Hi Jens,
Could you post the code you use to cut the shape/export to STEP with
pythonOCC? I'd like too see what the step file looks like (could be
interesting that you also attach the Abaqus step file modified).
Best Regards,
Thomas
2010/10/11 jelle feringa <jelleferi...@gmail.com>
> Hi Jens,
>
> The materials lab at the Fraunhofer must be a cool place to work!
> Happy to hear you like PythonOCC!
>
> Regarding the shell issue, I don't really get it... perhaps Thomas ( who's
> the STEP expert! ) has an idea?
> Anyway, happy you're able to generate the shapes you need!
> Still, I do think its important to be able to see what you're doing ;)
>
> Take care,
>
> -jelle
>
>
> On Mon, Oct 11, 2010 at 11:44 AM, Jens Cornelis <
> jens.corne...@iwm.fraunhofer.de> wrote:
>
>> Hi Jelle,
>>
>> thanks for your reply. At first: i work as a student research assistant
>> and i came across PyOCC just yesterday when i searched for libraries to
>> create step format files, when i realized that PyOCC is much, much more.
>> I am enrolled in a masters program for computer science and i doing the
>> programming tasks for a department focusing on materials research. It
>> is very cool and i like very much, what i have seen so far. Thanks a lot
>> for your great work!
>>
>> Actually, the file is still imported as a Shell, but not as a solid.
>> This is what the skript looks like (without diplay instructions as i
>> have no TK installed):
>> ____________
>> from OCC.Utils.Construct import *
>> from OCC.Utils.Common import *
>> from OCC.Utils.DataExchange.STEP import STEPExporter
>> from OCC.KBE.TypesLookup import *
>>
>> faces = {}
>> p1,p2,p3,p4 = gp_Pnt(0,0,0),gp_Pnt(-5,-5,-5),gp_Pnt(5,-5,-5),gp_Pnt(0,0,0)
>> faces[0] = make_face(make_polygon((p1,p2,p3,p4)))
>>
>> p1,p2,p3,p4 = gp_Pnt(0,0,0),gp_Pnt(-5,-5,-5),gp_Pnt(-5,5,-5),gp_Pnt(0,0,0)
>> faces[1] = make_face(make_polygon((p1,p2,p3,p4)))
>>
>> p1,p2,p3,p4 = gp_Pnt(0,0,0),gp_Pnt(-5,5,-5),gp_Pnt(5,5,-5),gp_Pnt(0,0,0)
>> faces[2] = make_face(make_polygon((p1,p2,p3,p4)))
>>
>> p1,p2,p3,p4 = gp_Pnt(0,0,0),gp_Pnt(5,5,-5),gp_Pnt(5,-5,-5),gp_Pnt(0,0,0)
>> faces[3] = make_face(make_polygon((p1,p2,p3,p4)))
>>
>> p1,p2,p3,p4,p5 =
>> gp_Pnt(-5,-5,-5),gp_Pnt(-5,5,-5),gp_Pnt(5,5,-5),gp_Pnt(5,-5,-5),
>> gp_Pnt(-5,-5,-5)
>>
>> poly = make_polygon([p1,p2,p3,p4,p5])
>> faces[4] = make_face(poly)
>>
>> sewing = sew_shapes(faces.values())
>> sewing = fix_shape(sewing)
>> stt = ShapeToTopology()
>> solid = make_solid(stt(sewing))
>>
>> # Export to STEP
>> my_step_exporter = STEPExporter("pyramid.stp")
>> my_step_exporter.AddShape(solid)
>> my_step_exporter.WriteFile()
>> _________
>>
>> And this is what the console says:
>> _________
>> n degenerated shapes 0
>> n deleted faces: 0
>> n free edges 0
>> n multiple edges: 0
>>
>> *******************************************************************
>> ****** Statistics on Transfer (Write) ******
>>
>> *******************************************************************
>> ****** Transfer Mode = 0 I.E. As Is ******
>> ****** Transferring Shape, ShapeType = 2
>> ******
>> ** WorkSession : Sending all data
>> Step File Name : vogon.stp(245 ents) Write Done
>> STEP transfer successful
>> ____________
>>
>> Seems as if everything worked fine. As you can see on the screenshots,
>> the pyramid is imported without any errors (except the message, that it
>> is imported as shell instead of solid).
>>
>> If i cut the Pyramid, you can see that it is hollow. Using Abaqus to
>> "Create Solid from Shell" creates a solid. This just works fine, but i
>> don't see, why it is not imported as a solid in the first step. When i
>> export the solid from Abaqus and import this file once again, it is
>> imported as solid.
>>
>> Any ideas? Maybe i still am doing something wrong. Oh, btw.: even using
>> make_polygon from OCC.Utils.Construct i have to repeat the last vertex.
>> Otherwise everything fix_shape is informing me about free edges.
>>
>> JC
>> > Hi Jens,
>> >
>> > This is probably due to the fact that your faces were not correctly
>> > oriented ( see screenshot, you see a pyramid in the fixed version ).
>> > I use "fix_shape" to produce a shape with well oriented faces.
>> > Also, I suggest you use the OCC.Utils.Construct module, saves a lot of
>> > time building geometry and produces insightful messages when things go
>> > wrong. ( make_polygon has a "closed" flag, let's you not repeat the
>> > last vertex ;)
>> >
>> > Finally, a great idea is to use the ipdb module.
>> > This way, you can just "import ipdb; ipdb.set_trace()" in your code,
>> > and you have an interactive (!!!!) viewer and terminal to step through
>> > your code. This way it super easy to see what you're doing and what's
>> > going wrong.
>> >
>> > So cool folks from the Fraunhofer are interested in pythonocc!
>> > Can I ask for what research you use PyOCC Jens?
>> > Please let us know whether this fixes the issue.
>> >
>> > Best,
>> >
>> > -jelle
>> >
>> > On Mon, Oct 11, 2010 at 9:54 AM, Jens Cornelis
>> > <jens.corne...@iwm.fraunhofer.de
>> > <mailto:jens.corne...@iwm.fraunhofer.de>> wrote:
>> >
>> > Hi,
>> >
>> > i use pythonOCC to create .stp files in order to import them in
>> > Abaqus CAE.
>> >
>> > Somehow, i seem to not manage to export my example as a solid. When
>> > importing in Abaqus, it says that it is imported as shell instead
>> > of solid.
>> >
>> > Any ideas why? What am i doing wrong?
>> >
>> > Here's the example code:
>> > ______________
>> > def make_face(p1, p2, p3, p4):
>> > poly = BRepBuilderAPI_MakePolygon()
>> > map(poly.Add, [p1,p2,p3,p4])
>> > poly.Build()
>> >
>> > wire = poly.Wire()
>> > face = BRepBuilderAPI_MakeFace(wire)
>> > return face
>> >
>> >
>> > faces = {}
>> > p1,p2,p3,p4 =
>> > gp_Pnt(0,0,0),gp_Pnt(-5,-5,-5),gp_Pnt(5,-5,-5),gp_Pnt(0,0,0)
>> > faces[0] = make_face(p1,p2,p3,p4).Shape()
>> >
>> > p1,p2,p3,p4 =
>> > gp_Pnt(0,0,0),gp_Pnt(-5,-5,-5),gp_Pnt(-5,5,-5),gp_Pnt(0,0,0)
>> > faces[1] = make_face(p1,p2,p3,p4).Shape()
>> >
>> > p1,p2,p3,p4 =
>> > gp_Pnt(0,0,0),gp_Pnt(-5,5,-5),gp_Pnt(5,5,-5),gp_Pnt(0,0,0)
>> > faces[2] = make_face(p1,p2,p3,p4).Shape()
>> >
>> > p1,p2,p3,p4 =
>> > gp_Pnt(0,0,0),gp_Pnt(5,5,-5),gp_Pnt(5,-5,-5),gp_Pnt(0,0,0)
>> > faces[3] = make_face(p1,p2,p3,p4).Shape()
>> >
>> > p1,p2,p3,p4,p5 = gp_Pnt(-5,-5,-5),gp_Pnt(-5,5,-5),gp_Pnt(5,5,-5),
>> > gp_Pnt(5,-5,-5), gp_Pnt(-5,-5,-5)
>> > poly = BRepBuilderAPI_MakePolygon()
>> > map(poly.Add, [p1,p2,p3,p4,p5])
>> > poly.Build()
>> >
>> > wire = poly.Wire()
>> > faces[4] = BRepBuilderAPI_MakeFace(wire).Shape()
>> >
>> > sewing = BRepBuilderAPI_Sewing()
>> >
>> > for i in range(5):
>> > sewing.Add(faces[i])
>> >
>> > sewing.Perform()
>> > sewed_shape = sewing.SewedShape()
>> >
>> > tds = TopoDS()
>> > solid = BRepBuilderAPI_MakeSolid(tds.Shell(sewed_shape))
>> >
>> > # Export to STEP
>> > my_step_exporter = STEPExporter("vogon.stp")
>> > my_step_exporter.SetTolerance()
>> > my_step_exporter.AddShape(solid.Solid())
>> > my_step_exporter.WriteFile()
>> > ____________
>> >
>> > Thanks a lot in advance!
>> >
>> > Cheers,
>> >
>> > JC
>> >
>> >
>> > _______________________________________________
>> > Pythonocc-users mailing list
>> > Pythonocc-users@gna.org <mailto:Pythonocc-users@gna.org>
>> > https://mail.gna.org/listinfo/pythonocc-users
>> >
>> >
>> >
>> > ------------------------------------------------------------------------
>> >
>> >
>> > ------------------------------------------------------------------------
>> >
>> > ------------------------------------------------------------------------
>> >
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>> > Pythonocc-users@gna.org
>> > https://mail.gna.org/listinfo/pythonocc-users
>>
>>
>> --
>>
>> Jens Cornelis
>> Fraunhofer-Institut fuer Werkstoffmechanik IWM
>> Woehlerstr. 11
>> 79108 Freiburg
>> Telefon +49 761 5142-280
>> Fax +49 761 5142-110
>> jens.corne...@iwm.fraunhofer.de
>> www.iwm.fraunhofer.de
>>
>>
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>>
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