[vtkusers] comparing data in two meshes that *nearly* match

[Bill Lorensen]

in the example, you will need to change vtkPolyDataReader to
vtkXMLPolyDataReader
I tried it on your data


On Sat, May 18, 2013 at 9:02 AM, Bill Lorensen <bill.lorensen at gmail.com>wrote:

> Take a look at this example:
> http://vtk.org/Wiki/VTK/Examples/Cxx/PolyData/DistancePolyDataFilter
>
>
>
>
> On Sat, May 18, 2013 at 8:22 AM, Marco Nawijn <nawijn at gmail.com> wrote:
>
>> Hi Seth,
>>
>> Are you aware of the vtkProbeFilter? You could use the points of one
>> mesh (the input mesh) and compute the value from the other mesh
>> at the locations of the input mesh. See documentation string below.
>>
>> Regards,
>>
>> Marco
>>
>>
>> Source: Python doc-string for vtkProbeFilter
>>
>> vtkProbeFilter is a filter that computes point attributes (e.g.,
>> scalars, vectors, etc.) at specified point positions. The filter has
>> two inputs: the Input and Source. The Input geometric structure is
>> passed through the filter. The point attributes are computed at the
>> Input point positions by interpolating into the source data. For
>> example, we can compute data values on a plane (plane specified as
>> Input) from a volume (Source). The cell data of the source data is
>> copied to the output based on in which source cell each input point
>> is. If an array of the same name exists both in source's point and
>> cell data, only the one from the point data is probed.
>>
>> This filter can be used to resample data, or convert one dataset form
>> into another. For example, an unstructured grid (vtkUnstructuredGrid)
>> can be probed with a volume (three-dimensional vtkImageData), and
>> then volume rendering techniques can be used to visualize the
>> results. Another example: a line or curve can be used to probe data
>> to produce x-y plots along that line or curve.
>>
>>
>>
>> On Fri, May 17, 2013 at 11:48 PM, Seth Gilchrist <seth at mech.ubc.ca>wrote:
>>
>>> Hello,
>>> I'm trying to compare data on two meshes that are close to matching, but
>>> don't quite match.
>>>
>>> The meshes are the surface of a bone with scalar data representing
>>> physical strain observed at a given point. The bones were measured twice
>>> under different conditions, and the two extracted surfaces are similar, but
>>> not identical.
>>>
>>> I have used ICP to align the meshes, but can't figure out a way to
>>> compare the data between the two meshes. One way would be to project the
>>> data from each mesh onto a plane image, or better to warp one mesh to the
>>> other and interpolate the data, but I can't figure that out either.
>>>
>>> So that you can see what I'm working with I've uploaded the meshes in
>>> vtp format to
>>> https://share.cfri.ca/?u=SN7q&p=9fAJ
>>>
>>> Any ideas would be much appreciated. I want to compare the strain in the
>>> meshes on a point by point basis.
>>>
>>> Thanks for your time and ideas,
>>> Seth
>>>
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>>
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>
>
> --
> Unpaid intern in BillsBasement at noware dot com
>



-- 
Unpaid intern in BillsBasement at noware dot com
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