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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