[vtkusers] Scan convert a mesh to voxel data

[Roman Grothausmann]

Dear mailing list members,


We try to create a small py-script that allows one to create a test 
image from a few blender meshes. The idea is to create some blender mesh 
objects that then get rasterized into 3D voxel data (dimensions are 
supplied by the user). We'd want a black (value 0) backgournd and closed 
meshs to be filled by a foreground value, either 1 for all or a 
different integer value for each individual object. As a later extension 
: open meshes we'd like to get a voxel contour of and points should turn 
up as a single voxels.
In the software Avizo the module doing this is called ScanConvertSurface.

Concentrating on the closed meshes first:
We tried vtkVoxelModeller (see 
http://www.vtk.org/pipermail/vtkusers/2010-March/106866.html) but with 
no luck. For one vtk_bit is no longer supported by the image writer (as 
mentioned in the example: 
http://www.itk.org/Wiki/VTK/Examples/VoxelModeller). The 
vtkVoxelModeller test uses vtkDataSetWriter. But if we look at the 
output then with paraview, we see nothing.
Using vtkImplicitModeller we get some output but closed mesh-objects 
don't get filled.
Is there a better way to do this?

I found also this thread: 
http://www.vtk.org/pipermail/vtkusers/2010-March/107087.html

The problem seems similar but I wonder what the vtkVoxelModeller is 
meant for? Why would one start with a mesh, voxelize it and then mesh it 
again? That's in that tread and also in the vtkVoxelModeller test.

Any help or hints on this are very much appreciated
Roman


-- 
Roman Grothausmann

Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Bereich Funktionale Materialien
Institut für angewandte Materialforschung
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