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- From: David Weinstein <dmw@sci.utah.edu>
- To: Grégoire Walckiers <gregoire.walckiers@epfl.ch>
- Cc: scirun-users@sci.utah.edu
- Subject: Re: [SCIRUN-USERS] ModifyConductivities
- Date: Tue, 27 Sep 2005 15:51:56 -0600
Hi Gregoire,
There are two answers to your question:
1) For the purposed of FEM simulations, SCIRun supports Fields with
conductivity tensors stored either:
a) explicitly -- at each element, there's a Tensor (i.e. the
data is a Field<Tensor>)
b) as a look-up table -- at each element there's an integer
(Field<int>), and the Field contains a Property called
conductivity_table which is the lookup table that maps integers to
Tensors.
The SCIRun modules that set up Finite Element systems are capable of
handling both of these formats. So, often times users will use b)
since it takes up less space if you have a small number of unique
Tensors (i.e. a heterogeneous model made up of isotropic compartments).
2) Occasionally, someone will want to convert a model from format a)
to format b), or vice-versa. For example, the ShowField
visualization module requires that tensors be stored in format a).
For this purpose, we have two modules that implement converting back
and forth. Both are located in the BioPSE::Forward category --
they're called IndicesToTensors and TensorsToIndices.
Cheers.
Dave
On Sep 27, 2005, at 7:27 AM, Grégoire Walckiers wrote:
Hi all
I don't understand how to use the ModifyConductivities Module.
According to the module reference, it should have as Field Input a
field were each cell value is a int and as Matrix Input a matrix of
size N*9 where N is at least greater than the number of different
index in the Input field.
I made a net corresponding to the net in the BioFEM tutorial but
the Field Output of the ModifyConductivities is still a TetVolField
of int.
Is it possible to get in output a Field of Tensor using this module?
In the module reference, it is said that the /"The tensors are
stored as a 'conductivities' property in the input and output fields."
/How do you manage this property of the field (using SetProperty
doesn't seem to work).
thanks a lot
Gregoire
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