Tr : [vtkusers] Bug with vtkStructuredPoints when alloctaing scalars

[Amy Squillacote]

I'm posting this back to the VTK user's list so maybe other people can 
help you with your problem.

- Amy

Mohamed Ben Reguiga wrote:
> hi,
> well, I can say that I'm sure that I'm not running out of memory when 
> I allocate memory, because I 'm doing tests with the same set of 
> Images from wich I constitute the MPR plans and when I close the MPR 
> window I do deallocate the memory allocated before and when I 'm 
> testing I only run VS2005 to edit my project. Using the Window's Tasks 
> Manager, and when the bug happens , I see that the memory is really 
> deallocated after closing the window  but not reallocated after 
> calling AllocateScalars in the next time.
> -So why it goes allright for several times and in the tenth or more it 
> crashes and in wicth conditions the allocation is not done?
>
> -to answer to your question the set of the images is equal to : 300Mo
> - my PC is a 1Go of RAM and a 3GHz clock processor (Intel P4).
>
> thank you for your help!
>
> ----- Message transféré ----
> De : Amy Squillacote <amy.squillacote at kitware.com>
> À : Mohamed Ben Reguiga <breguiga_mh at yahoo.fr>
> Cc : Gabriel Kiss <gg1977 at gmail.com>; VTK_Users <vtkusers at vtk.org>
> Envoyé le : Vendredi, 7 Juillet 2006, 2h00mn 19s
> Objet : Re: Tr : [vtkusers] Bug with vtkStructuredPoints when 
> alloctaing scalars
>
> Is it possible that you are running out of memory when you try to
> allocate the scalars? What are the dimensions of the vtkStructuredPoints
> dataset when AllocateScalars() does not allocate memory?
>
> - Amy
>
> Mohamed Ben Reguiga wrote:
> > hello,
> > thank you for the answer but I still have the same bug!
> > is it possible, at least , to know if the Allocation was done or not?
> > the allocateScalrs() function is a void return function so how can I
> > be advised if the allocation is ok or not?
> >
> > thank you for your help!
> >
> > ----- Message transféré ----
> > De : Gabriel Kiss <gg1977 at gmail.com>
> > À : Mohamed Ben Reguiga <breguiga_mh at yahoo.fr>
> > Envoyé le : Vendredi, 7 Juillet 2006, 1h18mn 43s
> > Objet : Re: [vtkusers] Bug with vtkStructuredPoints when alloctaing
> > scalars
> >
> > Hi,
> >
> > Does it help if you add also:
> >
> > data2->SetNumberOfScalarComponents(1);
> >
> > gg
> >
> > On 7/6/06, *Mohamed Ben Reguiga* < breguiga_mh at yahoo.fr
> > <mailto:breguiga_mh at yahoo.fr>> wrote:
> >
> >     hello all,
> >     I 'm using VTK for 3D reconstitution , MPR and MIP (maximum
> >     intesity projection).
> >     for the constitution of the volume of all the pixmaps of the
> >     images I use a vtkStructuredPoints object :
> >     data2=vtkStructuredPoints::New();
> >     data2->SetDimensions(WdthVlm,HghtVlm,DpthVlm);                  
> >     data2->SetSpacing (wdgMPR->xsp, wdgMPR->ysp, wdgMPR->zsp);
> >     data2->SetScalarType(VTK_UNSIGNED_SHORT);
> >     data2->AllocateScalars();
> >
> >     after thar I recover the scalarpointer to fill the volume by the
> >     data that i own :
> >
> >     unsigned short * ptr2=(unsigned short *) data2->GetScalarPointer();
> >
> >       for (cptdcm=0;cptdcm<DpthVlm;cptdcm++)
> >       {
> >         for(int i=0;i<HghtVlm;i++)
> >         {
> >             for(int j=0; j<WdthVlm;j++)
> >             {
> >              *(ptr2++)  =  *(myDataImages++); //myDataImages is a
> >     unsigned short pointer of course
> >             }
> >         }
> >       }
> >
> >     then I use the vtkStructuredPoints object like an input for the
> >     vtkImageMapToColors that I use (3 : 1 for each plane X, Y and Z).
> >
> >     every thing goes allright but sometimes something wrong happens
> >     and I don't know why :
> >     the allocation of the memory is not accomplished when I do :
> >     data2->AllocateScalars(); and the value of  unsigned short *
> >     ptr2=(unsigned short *) data2->GetScalarPointer() is 0x00000 and I
> >     when I chek the system use of the memory : theer is not a memory
> >     allocated !!!!!!!
> >
> >     could you please help me to know when this function doesn't do
> >     allocate memory and is there sthing to do before allocating to
> >     prevent from such problems!
> >     it's really an emergency!
> >     thank you for your help !
> >
>