Visualizing Seismic Data

[David Gobbi]

Hi Michael,

You should be able to use memmap() to map the disk file to memory,
and then pass the memory pointer to VTK via vtkImageImport.  This
would require a UNIX system (for memmap) and the VTK nightlies
for vtkImageImport.  Haven't tried it myself.

 - David

--
  David Gobbi, MSc                    dgobbi at irus.rri.on.ca
  Advanced Imaging Research Group
  Robarts Research Institute, University of Western Ontario

On Wed, 22 Dec 1999, Michael Dennis wrote:

> Greetings all,
> 
> I am investigating using VTK to visualize seismic data.  The biggest
> issue that I currently see is the volume of data needed to visualize a
> seismic project.  For example I am trying to load a relatively small 3D
> Seismic section (in terms of seismic data).  The sections dimensions are
> X=100, Y=200, Z=1501.
> 
> I am trying to load it as a rectilinear grid.  I can set load the grid
> quite easily.  Setting up the scalars, however, poses a different
> issue.  This dataset contains 30,020,000 of 16 bit integer samples.
> This amounts to approx. 60 MB of memory required to load all the scalars
> for the entire dataset.  If I have to load the entire dataset of scalars
> it will quickly stress my memory resources.  Is there anyway of paging
> scalars for a volume of data in VTK?  Or is there any way so it can load
> based upon demand and do some intelligent caching management?  If I was
> to write this myself would it even be possible to use for volume
> rendering or does volume rendering REQUIRE the entire dataset to be
> loaded?  What about VolView, does it load the entire dataset as well?
> Remember that this is a *small* 3D seismic section in relation to
> typical seismic sections.
> 
> Any advice or assistance would be greatly appreciated.
> 
> KERNEL Technologies Ltd.
> Michael Dennis
> 
> 
> 
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