method

void IfcStepReader::readStreamData(std::string& in, shared_ptr<IfcPPModel> 
model); 

Best regards Andrey Geets