[MORPHMET] Trying to trace a quote

2016-10-19 Thread Bill Sellers
Dear All,

I wonder if anyone can help me. I'm trying to trace a quotation that a now long 
retired colleague of mine used to use. He doesn't remember where he got it from 
but it is very apt, and since it relates to animal shape I'm hoping someone on 
this mailing list will recognise it (particularly since I'm probably not 
remembering it quite properly and google is being unhelpful). The quote as best 
I remember it is:

"Give me 4 parameters and I can build you an elephant. Give me 5 and I can make 
it wag its tail."

I've always imagined it was something that a 1930s developmental biologist or 
mathematician would have said when discussing the utility of developmental 
models at the time.

Can anyone help?

Cheers
Bill
--
Bill Sellers, Tel: 01612751719, Mobile: 07857655786, 
http://www.animalsimulation.org 
University of Manchester, D1239 Michael Smith Building, Manchester, M13 9PT.

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Re: [MORPHMET] How to export .obj with textures as .ply with colours for morphometric analyses?

2016-09-02 Thread Bill Sellers

This is actually quite a tricky thing to do. Texturing in OBJ files maps part 
of an image onto a surface triangle. There are no vertices associated with the 
colours. PLY files work differently and each vertex has its own colour. To 
recreate the textures in a PLY file you would need to create a new vertex for 
each pixel in the OBJ file. That would make the file very much larger and 
involve a moderate amount of geometric calculation. I don't know of any 
software package that will do this for you (it isn't particularly hard but I 
doubt there is much demand). However there are plenty of software packages that 
will read textured OBJ files and let you make measurements of points on faces 
(Blender can do this for example). The problem is that the process isn't 
streamlined to make taking large numbers of measurements particularly quick and 
easy. Also I would worry that you are losing quite a lot of accuracy in this 
approach because the 3D position will just be linearly interpolated from the 
vertices and this may give you a false sense of the precision of the technique.

Cheers
Bill
--
Bill Sellers, Tel: 01612751719, Mobile: 07857655786, 
http://www.animalsimulation.org
University of Manchester, D1239 Michael Smith Building, Manchester, M13 9PT.

On 01/09/2016 12:31, M. Viviana Toro Ibacache wrote:

Deal Morphometricians,

I have .obj files with textures from three .jpg photos. I can load and see the 
textures very nicely in Meshlab, but I need the textures to be transformed into 
a coloured .ply file to do geometric morphometric analyses (the landmarks are 
represented in the textures). So far it has not worked doing it from Meshlab, 
so my questions are:

- I know I can place landmarks in Meshlab using the .obj file, but when I do 
it, the software crashes. any thoughts? the .obj file is 16 Mb big. Is there a 
limit to files size in Meshlab? I would rather not to downsample the mesh to 
not lose anatomical details.

- When using the Transfer Texture to Vertex Color function, the texture gets 
messed. It seems from web forums that Mshlab takes only one of the (in this 
case) three .jpg files to do the colouring of the .ply mesh. Does anybody know 
how to fix this? Another freeware software?

- Is there any landmark acquisition software that loads .obj files with 
textures? So far, I have not been able to do it in Landmark Editor, Evan 
toolbox, Avizo, Morpho nor Geomorph.

Any help is greatly appreciated.

Best (y saludos),
Viviana



--
*
Viviana Toro-Ibacache DDS MSc PhD*
Profesora Asistente /(Assistant Professor)/
Centro de Análisis Cuantitativo en Antropología Dental (CA2)
Unidad de Anatomía, Instituto de Investigación en Ciencias Odontológicas
Facultad de Odontología Universidad de Chile

Dirección:  Sergio Livingstone Pohlhammer 943
/(address)/   Independencia, Región Metropolitana
 Chile
Email:mtoroibaca...@odontologia.uchile.cl 
<mailto:mtoroibaca...@odontologia.uchile.cl>
Web: www.researchgate.net/profile/Viviana_Toro_Ibacache/ 
<http://www.researchgate.net/profile/Viviana_Toro_Ibacache/>
 www.cienciaymemoria.cl/staff.html 
<http://www.cienciaymemoria.cl/staff.html>

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