[Insight-developers] mesh data structure problem.

[Ting Chen]

ok, I found out the problem is in type cast. now the getpoint method is ok!
Thanks Bill.
-----Original Message-----
From: Lorensen, William E (CRD) <lorensen@crd.ge.com>
To: 'Lydia Ng' <lng@insightful.com>; Luis Ibanez <ibanez@cs.unc.edu>
Cc: insight-developers@public.kitware.com
<insight-developers@public.kitware.com>
Date: Friday, March 02, 2001 6:09 AM
Subject: RE: [Insight-developers] mesh data structure problem.


>I believe I introduced that problem when purging some signed/unsigned mis
matches.
>
>I checked in the fix.
>
>Bill
>
>
>-----Original Message-----
>From: Lydia Ng [mailto:lng@insightful.com]
>Sent: Friday, March 02, 2001 3:09 AM
>To: Luis Ibanez
>Cc: insight-developers@public.kitware.com
>Subject: Re: [Insight-developers] mesh data structure problem.
>
>
>Hi,
>
>The problem seems to be with VectorContainer::GetElementIfIndexExists()
>it thinks id = 0 is invalid and fails ( see code below ).
>
>Hence the bogus result when you call
>    mesh->GetPoint( 0, &point )
>
>Can someone from GE/Kitware look into this?
>
>Cheers,
>Lydia
>
>--------------- from itkVectorContainer.txx -------------------------
>template <typename TElementIdentifier, typename TElement>
>bool
>VectorContainer< TElementIdentifier , TElement >
>::GetElementIfIndexExists(ElementIdentifier id, Element* element) const
>{
>  if((id > 0) && (id < this->VectorType::size()))
>    {
>    if(element)
>      {
>      *element = this->VectorType::operator[](id);
>      }
>    return true;
>    }
>  return false;
>}
>
>
>
>----- Original Message -----
>From: "Ting Chen" <chenting@graphics.cis.upenn.edu>
>To: "Luis Ibanez" <ibanez@cs.unc.edu>
>Cc: "Insight toolkit" <Insight-developers@public.kitware.com>
>Sent: Thursday, March 01, 2001 2:01 PM
>Subject: Re: [Insight-developers] mesh data structure problem.
>
>
>> Hi! I have tried to add the memory allocation code before I do anything
to
>> the pointcontainer, but I still cannot get the correct answer,
>> and by the way, did you try to add that piece of code into itkMeshTest
and
>> run it?
>> ting
>> -----Original Message-----
>> From: Luis Ibanez <ibanez@cs.unc.edu>
>> To: Ting Chen <chenting@graphics.cis.upenn.edu>
>> Cc: Insight toolkit <Insight-developers@public.kitware.com>
>> Date: Thursday, March 01, 2001 8:17 AM
>> Subject: Re: [Insight-developers] mesh data structure problem.
>>
>>
>> >Hi Ting,
>> >
>> >my mistake, I should have said:
>> >
>> >    point.Value() = p;
>> >
>> >for the iterator,
>> >intead of :
>> >
>> >     point.Value( p )
>> >
>> >In any case, that will only help you
>> >with the speed of access.
>> >
>> >I think that the real problem in you
>> >code could be the allocation.
>> >Did you add a line like:
>> >
>> >   GetPoints()->Reserve( 1000 );
>> >
>> >before starting to get access to the
>> >points ?
>> >
>> >This line will allocate a number of
>> >points (1000 in this case ) for you.
>> >
>> >
>> >Hope that helps,
>> >
>> >Luis
>> >
>> >
>> >----------------------------------------
>> >
>> >On Wed, 28 Feb 2001, Ting Chen wrote:
>> >
>> >> but point.value take no parameter and just return the value stored at
>the
>> >> location, any other suggestion?
>> >>
>> >> >
>> >> >PointsContainerPointer      myPoints = GetPoints();
>> >> >PointsContainer::Iterator   point    = myPoints->Begin();
>> >> >PointType p;
>> >> >p = 0,0,0;
>> >> >while(  point != myPoints->End() )
>> >> >{
>> >> >    point.Value( p );
>> >> >    ++point;
>> >> >}
>> >> >
>> >> >
>> >> >
>> >> >Luis
>> >> >
>> >> >
>> >>
>>-----------------------------------------------------------------------
>> >> >
>> >> >Ting Chen wrote:
>> >> >
>> >> >> I write the following code in my itkDeformableMesh class:
>> >> >>
>> >> >> ....
>> >> >>   float ds[3], d[3]={0, 0, 0};
>> >> >>   SetPoint(1, (PointType)d);
>> >> >>   GetPoint(1, (PointType*)ds);
>> >> >> ....
>> >> >>
>> >> >> but I found out that ds={-1.074e+008, 0, 0} after the operation.
>> >> >>
>> >> >> if I do
>> >> >> ....
>> >> >>   float ds[3], d[3]={0, 0, 0};
>> >> >>   SetPoint(0, (PointType)d);
>> >> >>   GetPoint(0, (PointType*)ds);
>> >> >> ....
>> >> >>
>> >> >> ds = {-1.074e+008, -1.074e+008, -1.074e+008}
>> >> >>
>> >> >> it seems the first element in the container has problems here. what
>is
>> >> the
>> >> >> problem here?
>> >> >> thanks
>> >> >> ting
>> >> >>
>> >> >> _______________________________________________
>> >> >> Insight-developers mailing list
>> >> >> Insight-developers@public.kitware.com
>> >> >> http://public.kitware.com/mailman/listinfo/insight-developers
>> >> >
>> >> >--
>> >>
>______________________________________________________________________
>> >> >
>> >> >Luis Ibanez
>> >> >Research Assistant Professor - Division of Neurosurgery
>> >> >University of North Carolina at Chapel Hill
>> >> >CB# 7060, Chapel Hill, NC 27599
>> >> >email : ibanez@cs.unc.edu       home  : http://www.cs.unc.edu/~ibanez
>> >> >phone : (919)-843-9961          fax   : (919)-966-6627
>> >>
>______________________________________________________________________
>> >>
>> >>
>> >
>> >--
>> >-----------------------------------------------------------
>> >Luis Ibanez
>> >Research Assistant Professor - Division of NeuroSurgery
>> >University of North Carolina at Chapel Hill
>> >Chapel Hill, NC, 27599   http://www.cs.unc.edu/~ibanez
>> >------------------------------------------------------------
>> >
>> >
>> >
>> >_______________________________________________
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>> >http://public.kitware.com/mailman/listinfo/insight-developers
>>
>>
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>
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