Converting a 3D logical array into an STL surface mesh

Conversion of a voxelised object contained within a 3D logical array into an STL surface mesh.

Description

Converting a 3D logical array into an STL surface mesh
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Adam H. Aitkenhead
[e-mail]
The Christie NHS Foundation Trust
24th May 2010
 
 
USAGE
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>> CONVERT_voxels_to_stl(STLname,gridDATA,gridX,gridY,gridZ,'ascii')
converts the voxelised object contained within the 3D logical array <gridINPUT> into an STL surface mesh, which is saved to the ascii file <STLin>. The x,y,z axes for <gridINPUT> are defined by <gridX>, <gridY> and <gridZ>.
 
 
INPUT PARAMETERS
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STLname - string - Filename of the STL file.
gridINPUT - 3D logical array of size (P,Q,R) - The voxelised object (1 => Inside the object, 0 => Outside the object)
gridX - A 1xP array - List of the X axis coordinates.
gridY - A 1xQ array - List of the Y axis coordinates.
gridZ - A 1xR array - List of the Z axis coordinates.
STLformat - string (optional) - STL file format: 'binary' or 'ascii'.
 
 
EXAMPLE
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For an example, run the following script:
>> CONVERT_voxels_to_stl_example
 
 
NOTES
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- This code does not apply any smoothing. The stl mesh will be exactly the same geometry as the original voxelised object.
 
 

• MATLAB release: MATLAB 7.10 (2010a)

[Johannes Korsawe]

Really good and fast.
Sometimes there seem to be some artifacts (missing faces) in the resulting mesh. I have not already discovered where, but suspect a missing line somewhere.

Thanks for sharing!

[Adam A]

Hi Johannes. If you're able to send an example of an array and the resulting mesh I will see if I can duplicate and fix any problems.