meshlab-devel

[Meshlab-devel] Two questions concerning point clouds

[Clifford Y. <cli...@gm...>]

Hi!  I'm interested in Meshlab's point cloud support, and I have two
questions concerning it:

1)  Import a simple file of xyz points into Meshlab, with an eye to building
a mesh from them (think basic surface scan)  - can it be done?

2)  More generally, does anyone know if there is a listing of various "point
cloud" data formats anywhere and how to convert to/from the various options?

Thanks,
C Y

Re: [Meshlab-devel] Two questions concerning point clouds

[Norbert W. <n_w...@gm...>]

On 11/12/2008 05:21 AM, Clifford Yapp wrote:
> 1)  Import a simple file of xyz points into Meshlab, with an eye to building
> a mesh from them (think basic surface scan)  - can it be done?

Not directly, at least I didn't get it. I've "converted" simple xyz 
files (points only) to obj by just adding "v " at the beginning of every 
line. These did load very well.

> 2)  More generally, does anyone know if there is a listing of various "point
> cloud" data formats anywhere and how to convert to/from the various options?

I've not searched for that, but I did not find a list. I'd recommend to 
look at various point cloud software and see what they are able to 
handle. Personally I'd suggest you try ply files, I think these are 
relatively common (at least for academic software) because that's the 
format of the data in the Stanford scanning repository.

Norbert

Re: [Meshlab-devel] Two questions concerning point clouds

[Clifford Y. <cli...@gm...>]

On Wednesday 12 November 2008 02:15:22 am Norbert Wenzel wrote:
> On 11/12/2008 05:21 AM, Clifford Yapp wrote:
> > 1)  Import a simple file of xyz points into Meshlab, with an eye to
> > building a mesh from them (think basic surface scan)  - can it be done?
>
> Not directly, at least I didn't get it. I've "converted" simple xyz
> files (points only) to obj by just adding "v " at the beginning of every
> line. These did load very well.

Excellent!  That worked - thank you!  Can a mesh be built from the points - 
i.e. a Delaunay triangulation?  Most of the filters I try to run just result 
in crashes :-(.

Cheers,
CY

Re: [Meshlab-devel] Two questions concerning point clouds

[Norbert W. <n_w...@gm...>]

On 11/12/2008 02:15 PM, Clifford Yapp wrote:
> On Wednesday 12 November 2008 02:15:22 am Norbert Wenzel wrote:
>> On 11/12/2008 05:21 AM, Clifford Yapp wrote:
>>> 1)  Import a simple file of xyz points into Meshlab, with an eye to
>>> building a mesh from them (think basic surface scan)  - can it be done?
>> Not directly, at least I didn't get it. I've "converted" simple xyz
>> files (points only) to obj by just adding "v " at the beginning of every
>> line. These did load very well.
>
> Excellent!  That worked - thank you!  Can a mesh be built from the points -
> i.e. a Delaunay triangulation?  Most of the filters I try to run just result
> in crashes :-(.

Afaik there's no Delaunay based algorithm currently implemented in 
Meshlab. Ball Pivoting works well for my datasets, I'm not quite sure 
about Poisson reconstruction.
If you plan to use the MLS stuff from the current development version, I 
suggest you wait until my question in the Sourceforge Help Forum[0] is 
answered, since at the moment my Meshlab always crashes when I try to 
reconstruction my selfmade objs.

Norbert

[0] 
https://sourceforge.net/forum/forum.php?thread_id=2540435&forum_id=499533