calling the function .GetPointInformation

[lianges777]

Hello
I am currently studying plasticity in 2D woven fabric reinforced composites. In order to get a better mesh, I want to generate in Texgen only the mesh for the yarns and then mesh the matrix with ABAQUS. Therefore I run the following script in the Texgen graphical interface:


weave = CTextileWeave2D(2, 2, 0.6, 0.1, True)
weave.SetGapSize(0.001)
weave.SwapPosition(0, 1)
weave.SwapPosition(1, 0)
weave.AssignDomain(CDomainPlanes(XYZ(0, 0, 0), XYZ(1.2, 1.2, 0.1)))
textilename = AddTextile(weave)
mesh=CMesh()
weave.AddVolumeToMesh(mesh, True)
PointsInfo=[POINT_INFO()]
weave.GetPointInformation(mesh.GetNodes(), PointsInfo)
mesh.SaveToABAQUS("C:\Documents and Settings\UPM\Escritorio\weaves\plastic.inp",PointsInfo)


However I have got two error messages:
- the first one is in the texgen output and it says: "Unable to create equispaced section points, maximum iterations exceeded: Polygon(N:20)
"

-the second one is in the Python output:
Traceback (most recent call last):
File "gui", line 1, in <module>
File "C:\Documents and Settings\UPM\Escritorio\python scipts\plastic.py", line 19, in <module>
weave.GetPointInformation(mesh.GetNodes(), PointsInfo)
File ".\Python\libxtra\TexGen\Core.py", line 2094, in GetPointInformation
NotImplementedError: Wrong number of arguments for overloaded function 'CTextile_GetPointInformation'.
Possible C/C++ prototypes are:
GetPointInformation(TexGen::CTextile *,std::vector< TexGen::XYZ > const &,std::vector< TexGen::POINT_INFO > &,double)
GetPointInformation(TexGen::CTextile *,std::vector< TexGen::XYZ > const &,std::vector< TexGen::POINT_INFO > &)

Could someone explain to me why I can't call the function GetPointInformation, please?

Thank you very much

[joncrookston]

Hi Angie,

From the prototypes given it looks like your call to GetPointInformation is correct, although from a (very) quick look in the code, the functions which I saw all took another argument of a tolerance value, as in the first prototype. Try calling:

Code: Select all

tolerance = 1.0e-9
weave.GetPointInformation(mesh.GetNodes(), PointsInfo, tolerance)

Let us know how you get on.

As for the equispaced section points, I think this indicates that TexGen couldn't find a configuration of points around the yarn cross section which led to equal spacing. I think this is quite common, and probably not something to worry about, but others may comment if I'm mistaken.

Cheers,
Jon.

[lianges777]

Dear Jon,

I tried introducing a tolerance but I still have the same error message

The problem, I think, is that PointsInfo is not recognized a a Point_Info vector structure. I thought the equivalent in python of vectors were lists therefore I defined:

PointsInfo=[POINT_INFO()]

Could you please try to run the same script in your own Texgen to see if the same error message appears?

Thank you very much
Best Regards,
Angie

[joncrookston]

Yes, I see what you mean. Try this:

Code: Select all

	pointsInfo = PointInfoVector()
	print 'Passing centroids to TexGen.  Number of centroids = ', len(centroids)
	textile.GetPointInformation(coords, pointsInfo, tolerance)
	print 'done'

where coords is a list of items of type XYZ, e.g. :

Code: Select all

coords = [XYZ(0,0,0) , XYZ(1,1,0), ]

and tolerance is the tolerance for returning yarn information for a point just outside the yarn.

Hope this gets it running.
Jon.

[lianges777]

Dear Jon
I ran your script and it works
Thank you very much!

Best Regards