Yes, just mesh the set of (u,v) coordinates corresponding to your
(x,y,z) reference points.
S.
Le 20/11/2020 à 13:05, P M a écrit :
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
<stephane.motte...@utc.fr <mailto:stephane.motte...@utc.fr>>:
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
<stephane.motte...@utc.fr <mailto:stephane.motte...@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.motte...@utc.fr <mailto:stephane.motte...@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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EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
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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
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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)344234688
http://www.utc.fr/~mottelet
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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
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