Hello Greg,
first of all thanks for your patience.
Replies are inline:
On Mar 21, 2013, at 1:44 AM, Greg Fokum wrote:
> Hello everyone,
>
> I just came across vmtk and was wondering if I could you it for my work. My
> question is this:
>
> I have a tubular 3d surface ( length of colon) similar to the vessels you
> show in the tutorials except that there is not branching only bending.
Ok.
> I would like to map this 3D surface to a plane (or regular cylinder) using
> VMTK so that I can then create try to subdivide my tubular 3d surface (
> volume) in to sections ( alond the central axis direction) of equal volume
> based on mapping uniform strips on the mapped plane back to the 3D surface.
Note that we don't have full conformal mapping in vmtk: we can create a
longitudinal harmonic map, but the missing part is the harmonic mapping in the
circumferential direction. (I'm just mentioning this in case you are looking
for a fully conformal map as in the literature).
> I see a two step procedure:
>
> 1) first create a mapping from the 3D surface to a plane ( or in fact a
> regular cylinder such that volume is conserved)
>
> 2) cut sections of the cylinder and relate them to sections on the mesh.
>
> Is that possible with tools in VMTK ? If not please help me with some
> suggestions. I can send a sample of my mesh in wrl/vrml format.
It's quite easy to create a mapping to the plane of a cylindrical structure in
vmtk. Just follow this tutorial
http://www.vmtk.org/Tutorials/MappingAndPatching/ and even if you have no
branchings, just try running the scripts the same way.
For a mapping to the cylinder, then you'll have to code a bit. Actually a lot
of the basic tools are there in vmtk already (differential geometry classes for
the mappings etc), but it would require you to code, you can't just do it from
the command line.
Feel free to seek more specific inputs on the list.
Thanks
Luca
> thank you
>
> GT
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