[Paraview] pythonnurbs inside ProgrammableFilter

[Oliver Borm]

It just works:

~ $ pvpython
Python 2.6.4 (r264:75706, Dec  8 2009, 20:49:52)
[GCC 4.3.4] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from pythonnurbs import NurbsPoint
>>> point = NurbsPoint.Point3Dd(100.0,0.0,0.0)
>>> print point.getx()
100.0
>>> point = NurbsPoint.Point3Dd(0.0,0.0,0.0)
>>> print point.getx()
0.0
>>> print(point)
<pythonnurbs.NurbsPoint.Point3Dd; proxy of <Swig Object of type
'PlPoint3Dd *' at 0xd8c910> >
>>> point.setx(25.0)
>>> print point.getx()
25.0
>>>


Berk Geveci schrieb:
> What happens if you run this in pvpython?
>
> On Fri, Jan 8, 2010 at 10:52 AM, Oliver Borm <oli.borm at web.de> wrote:
>   
>> Ok, here the test code:
>>
>> from pythonnurbs import NurbsPoint
>>
>> point = NurbsPoint.Point3Dd(100.0,0.0,0.0)
>>
>> print(point)
>>
>> print point.getx()
>>
>>
>> first time output:
>>
>> <pythonnurbs.NurbsPoint.Point3Dd; proxy of <Swig Object of type
>> 'PlPoint3Dd *' at 0x2d37710> >
>>
>> 100.0
>>
>>
>> second time output:
>>
>> <pythonnurbs.NurbsPoint.Point3Dd; proxy of <Swig Object of type
>> 'PlPoint3Dd *' at 0x2d37710> >
>>
>>
>> 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/NurbsPoint.py",
>> line 104, in getx
>>
>> def getx(*args): return _NurbsPoint.Point3Dd_getx(*args)
>>
>> TypeError: in method 'Point3Dd_getx', argument 1 of type
>> 'PLib::Point_nD< double,3 > *'
>>
>>
>> Well if I do not access the point object, then it seems that all went
>> fine. But if I want to get any data from the point object, then I get
>> the error.
>>
>> Berk Geveci schrieb:
>>     
>>> 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
>>>>>>
>>>>>> _______________________________________________
>>>>>> Powered by www.kitware.com
>>>>>>
>>>>>> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>>>>>>
>>>>>> Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView
>>>>>>
>>>>>> Follow this link to subscribe/unsubscribe:
>>>>>> http://www.paraview.org/mailman/listinfo/paraview
>>>>>>
>>>>>>
>>>>>>
>>>>>>