[Paraview] pythonnurbs inside ProgrammableFilter

[Berk Geveci]

Sorry, I assumed that you had more than those few lines. OK, this is
very weird. Can you simply print what
NurbsPoint.Point3Dd(0.0,0.0,0.0)
returns the first time and the second time?


On Fri, Jan 8, 2010 at 9:49 AM, Oliver Borm <oli.borm at web.de> wrote:
> Do you mean the source code of pythonnurbs or my test code? Pythonnurbs itself is a python binding of the NURBS++ library using SWIG. This is the whole python code I'm using inside the ProgrammableFilter:
>
> from pythonnurbs import NurbsCurve, NurbsPoint
>
> curve=NurbsCurve.NurbsCurved()
> curve.makeCircle(NurbsPoint.Point3Dd(0.0,0.0,0.0), 100.0)
> u = 0.5
> print curve.pointAt(u).getx(), curve.pointAt(u).gety(), curve.pointAt(u).getz()
>
>
>
> Berk Geveci schrieb:
>> I am guessing somehow the arguments passed to makeCircle are getting
>> clobbered. Can you post you Python code?
>>
>> -berk
>>
>> On Fri, Jan 8, 2010 at 4:12 AM, Oliver Borm <oli.borm at web.de> wrote:
>>
>>> Hello,
>>>
>>> I am using pythonnurbs from http://pypi.python.org/pypi/PythonNURBS in
>>> conjunction with the python bindings from vtk. As a standalone script it
>>> works perfectly, but if I want to use it inside paraview with the
>>> ProgrammableFilter it just works once a time. After that some errors
>>> occur. Here is a simple python test code:
>>>
>>> from pythonnurbs import NurbsCurve, NurbsPoint
>>> curve=NurbsCurve.NurbsCurved()
>>> curve.makeCircle(NurbsPoint.Point3Dd(0.0,0.0,0.0), 100.0)
>>> u = 0.5
>>> print curve.pointAt(u).getx(), curve.pointAt(u).gety(),
>>> curve.pointAt(u).getz()
>>>
>>> The following output is printed:
>>>
>>> -100.0 0.0 0.0
>>>
>>>
>>> If one changes for example:
>>> u = 0.25
>>>
>>> and want to re-execute the ProgrammableFilter again, the following error
>>> occured
>>>
>>> Traceback (most recent call last):
>>>
>>> File "<string>", line 23, in <module>
>>>
>>> File "<string>", line 5, in RequestData
>>>
>>> File "/usr/lib64/python2.6/site-packages/pythonnurbs/NurbsCurve.py",
>>> line 277, in makeCircle
>>>
>>> def makeCircle(*args): return _NurbsCurve.NurbsCurved_makeCircle(*args)
>>>
>>> NotImplementedError: Wrong number of arguments for overloaded function
>>> 'NurbsCurved_makeCircle'.
>>>
>>> Possible C/C++ prototypes are:
>>>
>>> makeCircle(PLib::NurbsCurve< double,3 > *,PLib::Point_nD< double,3 >
>>> const &,PLib::Point_nD< double,3 > const &,PLib::Point_nD< double,3 >
>>> const &,double,double,double)
>>>
>>> makeCircle(PLib::NurbsCurve< double,3 > *,PLib::Point_nD< double,3 >
>>> const &,double,double,double)
>>>
>>> makeCircle(PLib::NurbsCurve< double,3 > *,PLib::Point_nD< double,3 >
>>> const &,double)
>>>
>>>
>>> while running the same code a second time in a normal python shell, the
>>> output looks like the following:
>>> 0.0 100.0 0.0
>>>
>>> One has to restart paraview and the python code in the
>>> ProgrammableFilter works as expected (once a time). The error message is
>>> not very helpful, as it says that this method is not implemented in the
>>> way I'm using it. But that is not correct. Does anybody has an idea
>>> what's the real problem? At first one could expect the problem is in
>>> pythonnurbs (maybe it is, but not in the way the error message says),
>>> but as the code works once a time, why does it not works twice?
>>>
>>> Best regards,
>>> Oliver Borm
>>>
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>