using mesh file in matlab

[Ulrich Aretz]

Dear itkSnap users,

I want to use/read an exported mesh file (VTK PolyDataFile or STL
file) from itkSnap in MATLAB.
For that I have to know how the mesh is build and what each line
means? Where stands the first node/vertex and edge/face?

It would be great if anybody can help.
Thank you for your efforts.

Best regards
Uli

[Paul Yushkevich]

I have scripts for reading the VTK data here:

http://cmrep.cvs.sourceforge.net/viewvc/cmrep/cmrep/scripts/matlab/

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Paul A. Yushkevich, Ph.D.
Assistant Professor
Penn Image Computing and Science Laboratory
Department of Radiology
University of Pennsylvania

[Ulrich Aretz]

Dear Paul,

thank you for your fast respond.
The function works and it seems to be the right method for me but I
have some questions about the arguments:

- What is the difference between p.points and p.point_data.data?
- The point coordinates stand in p.point, don't they? I call them nodes.
- Where are the edges (the lines between the nodes) and how are they organized?

Thanks for help.

Best regards
Uli

2011/6/9 Paul Yushkevich <pau...@mail.med.upenn.edu>:

[Paul Yushkevich]

Uli

p.points are the node coordinates. p.point_data are all the attribute arrays that can be stored in a VTK mesh.

p.cells.polygons are the faces (triangles)

there is no explicit representation of the edges. However, MATLAB 2009+ has a nice TriRep class that can generate edge and other information from vertices and faces.

Paul.