[Paraview] Re: [vtkusers] paraview crashes in VTK with > 2^31 points

[Sean McBride]

On 11/22/07 2:14 PM, Marco Ehlert said:

>does paraview (resp. VTK) support data sets of
>more than 2^31 points on 64bit x86 ?

Which OS and which compiler are you on?  Does it use LP64, ILP64, LLP64.
etc?  See:
<http://en.wikipedia.org/wiki/ILP64#64-bit_data_models>

>I am using a raw file with dimension
>1630x1250x1520 of 8bit-points.
>
>During file reading paraview crashes with SIGFAULT.
>The crash seems based on a wrong 'int' calculation in
>
>    vtkImageData::AllocateScalars().
>
>After first attempt of fixing it roughly
>
>/*
>     scalars->SetNumberOfTuples((extent[1] - extent[0] + 1)*
>                                (extent[3] - extent[2] + 1)*
>                                (extent[5] - extent[4] + 1));
>*/
>     scalars->SetNumberOfTuples((long)(extent[1] - extent[0] + 1)*
>                                (long)(extent[3] - extent[2] + 1)*
>                                (long)(extent[5] - extent[4] + 1));

If that fixes it, then I'm guessing that on your system int and long are
a different size.  Probably Linux or Mac OS X?

You seem to have found a genuine overflow, but casting to long is not
the best fix, since in an LLP64 system both are 32 bit.

>the file is read fine now, but paraview does not display
>any points. On the other hand arrays of 400x400x400
>are displayed perfectly. Maybe there are more such bugs
>in paraview components. At least the above bug is still
>present in current CVS VTK tree.
>
>Any idea how to debug this situation and fix it completely
>is appreciated.

I have looked briefly at the state of VTK wrt 64 bit, and in my opinion
there is a lot of work to be done.  How to fix it completely?  I don't
know how much kitware has investigated the whole thing, but maybe
something should be started here:

<http://www.vtk.org/Wiki/Proposed_Changes_to_VTK> 

-- 
____________________________________________________________
Sean McBride, B. Eng                 sean at rogue-research.com
Rogue Research                        www.rogue-research.com 
Mac Software Developer              Montréal, Québec, Canada