I guess I do have such an u-v-plane. The background of the background :
The task is to map an image onto a 3D geometry. The image includes reference points, which correspond to known x-y-z coordinates. So the image plane is (my guess) the u-v-plane. BR Philipp Am Fr., 20. Nov. 2020 um 12:16 Uhr schrieb Stéphane Mottelet < [email protected]>: > In order to use mesh2d with your data, there must exist a plane (u,v) on > which you could project your (x,y,z) data. The mesh obtained on projected > data (u,v) would give you the triangulation of the (x,z,y) data. This won't > be possible with mesh2d if you take for example scattered points on a > sphere. However, any non-linear transformation "unfolding" the data could > also help to use pure 2d tools like mesh2d. > > S. > Le 20/11/2020 à 12:05, P M a écrit : > > > > Am Fr., 20. Nov. 2020 um 11:47 Uhr schrieb Stéphane Mottelet < > [email protected]>: > >> 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 < >> [email protected]>: >> >>> 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 >>> >>> _______________________________________________ >>> users mailing >>> [email protected]https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users >>> >>> <https://antispam.utc.fr/proxy/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/antispam.utc.fr/proxy/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users> >>> >>> -- >>> 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/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/www.utc.fr/~mottelet> >>> >>> _______________________________________________ >>> users mailing list >>> [email protected] >>> http://lists.scilab.org/mailman/listinfo/users >>> <https://antispam.utc.fr/proxy/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users> >>> >> >> _______________________________________________ >> users mailing >> [email protected]https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users >> >> <https://antispam.utc.fr/proxy/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users> >> >> -- >> 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> >> >> _______________________________________________ >> users mailing list >> [email protected] >> http://lists.scilab.org/mailman/listinfo/users >> <https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users> >> > > _______________________________________________ > users mailing > [email protected]https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users > > -- > 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 > > _______________________________________________ > users mailing list > [email protected] > http://lists.scilab.org/mailman/listinfo/users >
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