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The problem of importing from scientific imaging systems [message #10287] Sun, 28 February 2010 08:32 UTC Go to previous message
avatar kshort  is currently offline kshort
Messages: 4
Registered: August 2008
Go to my shop
Junior Member
Hi all,

I have an interesting problem, basically revolving around non-manifold issues.

I have datasets that are from tomographic scans, which I make a solid binary .bmp stack from. I then use another piece of software to create an isosurface of that, and then I generate a VRML from that isosurface.
I can get a detailed model of 450000 faces, and it is watertight according to AccuTrans3d, and there are 7 edges (14 vertices) shared with 3 or more polygons. Not bad for a model of that complexity, I thought.

.. but blender lights the model up like a christmas tree when I do a non-manifold check (1.35 million edges selected out of 1.35 million). I figured it might be an issue with Normals, so I checked in 3DSmax, and sure enough there were normals facing in, and others outwards. I unified these (automatically) and from my quick look, it seemed to work.

Now when I upload the model, i get a manifold problem, and the same recurring issue with the manifold selection in Blender.

I can't manually generate this mesh, because it is generated from biological data, so I need to fix it. However, I don't know what the manifold issue is that Blender is detecting. It is a single object, tested as watertight.

Can anyone point me in the right direction? The Shapeways tute on Manifold problem ressureciton didn't really help because my problem is so massive.

thanks for any pointers
Kieran

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