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regarding .PLY , .STY , .OBJ file extensions

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

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Walter Roberson
Walter Roberson 2011-2-15
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
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ramakrishna bathini
ramakrishna bathini 2011-2-15
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

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更多回答（2 个）

Walter Roberson
Walter Roberson 2011-2-14
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.
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ramakrishna bathini
ramakrishna bathini 2011-2-14
thank you for the .obj format info..it was very useful indeed...
Walter Roberson
Walter Roberson 2011-2-15
.ply file format is describe at
http://local.wasp.uwa.edu.au/~pbourke/dataformats/ply/

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Glenn
Glenn 2011-9-22
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
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Walter Roberson
Walter Roberson 2011-9-22
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

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