[vtkusers] vtkAmoebaMinimizer

[David Gobbi]

Hi Laurent,

The cost function is an old-style C callback with a "void *" argument
that can be used to pass extra data to it.  So usually you would do
this:

amoeba->SetFunction(costfunction, data);

Then, in the cost function, you can cast the "data" to its original
pointer type.  If you are already using the void pointer for the amoeba
object, then you can make a new mini-struct that contains pointers
to both the amoeba object and the data object, and pass that as the
void pointer argument.

 - David


On Wed, Jul 20, 2011 at 8:48 AM, Laurent <l.paul at uclouvain.be> wrote:
> Hi Kevin,
>
> No, the mean normal is not enough. It was my first approach, but I need to
> minimize the angle difference between each cells normal and a vector.
> Ameoba does the job, it is perfect.
> My concern was to provide it with the data.
> To do so, I had to temporarily write out the data in a file, read it in the
> Cost Function called by the minimizer and compute the function value. It
> works but it is not elegant...
> Is there a way to pass data without writing these in a file?
>
> Laurent.
>
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