[vtkusers] vtkCellDerivatives

[Andy Bauer]

Hi Martin,

This patch makes sense. It would need a test if you want to get your
changes into VTK. The directions for contributing to VTK are at
https://gitlab.kitware.com/vtk/vtk/blob/master/Documentation/dev/git/develop.md
.

Cheers,
Andy

On Mon, Dec 28, 2015 at 5:50 PM, Martin Genet <
martin.genet at polytechnique.edu> wrote:

> Thanks Andy.
>
> What about simply adding another mode, e.g.
> SetTensorModeToComputeGreenLagrangeStrain, to the vtkCellDerivatives
> filter? Would the attached patch make sense?
>
> Martin
>
> On 28/12/2015 14:12, Andy Bauer wrote:
>
> Hi Martin,
>
> Changing the name of the SetTensorModeToComputeStrain method to something
> else would break backward compatibility which is generally avoided in VTK.
> Other options for this include deriving a class to compute non-linear
> strain from vtkCellDerivatives if it shares enough of the algorithm with
> the linearized version or maybe just creating a new filter.
>
> Cheers,
> Andy
>
> On Sat, Dec 26, 2015 at 4:36 PM, Martin Genet <
> martin.genet at polytechnique.edu> wrote:
>
>> Dear VTK users:
>>
>> I realize that the vtkCellDerivatives filter, when
>> SetTensorModeToComputeStrain is activated, returns the symmetric part of
>> the gradient of the input vector field, which is the linearized strain
>> tensor, i.e., not a proper measure of deformation when large displacements
>> are involved. Would that make sense to have two different modes,
>> SetTensorModeToComputeLinearizedStrain or
>> SetTensorModeToComputeSymmetricGradient, and SetTensorModeToComputeStrain
>> or SetTensorModeToComputeGreenLagrangeStrain? Thanks!
>>
>> Martin
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