[vtkusers] vtkCellDerivatives

[Martin Genet]

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 
> <mailto: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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