[Scilab-users] mesh2d - finding identical points

[P M]

Am Fr., 20. Nov. 2020 um 11:47 Uhr schrieb Stéphane Mottelet <
stephane.mottelet at utc.fr>:

> Hi again,
> Le 20/11/2020 à 11:30, P M a écrit :
>
> OK,
> some more background:
>
> I actually want to perform a delaunay triangulation on a set of
> X-Y-Z-coordinates.
>
> I suppose you mean a triangulation of scattered X-Y-Z but you call mesh2d
> with X-Y only ?
>

Yes, indeed. And there is the bug in my data.
As x-y coordinates repeat, they do have a different z in the original data.
But since I call mesh2d with x-y only there are indeed identical points.



>
> I know of CGLAB, but it seems only available to Scilab 6.0.x, while I am
> on Scilab 6.1.0
>
> CGLAB is based on a very old version of CGAL and thus is very hard  to
> maintain as is. There is a lot of work...
>

I am currently installing Scilab 6.0 to try CGLAB...

>
> So the nearest thing to a delaunay triangulation I found is mesh2d...
>
> Yeah. Suboptimal choice indeed...
>
> Because of the delaunay triangulation, I am not sure if the order of
> points may change.
>
> What do you mean ?
>

The scattered points represent a 3D surface geometry.
If the points will be resorted, I could imagine that the triangulation does
not fit to the surface geometry anymore.

>
> About unique:
>
> The result I get is actual of same size as the input matrix...I therefore
> do assume that each point is unique in the first place (which they actually
> should).
>
> What does repeat are individual x, y, z coordinates, but in different
> combinations.
> So the actual point is different.
>
>
> e.g.:    x may repeat, but than the y-z-coordinates are different from
> point to point
>
> Could you share the data (you can send me a private message) ?
>
> S.
>
>
> Thanks,
> Philipp
>
>
>
> Am Fr., 20. Nov. 2020 um 10:57 Uhr schrieb Stéphane Mottelet <
> stephane.mottelet at utc.fr>:
>
>> Hi Philipp,
>>
>> Glad to hear that some people use mesh2d. I know we have to improve the
>> error message by getting the numbers at the Fortran level... There is also
>> other errors which are not easy to fix without knowing the number of the
>> problematic point (point too close to the boundary, for example). Can you
>> file a bug on BZ ?
>>
>> S.
>> Le 20/11/2020 à 10:03, P M a écrit :
>>
>> Dear all,
>>
>> using the mesh2d - function I get an error:     mesh2di: some points are
>> identical.
>>
>>
>> How to identify these points and remove the duplicates?
>>
>> There are roughly 500'000 coordinates....
>>
>> Thank you,
>> Philipp
>>
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>> --
>> Stéphane Mottelet
>> Ingénieur de recherche
>> EA 4297 Transformations Intégrées de la Matière Renouvelable
>> Département Génie des Procédés Industriels
>> Sorbonne Universités - Université de Technologie de Compiègne
>> CS 60319, 60203 Compiègne cedex
>> Tel : +33(0)344234688http://www.utc.fr/~mottelet <https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/www.utc.fr/~mottelet>
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> --
> Stéphane Mottelet
> Ingénieur de recherche
> EA 4297 Transformations Intégrées de la Matière Renouvelable
> Département Génie des Procédés Industriels
> Sorbonne Universités - Université de Technologie de Compiègne
> CS 60319, 60203 Compiègne cedex
> Tel : +33(0)344234688http://www.utc.fr/~mottelet
>
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