CGAL users discussion list

[Andrea Cortis <>]

Dear Laurent,

I think I have now understood what you meant ... I will let you know
of how it goes.

Thanks again

Andrea

On Tue, May 15, 2012 at 3:03 PM, Andrea Cortis 
<>
 wrote:
> Dear Laurent, thanks for your help.
>
> I think I can figure out a way to get that information from the
> segmented image ... how do I need to encode that information?
>
> Andrea
>
>
>
> On Tue, May 15, 2012 at 8:17 AM, Laurent Rineau (GeometryFactory)
> <>
>  wrote:
>> Le lundi 14 mai 2012 11:29:01 Andrea Cortis a écrit :
>>> Dear All,
>>>
>>> I am new to CGAL and seeking help on how to generate a 3d mesh from a
>>> segmented image.
>>> So far I have been able to run the examples at
>>>
>>> [1]
>>> http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Mesh_3/Chapter_main.
>>> html#Subsection_50.3.3
>>>
>>> [2]
>>> http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Surface_mesher/Chapt
>>> er_main.html
>>>
>>> I have also run some examples on my own images, but I am finding some
>>> problems with segmented images that consist of isolated regions. In
>>> particular, I have noticed that, generally speaking (1) only some of
>>> the isolated regions are correctly spotted, and (2) which regions are
>>> spotted depends on the center and radius of the ball in link [2] and,
>>> for the same radius and center, it depends on the particular
>>> random_seed number.
>>>
>>> I have uploaded a "test.inr" file at this location:
>>>
>>> http://www.tempfiles.net/download/201205/243508/test.html
>>>
>>> (Please let me know if you are able to download it correctly)
>>>
>>>
>>>
>>> I would greatly appreciate any help on this problem. Thanks in advance,
>>
>> Do you have a way to know in advance how many isolated regions you have, do
>> you have a way to find an rough enclosing sphere for each (with the 
>> constraint
>> that the center of the sphere is inside the region)? In that case I might
>> help.
>>
>> The issue is the initialization step of the meshing process. It uses random
>> ray queries, issuing from the center of the sphere you give. To find out 
>> all
>> regions, one needs to run that process for each region.
>>
>> --
>> Laurent Rineau, PhD
>> R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
>> Release Manager of the CGAL Project       http://www.cgal.org/
>>
>>
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