[Insight-developers] Compare text (vtk) files

[Arnaud GELAS]

Hi Dan,

I have couple of questions for you, depending on your needs we can write 
something really quick:

    * Do the meshes you want to compare share the same connectivity? (I
      guess yes)
    * Do you want to allow point to have different ids?

Note that in the worst case scenario, we could use MESH or METRO to 
compare both meshes.

Arnaud



On 07/12/2010 11:10 AM, kent williams wrote:
> I think it would be worthwhile to actually compare the data that matters --
> traverse the geometric topology and compare points relative to an epsilon --
> e.g. the distance between two points that should be the same, divided by the
> volume of the bounding box of the geometry.
>
> In other words, you want two meshs to be the same, but you want to allow for
> slight numerical differences that might creep in on slightly different
> platforms.
>
> This isn't a huge program to write.  You have to know enough about the
> organization of mesh data structures to make meaningful comparisons, but if
> you're writing new code to generate meshes you are probably more
> knowledgeable than I am about the subject.
>
> It also might be generally useful for exactly this sort of regression
> testing for other mesh-based code.
>
> On 7/11/10 10:05 AM, "Dan Mueller"<dan.muel at gmail.com>  wrote:
>
>    
>> Thanks for your prompt responses! I made all the screenshots for the
>> article using paraview :P
>>
>> I was looking for something a little more automated to validate the
>> output. I mean, if I make a change to the code, the only way I can
>> verify the change is to open the 20+ vtk output files one by one in
>> paraview. That will have to do for now I guess.
>>
>> Regards, Dan
>>
>> On 11 July 2010 16:57, Bill Lorensen<bill.lorensen at gmail.com>  wrote:
>>      
>>> You should at least see if it loads into paraview...
>>>
>>>
>>> On Sun, Jul 11, 2010 at 10:53 AM, Dan Mueller<dan.muel at gmail.com>  wrote:
>>>        
>>>> Fair enough.
>>>>
>>>> I see Testing/Review/itkVTKPolyDataWriterTest01 just writes a vtk file
>>>> without validating the output either. I guess this is better than
>>>> nothing, though the test could be writing complete garbage and still
>>>> pass...
>>>>
>>>> Thanks. Dan.
>>>>
>>>> On 11 July 2010 16:40, Bill Lorensen<bill.lorensen at gmail.com>  wrote:
>>>>          
>>>>> Not that I know of. Sounds difficult to me because of file formats
>>>>> differences and floating point precision differences on different
>>>>> platforms.
>>>>>
>>>>> Bill
>>>>>
>>>>> On Sun, Jul 11, 2010 at 10:29 AM, Dan Mueller<dan.muel at gmail.com>  wrote:
>>>>>            
>>>>>> Hi Insight Developers,
>>>>>>
>>>>>> I am preparing a submission for the Insight Journal. My new filter
>>>>>> itk::CuberilleImageToMeshFilter outputs mesh (vtk) files. I want to
>>>>>> write some tests which compare the resultant text (vtk) files to
>>>>>> baseline files.
>>>>>>
>>>>>> I know of the ImageCompare tool which can be used to compare output
>>>>>> images to a baseline image. Is there a similar tool or CMake command
>>>>>> to compare output text (vtk) files to a baseline text file?
>>>>>>
>>>>>> Thanks in advance.
>>>>>>
>>>>>> Regards, Dan
>>>>>>              
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