Merge branch 'master' into update-bootstrap-jquery-GF

.github/workflows/jekyll-pages.yml

@@ -25,7 +25,7 @@ jobs:
       github.event.workflow_run.conclusion == 'success'
     steps:
       - name: 'Download artifact github pages'
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         id: artifactgh-pages
         with:
           script: |
@@ -62,7 +62,7 @@ jobs:
       github.event.workflow_run.conclusion == 'success'
     steps: 
         - name: get PR number
-          uses: actions/github-script@v6
+          uses: actions/github-script@v7
           with:
             script: |
               var artifacts = await github.rest.actions.listWorkflowRunArtifacts({
@@ -88,7 +88,7 @@ jobs:
             unzip pr_number.zip
             echo "number=$(cat pr_number.txt)" >> $GITHUB_OUTPUT
         - name: Post address
-          uses: actions/github-script@v6
+          uses: actions/github-script@v7
           if: ${{ success()}}
           with:
            github-token: ${{ secrets.GITHUB_TOKEN }}
@@ -100,7 +100,7 @@ jobs:
               issue_number: ${{steps.prnumber.outputs.number}}
             });
         - name: Post error
-          uses: actions/github-script@v6
+          uses: actions/github-script@v7
           if: ${{ failure()}}
           with:
            github-token: ${{ secrets.GITHUB_TOKEN }}

FAQ.html

@@ -173,13 +173,13 @@
   <LI> <A NAME="debian_packages"></A>
        <B>Are there packages for Debian / Ubuntu available?</B>
        <P>Packages for Debian unstable (sid) are available from the official
-       Debian repository. Debian stable (bullseye) and Debian testing (bookworm)
+       Debian repository. Debian stable (bookworm) and Debian testing (trixie)
        might not contain the latest version of CGAL. In that case, add</P>
-      <PRE>   deb <A href="http://debian.cgal.org/">http://debian.cgal.org</A> bullseye main
-   deb-src <A href="http://debian.cgal.org/">http://debian.cgal.org</A> bullseye main</PRE>
-       or
       <PRE>   deb <A href="http://debian.cgal.org/">http://debian.cgal.org</A> bookworm main
    deb-src <A href="http://debian.cgal.org/">http://debian.cgal.org</A> bookworm main</PRE>
+       or
+      <PRE>   deb <A href="http://debian.cgal.org/">http://debian.cgal.org</A> trixie main
+   deb-src <A href="http://debian.cgal.org/">http://debian.cgal.org</A> trixie main</PRE>
        to <TT>/etc/apt/sources.list</TT> (note that you only need the pair of lines
        corresponding to the release you are using) and make sure that the package
        <TT>apt-transport-https</TT> is installed. The packages are called

_posts/2023-11-20-curvature_and_remeshing.md

@@ -0,0 +1,86 @@
+---
+layout: post
+title: "New in CGAL: Interpolated Corrected Curvature Measures and Isotropic Remeshing with Sizing Field"
+description: ""
+category:
+tags: [""]
+---
+{% include JB/setup %}
+
+<p>
+The CGAL project has been participating in 12 editions of the <a href="https://summerofcode.withgoogle.com/">Google Summer of Code</a>
+internship program. It is a great opportunity to welcome new members to our community, both contributors and mentors.
+This post introduces two contributions that have been incorporated into the CGAL library.
+
+First, <em>Interpolated Corrected Curvature Measures</em> from GSoC'22, by <a href="https://www.linkedin.com/in/hossam-saeed-1abab91b3/">Hossam Mohamed Seed</a>
+mentored by <a href="https://perso.liris.cnrs.fr/david.coeurjolly/">David Coeurjolly</a>,
+<a href="https://jacquesolivierlachaud.github.io/">Jacques-Olivier Lachaud</a>, and <a href="https://geometryfactory.com/who-we-are/">Sébastien Loriot</a>.
+
+Second,  <em>Isotropic Remeshing with Sizing Field</em> from GSoC'23  by <a href="https://3d.bk.tudelft.nl/ipaden/">Ivan Pađen</a> mentored by
+<a href="https://geometryfactory.com/who-we-are/">Jane Tournois</a> and <a href="https://geometryfactory.com/who-we-are/">Sébastien Loriot</a>.
+
+We present them together, as the second one relies on the first.
+
+<br>
+<h3>Interpolated Corrected Curvature Measures</h3>
+Based on the article <a href="https://doi.org/10.1111/cgf.14067"><i>Lachaud, J.-O., Romon, P., Thibert, B. and Coeurjolly, D. (2020), Interpolated corrected curvature measures for polygonal surfaces. Computer Graphics Forum, 39: 41-54</i></a>,
+the <em>Polygon Mesh Processing</em> package of CGAL now contains the function <code>interpolated_corrected_curvatures()</code>. This function
+can compute the Gaussian curvature, the mean curvature, and the principal curvatures and directions at every vertex (or a single one)
+of a surface mesh. An additional parameter, the ball radius, is provided so that the curvature estimation is summed over the neighborhood within
+a ball centered at each vertex (rather than using its 1-ring neighborhood) to accommodate for possible noise in the positions of vertices of
+the surface mesh.   Additionally,  if the polygonal mesh has a user-prescribed normal vector field, as opposed to only relying on the geometric information
+(e.g., post-processed normal vectors, normal vectors from normal maps), the corrected curvature measures can adapt accordingly.
+
+<br>
+<br>
+<div style="text-align:center;">
+  <a href="../../../../images/bimba_curvature.png"><img src="../../../../images/bimba_curvature.png" style="max-width:95%"/></a><br>
+  <br><small> Mean curvature, Gaussian curvature, Minimal principal curvature directions and Maximal principal curvature directions on a mesh.</small>
+</div>
+<br>
+<br>
+
+<h3>Isotropic Remeshing with Sizing Field</h3>
+
+Almost since the introduction of the <em>Polygon Mesh Processing</em> package in CGAL, the function <code>isotropic_remeshing()</code>
+has provided a way to isotropically and uniformly remesh a triangle mesh, given a target edge length. This implementation
+includes the preservation of (sharp) feature lines, as well as the possibility to only remesh a portion of the mesh.
+Extending this work, a concept of sizing field has been incorporated to the function, and a first model has been
+implemented following the article <a href="https://diglib.eg.org/handle/10.2312/conf.EG2013.short.029-032"><i>Dunyach, Marion, et al. "Adaptive remeshing for real-time mesh deformation." Eurographics 2013. The Eurographics Association, 2013.</i></a>
+and using the <em>Interpolated Corrected Curvature Measures</em> function for curvature computation.
+
+<br>
+<div style="text-align:center;">
+  <a href="../../../../images/david_comparison.png"><img src="../../../../images/david_comparison.png" style="max-width:95%"/></a><br>
+  <br><small>Input Mesh (left), Curvature based isotropic remeshing (right).</small>
+</div>
+
+<br>
+<br>
+<div style="text-align:center;">
+  <a href="../../../../images/thorvaldsen_comparison.png"><img src="../../../../images/thorvaldsen_comparison.png" style="max-width:95%"/></a><br>
+  <br><small>Input Mesh (left), Curvature based isotropic remeshing (right).</small>
+</div>
+<br>
+
+
+<h3>Status</h3>
+
+<p>All these additions already are integrated in CGAL's master branch on the
+<a href="https://github.com/CGAL/cgal/">CGAL GitHub repository</a>, and will be officially released
+in the upcoming version of CGAL, CGAL 6.0, scheduled for mid 2024.</p>
+
+<i class="glyphicon glyphicon-book"></i>
+<a href="https://doc.cgal.org/5.6/Manual/packages.html#PkgPolygonMeshProcessing">Documentation of the package Polygon Mesh Processing</a>
+<br>
+
+<i class="glyphicon glyphicon-book"></i>
+<a href="https://cgal.geometryfactory.com/CGAL/doc/master/Polygon_mesh_processing/index.html#title59">Documentation section of the master branch about <code>interpolated_corrected_curvatures()</code></a>
+<br>
+
+<i class="glyphicon glyphicon-book"></i>
+<a href="https://cgal.geometryfactory.com/CGAL/doc/master/Polygon_mesh_processing/index.html#title8">Documentation section of the master branch about <code>isotropic_remeshing()</code></a>
+<br>
+
+<i class="glyphicon glyphicon-download"></i>
+<a href="https://github.com/CGAL/cgal/tree/master">CGAL master branch on GitHub</a>

people.html

@@ -20,12 +20,12 @@ <h3>CGAL Editorial Board</h3>
 
 <style type="text/css">
 ul.list {
-	display:table;
+        display:table;
 }
 
 ul.list li {
-	float: left;
-	width: 20em;
+        float: left;
+        width: 20em;
 }
 </style>
 
@@ -62,6 +62,8 @@ <h3>Current Developers</h3>
         <BR>Universidade Federal de Pernambuco
    <LI> <A HREF="http://www-sop.inria.fr/members/Frederic.Cazals/">Fr&eacute;d&eacute;ric Cazals</A>
         <BR>INRIA Sophia Antipolis - M&eacute;diterran&eacute;e
+   <LI> <A HREF="https://www.geometryfactory.com/aboutus.html">Ange Clement</A>
+        <BR>GeometryFactory
    <LI> <A HREF="http://www.loria.fr/~odevil/">Olivier Devillers</A>
         <BR> INRIA Nancy - Grand Est
    <LI> <A HREF="http://people.inf.ethz.ch/gaertner/">Bernd G&auml;rtner</A> (former editor)