[x3d-public] file converter based on pythonocc

Andreas Plesch andreasplesch at gmail.com
Thu May 14 08:21:39 PDT 2020 

Using a more complex model surfaced a few bugs which are fixed here:

https://nbviewer.jupyter.org/github/andreasplesch/OCCToX3D/blob/e52f1372fb38294ceffa23e1bc57d29a4fd4bb92/notebooks/doc_to_scenegraph.ipynb

With that a large model like this front suspension loads. It is 30MB so it
will take a bit:

https://nbviewer.jupyter.org/github/andreasplesch/OCCToX3D/blob/e52f1372fb38294ceffa23e1bc57d29a4fd4bb92/notebooks/frontsuspension.ipynb

Press 'a' to zoom to all.

Apparently, step files can contain strange naming of model parts. The only
choice is probably to preserve as they are.

-Andreas

On Wed, May 13, 2020 at 6:52 PM Andreas Plesch <andreasplesch at gmail.com>
wrote:

> In order to avoid dependencies on external tools other than occ, and to
> allow for future enhancements such as better x3d naming, metadata or
> bounding boxes, we are working on a python only version.
>
> The notebook here adds DEF/USE and preservation of the OCC hierarchy in
> terms of a scenegraph:
>
>
> https://nbviewer.jupyter.org/github/andreasplesch/OCCToX3D/blob/5437c71b754b6d266a89796e552ac89e0978928b/notebooks/doc_to_scenegraph.ipynb
>
>
> There is a function which converts an occ document to a python data
> structure, a list of dictionaries, designed to be used for x3d purposes but
> potentially also for other scenegraphs. There is then a second function
> which tesselates and converts to x3d.
>
> The conversion is using x3d.py more extensively. It worked well. One
> observation is that a X3DfromString method for fields like MFVec3f could be
> quite useful.
>
> I will have to test the approach on a more complex assembly since I
> started to stray from just utilizing existing functionality.
>
> An update, -Andreas
>
>
> On Wed, May 6, 2020 at 5:39 PM Andreas Plesch <andreasplesch at gmail.com>
> wrote:
>
>> Here is a further update which adds edge accents through LineSets
>>
>>
>> https://nbviewer.jupyter.org/github/andreasplesch/OCCToX3D/blob/conda2/notebooks/doc_to_wire_vrml.ipynb
>>
>> Edges rendering is not natively supported by OCC but pythonocc has
>> extended functionality including edge rendering, meant for its x3dom
>> renderer.
>>
>> The x3dom renderer can be used to generate X3D but the example uses
>> the native OCC vrml export (it has more interesting def/use nodes) and
>> adds on the XML level the x3dom renderer edges.
>>
>> So this example uses now three sources for X3D: the OCC vrml export,
>> x3d.py, and pythonocc x3dom extensions, using XML as the glue.
>>
>> -Andreas
>>
>> On Wed, May 6, 2020 at 9:54 AM Andreas Plesch <andreasplesch at gmail.com>
>> wrote:
>> >
>> > We have been working on getting colors transferred to x3d as well. Here
>> is an example of a more complex assembly:
>> >
>> >
>> https://nbviewer.jupyter.org/github/andreasplesch/OCCToX3D/blob/conda2/notebooks/doc_to_vrml.ipynb
>> >
>> > This is also shows how to combine x3d.py generated X3D XML and
>> pythonocc generated vrml translated to x3d with tovrmlx3d, using python's
>> ElementTree builtin XML processing (which is basic but builtin).
>> >
>> > Just an update, -Andreas
>> >
>> > On Wed, Apr 22, 2020 at 7:22 AM Andreas Plesch <andreasplesch at gmail.com>
>> wrote:
>> >>
>> >> Just a quick update with a more complete notebook:
>> >>
>> >>
>> https://nbviewer.jupyter.org/github/andreasplesch/OCCToX3D/blob/77cda237a7055d796b48623712c0c0296d579973/notebooks/stp_to_x3d2.ipynb
>> >>
>> >> [scroll to the end]
>> >>
>> >> This demonstrates:
>> >>
>> >> - how to use pythonocc to load step files.
>> >> - how to use pythonocc to generate x3d, and vrml which uses a
>> different pathway.
>> >> - how to use view3dscene's tovrmlx3d from within python to convert
>> >> vrml to x3d xml.
>> >> - how to render x3d with x3dom in a python notebook [ note to the
>> >> future: since key presses get intercepted by the notebook, it would be
>> >> useful to add js buttons to select viewpoints ]
>> >>
>> >> I also managed to use a more standard jupyter binder approach which
>> >> only uses conda on a regular ubuntu system. This should make the
>> >> notebooks easier to transport, and apply in regular python
>> >> environments.
>> >>
>> >> -Andreas
>> >>
>> >> On Sun, Apr 19, 2020 at 9:15 PM Andreas Plesch <
>> andreasplesch at gmail.com> wrote:
>> >> >
>> >> > Thanks for the response, see below for more.
>> >> >
>> >> > On Sun, Apr 19, 2020 at 7:29 PM Don Brutzman <brutzman at nps.edu>
>> wrote:
>> >> > >
>> >> > > cooler and cooler!
>> >> > >
>> >> > > On 4/19/2020 1:54 PM, Andreas Plesch wrote:
>> >> > > > I am happy to report that the core OCCT vrml writer works fine
>> with
>> >> > > > pythonocc. It generates more optimized vrml than the pythonocc
>> x3d
>> >> > > > exporter.
>> >> > >
>> >> > > obvious statement: if the vrml exporter works well, it might be a
>> simple variation to copy/refactor the output-producing sections of that
>> code to output XML instead of WRL.
>> >> > >
>> >> > > ... reading on ...
>> >> > >
>> >> > > > I updated https://github.com/andreasplesch/OCCToX3D with
>> example vrml
>> >> > > > output, and used tovrmlx3d to convert to xml which is also
>> available
>> >> > > > in the repo.
>> >> > >
>> >> > > very pretty outputs.  is it using LineProperties to give colored
>> borders along mesh edges?
>> >> >
>> >> > There is an option to generate wireframe output in addition to what
>> >> > they call shaded shape output. The edges are IndexedLineSets but the
>> >> > Appearance does not have a LineProperties. This is something which
>> >> > x3d.py could presumably do in postprocessing.
>> >> >
>> >> > Another goal would be to add better Metadata since it should be
>> >> > possible to get those - probably prettyy easily - with pythonocc from
>> >> > the original source.
>> >> >
>> >> > > > I could add tovrmlx3d to the docker image, and then call it from
>> >> > > > python. Are there other options to convert from vrml2 to xml x3d,
>> >> > > > using python ? x_ite could do it but requires a browser.
>> >> > >
>> >> > > i suspect that Holger knows how to run x_ite headless without a
>> browser.
>> >> >
>> >> > John went with headless chrome which is an option but it seems
>> heavier
>> >> > than using castle tovrmlx3d.
>> >> >
>> >> > >
>> >> > > > Enhancing c++ OCCT itself with a x3d writer, parallel to the vrml
>> >> > > > writer is in principle possible but pretty daunting.
>> >> > >
>> >> > > this is what i was trying to express above... don't rewrite the
>> whole functionality, just look for output-producing code and put a selector
>> on those code blocks for one X3D encoding or another - .wrl for VRML97,
>> .x3dv for ClassicVRML (differs only in header line), then .x3d for XML.
>> >> >
>> >> > Yes but even with this strategy in mind it seems a major effort:
>> >> >
>> >> > mostly in:
>> >> >
>> http://git.dev.opencascade.org/gitweb/?p=occt.git;a=tree;f=src/Vrml;h=d24d7db215fb0c4f26ac73af52fe68735bf8adee;hb=master
>> >> >
>> >> > but also in:
>> >> >
>> http://git.dev.opencascade.org/gitweb/?p=occt.git;a=tree;f=src/VrmlAPI;h=bacc62597d161a9cb978386b13cb8ba8f072d6e4;hb=master
>> >> >
>> http://git.dev.opencascade.org/gitweb/?p=occt.git;a=tree;f=src/VrmlConverter;h=79507809ac27c8b4ed3674ede2c3198b06b352e1;hb=master\
>> >> >
>> http://git.dev.opencascade.org/gitweb/?p=occt.git;a=tree;f=src/VrmlData;h=18683ffff1dac6a17cd9eef9a3e37b25e642e50b;hb=master
>> >> >
>> >> > This would make x3d available to all OCCT users.
>> >> >
>> >> > Another option is to improve x3d generation by pythonocc:
>> >> >
>> >> >
>> https://github.com/tpaviot/pythonocc-core/blob/master/src/Display/WebGl/x3dom_renderer.py
>> >> > which uses
>> >> >
>> https://github.com/tpaviot/pythonocc-core/blob/master/src/Tesselator/ShapeTesselator.cpp#L427
>> >> >
>> >> > > > The pythonocc generated vrml and x3d does not include a nice
>> default
>> >> > > > viewpoint. If x3d.py would have a createX3DfromString() method,
>> it may
>> >> > > > be possible to add a viewpoint and then create xml with toXML.
>> >> > >
>> >> > > somebody with better python skills than me should write that
>> parser.  shouldn't be hard for a python guru since all of the X3D nodes
>> have Python classes with essentially the same name.
>> >> >
>> >> > Yes, I think that would make x3d.py a lot more useful. In addition a
>> >> > createVRMLfromString() would help with legacy content, and
>> conversion.
>> >> > x_ite has good parsers in js which could serve as a template for
>> >> > python parsers. titanias parsers are probably similar.
>> >> >
>> >> > > > John suggested to use the stylesheet to convert from xml to
>> Python
>> >> > > > code. Saxon is probably the only processor which can handle the
>> >> > > > stylesheet ? There is saxon-c/he which is free and has
>> apparently a
>> >> > > > python wrapper:
>> https://www.saxonica.com/saxon-c/doc/html/saxonc.html
>> >> > >
>> >> > > I'm using Saxon Home Edition jar in all of the ant files for
>> builds and regression testing.  Also embedded in X3DJSAIL.  Even checked in
>> to help builders avoid versionitis.
>> >> > >
>> >> > > Better to find and use a Python package for XSLT 2 (not 1).
>> >> >
>> >> > Agree but there seem to be no native Python packages for XSLT 2. The
>> >> > Python recommendation seems to be to use saxon he. In addition to the
>> >> > java version, there is the c version which has an official Python
>> >> > wrapper. Do you want to give it a quick try ?
>> >> >
>> >> > > We would not want to hardwire such a package into x3d.py since it
>> might collide with other uses.  am trying to fit x3d.py well in the python
>> ecology.
>> >> > >
>> >> > > meanwhile I believe there is a python incantation to check at run
>> time and load such-and-such a package (if necessary) if a specialty method
>> gets invoked.  we might also create a x3d-tools.py package for simplfying
>> addition of commonly used packages (such as XSLT or even pythonocc).
>> >> >
>> >> > pythonocc is big, since it depends on c++ occ.
>> >> >
>> >> > There is a pip package:
>> >> > https://pypi.org/project/pythonocc-core/#description
>> >> > but it has not been updated to 7.4.0, the current version.
>> >> >
>> >> > But there is also a conda package
>> >> > https://anaconda.org/pythonocc/pythonocc-core
>> >> > which is uptodate. Hm, I wonder why this is not used for the
>> binderhub
>> >> > pythonocc docker image. It is compiled from scratch in the
>> Dockerfile,
>> >> > instead. Perhaps the package does not work well.
>> >> >
>> >> > > > Did anybody try saxon-c/he with the python api ? It may work.
>> >> > > >
>> >> > > > If that is succesful, it would be probably possible to eval the
>> >> > > > resulting python code in python and get a x3d document/object.
>> This
>> >> > > > could then be manipulated with x3d.py.
>> >> > >
>> >> > > with enough coercion many things can be forced to work... but
>> cross-language solutions are notoriously difficult to port and maintain.
>> also worth noting is that 'eval()' opens up an endless security hole,
>> usually frowned upon...
>> >> >
>> >> > I do not think there would a lot of coercion sicne there is an
>> >> > official Python API for saxon.
>> >> >
>> >> > >
>> >> > > don't want to sound discouraging!  a build workflow can work even
>> if cross-language.  so those might establish initial capability, but we are
>> likely best served by seeking general Pythonic solutions when
>> possible/practical and then folding them into x3d.py itself.
>> >> >
>> >> > I agree, this should stay Python as much as possible.
>> >> >
>> >> > Cheers,  -Andreas
>> >> >
>> >> > > > So think the plan would be for now:
>> >> > > >
>> >> > > > - create a Dockerfile which includes also view3dscene for
>> tovrmlx3d
>> >> > > > - try Jupyter viola and/or appmode, there is an example with
>> upload of a file
>> >> > > > - use binder to host for now, get a viable service
>> >> > > > - try saxon-c/he python api, by installing in dockerfile and then
>> >> > > > trying it in Jupyter.
>> >> > > >
>> >> > > > -Andreas
>> >> > >
>> >> > > good luck out there!  8)
>> >> > >
>> >> > >
>> >> > > > On Sun, Apr 19, 2020 at 12:35 PM Andreas Plesch <
>> andreasplesch at gmail.com> wrote:
>> >> > > >>
>> >> > > >> OpenCascade is the only realistic, open-source option to digest
>> step
>> >> > > >> format. It is a c++ library, so there is a need for
>> backend/server
>> >> > > >> side processing. The easiest option for that is docker and
>> there is a
>> >> > > >> preconfigured, working docker image with both, a working
>> OpenCascade
>> >> > > >> installation, and the pythonocc wrapper which also adds some
>> >> > > >> functionality such as x3d export. Also, python is faster to
>> iterate
>> >> > > >> than c++, and jupyter gets you even more convenience.
>> >> > > >>
>> >> > > >> I added a small example jupyter notebook which work on top of
>> >> > > >> https://mybinder.org/v2/gh/tpaviot/pythonocc-binderhub/master
>> to
>> >> > > >> https://github.com/andreasplesch/OCCToX3D, and an example x3d
>> >> > > >> conversion as proof of concept.
>> >> > > >>
>> >> > > >> I also discovered that OpenCascade supports generally
>> compilation to
>> >> > > >> wasm using emscripten. So longer term it may be possible to
>> compile
>> >> > > >> the OCC libraries required for loading, triangulation and
>> exporting
>> >> > > >> (to VRML) to wasm/ecmascript, and get a completely client based
>> >> > > >> solution. However, the content typically is large and complex,
>> and
>> >> > > >> there is a lot of computation involved. So in practice it may
>> not work
>> >> > > >> out. A main advantage would be that users would not have to
>> trust a
>> >> > > >> remote server with their valuable content.
>> >> > > >>
>> >> > > >> I think next I will try for a bit if is feasible to use the OCC
>> VRML
>> >> > > >> writer, rather than the relatively simple pythonocc x3d
>> exporter. The
>> >> > > >> python wrapper seems to exist but I do not think there is an
>> example.
>> >> > > >>
>> >> > > >> -Andreas
>> >> > > >>
>> >> > > >> On Sat, Apr 18, 2020 at 9:47 PM John Carlson <
>> yottzumm at gmail.com> wrote:
>> >> > > >>>
>> >> > > >>> X3DJSAIL has
>> www.web3d.org/x3d/stylesheets/java/src/org/web3d/x3d/jsail/X3DLoaderDOM.java
>> which supports DOM scenegraphs.
>> >> > > >>>
>> >> > > >>> Examples of usage are here:
>> >> > > >>>
>> >> > > >>> www.web3d.org/x3d/stylesheets/java/nashorn/examples/Json.js
>> >> > > >>> www.web3d.org/x3d/stylesheets/java/nashorn/examples/Nashorn.js
>> >> > > >>> www.web3d.org/x3d/stylesheets/java/nashorn/examples/X3d.js
>> >> > > >>>
>> >> > > >>> Basically, the examples parse JSON into a document using
>> X3DJSONLD.java then convert DOM into a X3DJSAIL scenegraph.
>> >> > > >>>
>> >> > > >>> So to answer your createX3DFromString() question, if you start
>> with JSON, I think you could get a X3DJSAIL scenegraph from a JSON string
>> using the X3DJSAIL-like python API (the one we got to work with Jupyter).
>> >> > > >>>
>> >> > > >>> Otherwise, you probably have to wait for enhancements to
>> x3d.py.  It looks like toXML is supported in x3d.py currently.  One could
>> use a stylesheet X3dToPython.xslt to convert XML to Python.
>> >> > > >>>
>> >> > > >>> So one could use the stylesheet in a web program (GL with
>> that!) to output python.  Then you would have to use something like eval
>> (ugh!).
>> >> > > >>>
>> >> > > >>> John
>> >> > > >>>
>> >> > > >>>
>> >> > > >>>
>> >> > > >>>
>> >> > > >>> On Sat, Apr 18, 2020 at 5:20 PM Andreas Plesch <
>> andreasplesch at gmail.com> wrote:
>> >> > > >>>>
>> >> > > >>>> Thanks for the interest. I initialized a project at
>> >> > > >>>>
>> >> > > >>>> https://github.com/andreasplesch/OCCToX3D
>> >> > > >>>>
>> >> > > >>>> The wiki has some collected info and a short outline. The
>> wiki is
>> >> > > >>>> editable by anyone.
>> >> > > >>>>
>> >> > > >>>> pythonocc has a method to generate X3D xml. It is a simple
>> Shape with
>> >> > > >>>> a TriangleSet, nothing sophisticated. If x3d.py would have  a
>> >> > > >>>> createX3DFromString() function, it would be possible to use
>> x3d.py to
>> >> > > >>>> enhance the generated X3D. But I do not think x3d.py has
>> that. But
>> >> > > >>>> x3d.py may come in handy in other ways.
>> >> > > >>>>
>> >> > > >>>> The first goal is to add a simple jupyter notebook to the
>> repo based
>> >> > > >>>> on the available pythonocc docker image which demonstrate how
>> to load
>> >> > > >>>> step and output X3D.
>> >> > > >>>>
>> >> > > >>>> Any feedback or ideas welcome, using Issues on the project or
>> here,
>> >> > > >>>>
>> >> > > >>>> -Andreas
>> >> > > >>>>
>> >> > > >>>>
>> >> > > >>>>
>> >> > > >>>>
>> >> > > >>>> On Sat, Apr 18, 2020 at 1:27 PM Don Brutzman <
>> brutzman at nps.edu> wrote:
>> >> > > >>>>>
>> >> > > >>>>> Hi Andreas, sounds like a great idea to me.  Here are some
>> peripheral points of support.
>> >> > > >>>>>
>> >> > > >>>>> Last weekend i updated and deployed the x3d.py package
>> (sometimes called X3DPSAIL) at
>> >> > > >>>>>
>> >> > > >>>>> [1]     Python Package Index (PyPi) x3d 0.0.25
>> >> > > >>>>>          Package support for Extensible 3D (X3D) Graphics
>> International Standard (IS)
>> >> > > >>>>>          https://pypi.org/project/x3d/
>> >> > > >>>>>
>> >> > > >>>>> [2]     Python X3D Package x3d.py,X3D Python Scene Access
>> Interface Library (X3DPSAIL)
>> >> > > >>>>>
>> https://www.web3d.org/x3d/stylesheets/python/python.html
>> >> > > >>>>>
>> >> > > >>>>> "The x3d.py Python X3D Package supports programmers with
>> Python interfaces and objects for standards-based X3D programming, all as
>> open source.
>> >> > > >>>>> The presentation *Python X3D Package Implementation*
>> provides an overview and shows examples."
>> >> > > >>>>>
>> >> > > >>>>> [2.1]   Python X3D Package Implementation
>> >> > > >>>>>
>> https://www.web3d.org/x3d/stylesheets/python/documents/PythonX3dPackageImplementation.pdf
>> >> > > >>>>>
>> >> > > >>>>> So you would use this library for model creation and
>> data-driven improvement, no need to reinvent X3D data structures or methods.
>> >> > > >>>>>
>> >> > > >>>>> This is autogenerated from X3DUOM so it will always stay in
>> sync with latest/greatest X3D4.
>> >> > > >>>>>
>> >> > > >>>>> We've done some preliminary work with Jupyter notebook,
>> listed there.  Lots of potential projects in TODO section.
>> >> > > >>>>>
>> >> > > >>>>> [2.2]   X3DPSAIL: Jupyter notebook, TODO
>> >> > > >>>>>
>> https://www.web3d.org/x3d/stylesheets/python/python.html#Jupyter
>> >> > > >>>>>
>> https://www.web3d.org/x3d/stylesheets/python/python.html#TODO
>> >> > > >>>>>
>> >> > > >>>>> For pythonocc conversion efforts, will be happy to ensure
>> that
>> >> > > >>>>> a. all improvements to API are applied,
>> >> > > >>>>> b. ensure that validation of all scene-graph inputs remains
>> rigorous,
>> >> > > >>>>> b. utility methods are added for easy use together,
>> >> > > >>>>> d. examplar conversion models are properly saved in X3D
>> Examples Archive,
>> >> > > >>>>> e. Whatever else!
>> >> > > >>>>>
>> >> > > >>>>> Looks like there is vast potential here.  Hoping folks start
>> picking it up and applying capabilities.
>> >> > > >>>>>
>> >> > > >>>>> Have fun with X3D Python!  8)
>> >> > > >>>>>
>> >> > > >>>>>
>> >> > > >>>>> On 4/17/2020 5:15 PM, Andreas Plesch wrote:
>> >> > > >>>>>> Did somebody put together an x3d converter based on
>> pythonocc ?
>> >> > > >>>>>>
>> >> > > >>>>>> Here is an example:
>> >> > > >>>>>>
>> >> > > >>>>>> https://senties-martinelli.com/software/cad-viewer
>> >> > > >>>>>>
>> >> > > >>>>>> It could convert  step, stp, igs, iges, obj and stl
>> formats. Format
>> >> > > >>>>>> import and export is only a small subset of pythonocc
>> >> > > >>>>>> (https://github.com/tpaviot/pythonocc-core) but I think
>> just making
>> >> > > >>>>>> this functionality easy to use with a dedicated converter
>> could be
>> >> > > >>>>>> really valuable.
>> >> > > >>>>>>
>> >> > > >>>>>> In the end, I think a  web service just for conversion
>> would be most useful.
>> >> > > >>>>>>
>> >> > > >>>>>> I played with the Jupyter notebook and could generate with
>> only a few lines x3d.
>> >> > > >>>>>>
>> >> > > >>>>>> And there are ways to generate a standalone webapp from a
>> notebook:
>> >> > > >>>>>>
>> https://discourse.jupyter.org/t/how-to-transform-a-jupyter-notebook-into-a-webapp/758/6
>> >> > > >>>>>>
>> >> > > >>>>>> That could be quick way to offer a web service.
>> >> > > >>>>>>
>> >> > > >>>>>> Have there been attempts of this kind ? Would there be
>> interest in a
>> >> > > >>>>>> open source github hosted project ?
>> >> > > >>>>>>
>> >> > > >>>>>> -Andreas
>> >> > > >>>>>
>> >> > > >>>>> all the best, Don
>> >> > > >>>>> --
>> >> > > >>>>> Don Brutzman  Naval Postgraduate School, Code USW/Br
>> brutzman at nps.edu
>> >> > > >>>>> Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA
>>  +1.831.656.2149
>> >> > > >>>>> X3D graphics, virtual worlds, navy robotics
>> http://faculty.nps.edu/brutzman
>> >> > > >>>>
>> >> > > >>>>
>> >> > > >>>>
>> >> > > >>>> --
>> >> > > >>>> Andreas Plesch
>> >> > > >>>> Waltham, MA 02453
>> >> > > >>>>
>> >> > > >>>> _______________________________________________
>> >> > > >>>> x3d-public mailing list
>> >> > > >>>> x3d-public at web3d.org
>> >> > > >>>> http://web3d.org/mailman/listinfo/x3d-public_web3d.org
>> >> > > >>
>> >> > > >>
>> >> > > >>
>> >> > > >> --
>> >> > > >> Andreas Plesch
>> >> > > >> Waltham, MA 02453
>> >> > > >
>> >> > > >
>> >> > > >
>> >> > > > --
>> >> > > > Andreas Plesch
>> >> > > > Waltham, MA 02453
>> >> > > >
>> >> > >
>> >> > > all the best, Don
>> >> > > --
>> >> > > Don Brutzman  Naval Postgraduate School, Code USW/Br
>> brutzman at nps.edu
>> >> > > Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA
>>  +1.831.656.2149
>> >> > > X3D graphics, virtual worlds, navy robotics
>> http://faculty.nps.edu/brutzman
>> >> >
>> >> >
>> >> >
>> >> > --
>> >> > Andreas Plesch
>> >> > Waltham, MA 02453
>> >>
>> >>
>> >>
>> >> --
>> >> Andreas Plesch
>> >> Waltham, MA 02453
>> >
>> >
>> >
>> > --
>> > Andreas Plesch
>> > Waltham, MA 02453
>>
>>
>>
>> --
>> Andreas Plesch
>> Waltham, MA 02453
>>
>
>
> --
> Andreas Plesch
> Waltham, MA 02453
>


-- 
Andreas Plesch
Waltham, MA 02453
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