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Mailing lists / fpc-pascal / 2008-12

Using OpenCASCADE 3d tools with Pascal?

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Paul Nicholls

Hi all,
I am wondering if anyone here has ever managed to use the free open-source OpenCASCADE 3d tools (www.opencascade.org) with Pascal before?

An already developed ActiveX OCX control has been developed that may work but it costs lots of money.

Cheers,
Paul.

"The plastic veneer of civilization is easily melted in the heat of the moment" - Paul Nicholls.

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Marc Santhoff
to Paul Nicholls
Paul Nicholls wrote
Hi all, I am wondering if anyone here has ever managed to use the free open-source OpenCASCADE 3d tools (www.opencascade.org) with Pascal before?

I don't think so, but I remember two facts:

The toolkit is huge, porting will be a lot of work.

And it'll be complicated or maybe impossible because it is written in C ++. IIRC there are some problems related to C++ objects in libraries and fpc.

An already developed ActiveX OCX control has been developed that may work but it costs lots of money.

IIRC there was Java binding back in version 4 of opencascade (the version I had to deal with). I'm not sure if that could be used as a guideline for adapting to object pascal, though.

HTH anyhow,
Marc

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Paul Nicholls
to Marc Santhoff

"Marc Santhoff" wrote
in message

Show quoted text 22 lines
Am Donnerstag, den 18.12.2008, 09:02 +1100 schrieb Paul Nicholls: > Hi all, > I am wondering if anyone here has ever managed to use the free > open-source OpenCASCADE 3d tools (www.opencascade.org) with Pascal > before? I don't think so, but I remember two facts: The toolkit is huge, porting will be a lot of work. And it'll be complicated or maybe impossible because it is written in C ++. IIRC there are some problems related to C++ objects in libraries and fpc. > An already developed ActiveX OCX control has been developed that may > work but it costs lots of money. IIRC there was Java binding back in version 4 of opencascade (the version I had to deal with). I'm not sure if that could be used as a guideline for adapting to object pascal, though. HTH anyhow, Marc

I was thinking more along the lines of perhaps creating a compatible dll that could be used for Pascal/Delphi, and if necessary, flattening when necessary method calls to plain functions, etc.

I'm sure this sort of thing has been done before as you can use it under Visual Basic, Java, C#, Python, Ruby.

I have seen various people create a single dll containing the OpenCASCADE routines, but I am not sure how.

One person has made

"NaroCAD, a free open source parametric modeling CAD application with C#: http://sourceforge.net/projects/narocad/. The project contains a .Net(C++/CLI) wrapper layer and also a wrapper code generator application, you can generate your own wrappers in the language you want. The OCC 6.3.0 wrappers are compiled under one assembly named OCWrappers.dll."

See the thread below
http://www.opencascade.org/org/forum/thread_14766/

cheers,
Paul

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Marc Santhoff
to Paul Nicholls
Paul Nicholls wrote 31 lines
"Marc Santhoff" wrote in message > Am Donnerstag, den 18.12.2008, 09:02 +1100 schrieb Paul Nicholls: >> Hi all, >> I am wondering if anyone here has ever managed to use the free >> open-source OpenCASCADE 3d tools (www.opencascade.org) with Pascal >> before? > > I don't think so, but I remember two facts: > > The toolkit is huge, porting will be a lot of work. > And it'll be complicated or maybe impossible because it is written in C > ++. IIRC there are some problems related to C++ objects in libraries and > fpc. >> An already developed ActiveX OCX control has been developed that may >> work but it costs lots of money. > > IIRC there was Java binding back in version 4 of opencascade (the > version I had to deal with). I'm not sure if that could be used as a > guideline for adapting to object pascal, though. > > HTH anyhow, > Marc > I was thinking more along the lines of perhaps creating a compatible dll that could be used for Pascal/Delphi, and if necessary, flattening when necessary method calls to plain functions, etc. I'm sure this sort of thing has been done before as you can use it under Visual Basic, Java, C#, Python, Ruby.

I *think* that could be doable, I'm not so sure currently if there were general problems using C++ or if it had to do with ref-counted objects, memory management, or maybe only forms and graphical objects.

Hopefully someone else can speak up here ...

Show quoted text 14 lines
I have seen various people create a single dll containing the OpenCASCADE routines, but I am not sure how. One person has made "NaroCAD, a free open source parametric modeling CAD application with C#: http://sourceforge.net/projects/narocad/. The project contains a .Net(C++/CLI) wrapper layer and also a wrapper code generator application, you can generate your own wrappers in the language you want. The OCC 6.3.0 wrappers are compiled under one assembly named OCWrappers.dll." See the thread below http://www.opencascade.org/org/forum/thread_14766/

There is FreeCAD, too. If all people starting a CAD program on sf.net would unite, that would be quite enough manpower to build a complete free CAD application in three months. ;)

Something similar, hopefully explaning what you need:

http://info.borland.com/borlandcpp/papers/bc360/

HTH,
Marc

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Paul Nicholls

"Marc Santhoff" wrote
in message
<SNIP>>> I was thinking more along the lines of perhaps creating a compatible dll

Show quoted text 38 lines
> that could be used for Pascal/Delphi, and if necessary, flattening when > necessary method calls to plain functions, etc. > > I'm sure this sort of thing has been done before as you can use it under > Visual Basic, Java, C#, Python, Ruby. I *think* that could be doable, I'm not so sure currently if there were general problems using C++ or if it had to do with ref-counted objects, memory management, or maybe only forms and graphical objects. Hopefully someone else can speak up here ... > I have seen various people create a single dll containing the OpenCASCADE > routines, but I am not sure how. > > One person has made > > "NaroCAD, a free open source parametric modeling CAD application with C#: > http://sourceforge.net/projects/narocad/. The project contains a > .Net(C++/CLI) wrapper layer and also a wrapper code generator > application, > you can generate your own wrappers in the language you want. > The OCC 6.3.0 wrappers are compiled under one assembly named > OCWrappers.dll." > > See the thread below > http://www.opencascade.org/org/forum/thread_14766/ There is FreeCAD, too. If all people starting a CAD program on sf.net would unite, that would be quite enough manpower to build a complete free CAD application in three months. ;) Something similar, hopefully explaning what you need: http://info.borland.com/borlandcpp/papers/bc360/ HTH, Marc

Hi Marc,
To be honest, I am really only interested in the 3d STEP model import/export, and how to create the underlying meshes, etc. prior to the export, and back again from the import operation.

I am hoping this will simplify things quite a bit :-)

cheers,
Paul

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