<div dir="ltr"><div>I guess I do have such an u-v-plane.</div><div><br></div><div>The background of the background :</div><div><br></div><div>The task is to map an image onto a 3D geometry.<br></div><div><br></div><div>The image includes reference points, which correspond to known x-y-z coordinates.<br></div><div><br></div><div>So the image plane is (my guess) the u-v-plane.</div><div><br></div><div>BR</div><div>Philipp<br></div><div><br></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Am Fr., 20. Nov. 2020 um 12:16 Uhr schrieb Stéphane Mottelet <<a href="mailto:stephane.mottelet@utc.fr">stephane.mottelet@utc.fr</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>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.<br>
</p>
<p>S.<br>
</p>
<div>Le 20/11/2020 à 12:05, P M a écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr"><br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Am Fr., 20. Nov. 2020 um
11:47 Uhr schrieb Stéphane Mottelet <<a href="mailto:stephane.mottelet@utc.fr" target="_blank">stephane.mottelet@utc.fr</a>>:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Hi again,<br>
</p>
<div>Le 20/11/2020 à 11:30, P M a écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>OK,</div>
<div>some more background:</div>
<div><br>
</div>
<div>I actually want to perform a delaunay
triangulation on a set of X-Y-Z-coordinates.</div>
</div>
</blockquote>
I suppose you mean a triangulation of scattered X-Y-Z but
you call mesh2d with X-Y only ?<br>
</div>
</blockquote>
<div><br>
</div>
<div>Yes, indeed. And there is the bug in my data.</div>
<div>As x-y coordinates repeat, they do have a different z in
the original data.</div>
<div>But since I call mesh2d with x-y only there are indeed
identical points.<br>
</div>
<div><br>
</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<blockquote type="cite">
<div dir="ltr">
<div><br>
</div>
<div>I know of CGLAB, but it seems only available to
Scilab 6.0.x, while I am on Scilab 6.1.0</div>
</div>
</blockquote>
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...<br>
</div>
</blockquote>
<div><br>
</div>
<div>I am currently installing Scilab 6.0 to try CGLAB... <br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<blockquote type="cite">
<div dir="ltr">
<div><br>
</div>
<div>So the nearest thing to a delaunay triangulation
I found is mesh2d...</div>
</div>
</blockquote>
Yeah. Suboptimal choice indeed...<br>
<blockquote type="cite">
<div dir="ltr">
<div>Because of the delaunay triangulation, I am not
sure if the order of points may change.<br>
</div>
</div>
</blockquote>
What do you mean ?<br>
</div>
</blockquote>
<div><br>
</div>
<div>The scattered points represent a 3D surface geometry.</div>
<div>If the points will be resorted, I could imagine that the
triangulation does not fit to the surface geometry anymore.<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<blockquote type="cite">
<div dir="ltr">
<div><br>
</div>
<div>About unique:</div>
<div><br>
</div>
<div>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).</div>
<div><br>
</div>
<div>What does repeat are individual x, y, z
coordinates, but in different combinations.</div>
<div>So the actual point is different.</div>
<div><br>
</div>
<div><br>
</div>
<div>e.g.: x may repeat, but than the
y-z-coordinates are different from point to point</div>
</div>
</blockquote>
<p>Could you share the data (you can send me a private
message) ?<br>
</p>
<p>S.<br>
</p>
<blockquote type="cite">
<div dir="ltr">
<div> <br>
</div>
<div>Thanks,</div>
<div>Philipp<br>
</div>
<div>
<div><br>
</div>
<div><br>
</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Am Fr., 20. Nov.
2020 um 10:57 Uhr schrieb Stéphane Mottelet <<a href="mailto:stephane.mottelet@utc.fr" target="_blank">stephane.mottelet@utc.fr</a>>:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Hi Philipp,</p>
<p>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
?</p>
<p>S.<br>
</p>
<div>Le 20/11/2020 à 10:03, P M a écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Dear all,</div>
<div><br>
</div>
<div>using the mesh2d - function I get an
error: mesh2di: some points are
identical.</div>
<div><br>
</div>
<div><br>
</div>
<div>How to identify these points and remove
the duplicates?</div>
<div><br>
</div>
<div>There are roughly 500'000 coordinates....</div>
<div><br>
</div>
<div>Thank you,</div>
<div>Philipp<br>
</div>
</div>
<br>
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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
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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
<a href="https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/www.utc.fr/~mottelet" target="_blank">http://www.utc.fr/~mottelet</a>
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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
<a href="http://www.utc.fr/~mottelet" target="_blank">http://www.utc.fr/~mottelet</a>
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