[Insight-developers] Compare text (vtk) files

[kent williams]

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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