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 From: Dana Brooks <brooks@ece.neu.edu>
 To: Jess Tate <jess@sci.utah.edu>
 Cc: Marta Nobre <marta_rnobre@hotmail.com>, "scirunusers@sci.utah.edu" <scirunusers@sci.utah.edu>
 Subject: [SCIRUNUSERS] Re: Re: integral calculation in SCIRun
 Date: Tue, 30 Apr 2013 15:39:43 0400
Marta hi,
just to add to this  if you have a FE model, with values at the
mesh vertices, then the FE basis functions might give you a better
way to integrate than just the point method Jess suggests if that is
not accurate enough  I'm not sure how to do this in SCIRun but if
you tell us that is what you need to do we can probably work
something out.
Can you perhaps tell us a little about the problem you are working
on (and where you are working on it) ?
best,
Dana Brooks
On 4/29/13 2:22 PM, Jess Tate wrote:
575AC267B5B54A38902F437CB0B9760B@sci.utah.edu"
type="cite">
Hi Marta,
There is an integrate option in the MapDataOntoElements that
will integrate data over each volume element as it maps the data
onto it. It sounds like this is not what you need, though.
I assume that you have a mesh for each structure that you are
interested in. In this case you could calculate a simple
integral by performing the product of data of each element wight
he volume of each element, then summing the resulting data. In
your case you can use the CalculateDistanceToField module to get
a value for the distance to the point of rotation, then use
ReportFieldGeometryMeasures to get the volume of each element,
and CalculateFieldData to multiply these together ( there are
other ways to do it too). You would then use GetFieldData and
ReportColumnMeasure to sum all the data together and the
resulting 1x1 matrix would be your integral. This method will
give a good value if your elements are small enough. If you are
looking for something more complex than this or something like a
finite volume solver, these aren't really implemented in SCIRun
currently.
Hopefully that helps.
cheers,
Jess
Hello,
First time user here. Is there a way to calculate
a volume integral in Scirun? We need to calculate the
inertia tensor of some anatomical segments and were
wondering if Scirun allows us to do the volume
integrals once the mesh is built.
Thanks in advance,
Marta Nobre

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