Tr : [vtkusers] Bug with vtkStructuredPoints when alloctaing scalars

[Amy Squillacote]

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 !
>
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