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

[Marco Nawijn]

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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