[vtkusers] Generation of Tet Mesh from Stack of Binary Images

[Dominik Szczerba]

See below

Michael Jackson wrote:
> I'm getting into some new territory for myself so I was hoping to get a 
> "push" in the proper direction from the vtk community.
> 
> I have a stack of binary images (black and white). I would like to turn 
> this into a "TetMesh" in order to feed that tetmesh into an Finite 
> Element analysis program.
> 
> Question: what is the basic workflow/pipeline or what filters do I need 
> to use to get there. From searching around in the VTK docs it looks like 
> I should be able to use the vtkRectilinearGridToTetrahedra class. 
> Getting the my image stack into the vtkRectilinearGrid is straight 
> forward code.
> 
> Is this the correct approach?
> 
> Also could anyone comment on the amount of memory usage based on stack 
> size? For instance the initial stack of images would be 7700px X 8720px 
> X 870px. Lets assume about 30% to 40% of the volume is the phase that I 
> want meshed. Trying to figure out if this is even doable on a "PC" (even 
> one with 32GB of RAM and 64 Bit OS) or if I need to go to a 
> "SuperComputer" to get the mesh complete. There is a possibility of 
> reducing the XY pixel size by resampling the image if that would help.

This resolution you can forget even with 128 GB RAM. The way I go is to 
partition the voxel space first and generate separate meshes for each 
domain. The devil lies in how you make the mesh compatible on the 
boundaries.

Dominik

> 
> Thanks in advance for any comments or words of wisdom.
> 
> Respectfully
> _________________________________________________________
> Mike Jackson                  mike.jackson at bluequartz.net
> BlueQuartz Software                    www.bluequartz.net
> Principal Software Engineer                  Dayton, Ohio
> 
> 
> 
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-- 
Dominik Szczerba, PhD
Computational Physics Group
IT'IS Foundation
http://www.itis.ethz.ch