[vtkusers] vtkCellDerivatives

[Martin Genet]

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