regarding .PLY , .STY , .OBJ file extensions

does anybody know how to read in the .PLY,.STY,.OBJ extension files in matlab..any info would be very helpful..

[Walter Roberson]

Should that be .STL instead of .STY ??

[ramakrishna bathini]

its .STY file type

[Walter Roberson]

I'm having trouble finding anything for .STY except for use as LaTex Style files ?

Answer 1

[Walter Roberson]

If I can convince you that you did mean .STL after all, then there is a script to read such files in binary or ascii format, here

There is a library available for reading and writing PLY files in Matlab, here

[ramakrishna bathini]

the link was awesome...the program Ply_to_tri_mesh did half the job....now i am left with hardest thing i think the unwrapping of the cylindrical 3d object onto the 2D plane

Answer 2

[Walter Roberson]

A description of Lightwave's .OBJ format can be found here

It supports aspects such as vertex shading and vertex normals, not just pure geometry, so a full implementation might take effort.

I seem to recall I was a little confused over the face / vertex representation when I read the documentation before.

[ramakrishna bathini]

thank you for the .obj format info..it was very useful indeed...

[Walter Roberson]

.ply file format is describe at

http://local.wasp.uwa.edu.au/~pbourke/dataformats/ply/

Answer 3

[Glenn]

Is it possible to export x, y, z, R, G, B data to a .ply file in matlab. If so how can I go about doing this. There doesn't seem to be the function within matlab. I have imported a .ply file using importdata which has been fine. Is it now possible to analyse that data to extract certain points and then place those points in their own ply file so that I can view it in MeshLab?? Any help would be most appreciated cheers, Glenn

[Walter Roberson]

I'm not sure. Possibly using the ply_write.m routine from the library mentioned above. Direct link to it is http://people.sc.fsu.edu/~jburkardt/m_src/ply_io/ply_write.m