From 9e065cdb7f254a664851c6dcb75ced8fa97d71ab Mon Sep 17 00:00:00 2001
From: marioalexis <mario.passaglia@gmail.com>
Date: Sat, 28 Feb 2026 07:20:12 -0300
Subject: [PATCH] Fem: Add command to clear mesh groups

---
 src/Mod/Fem/Gui/Resources/Fem.qrc             |   1 +
 .../Resources/icons/FEM_MeshClearGroups.svg   | 243 ++++++++++++++++++
 src/Mod/Fem/Gui/Workbench.cpp                 |   1 +
 src/Mod/Fem/femcommands/commands.py           |  24 ++
 4 files changed, 269 insertions(+)
 create mode 100644 src/Mod/Fem/Gui/Resources/icons/FEM_MeshClearGroups.svg

diff --git a/src/Mod/Fem/Gui/Resources/Fem.qrc b/src/Mod/Fem/Gui/Resources/Fem.qrc
index f08d0b2e4c..e8740d2017 100755
--- a/src/Mod/Fem/Gui/Resources/Fem.qrc
+++ b/src/Mod/Fem/Gui/Resources/Fem.qrc
@@ -60,6 +60,7 @@
         <file>icons/FEM_FEMMesh2Mesh.svg</file>
         <file>icons/FEM_MeshBoundaryLayer.svg</file>
         <file>icons/FEM_MeshClear.svg</file>
+        <file>icons/FEM_MeshClearGroups.svg</file>
         <file>icons/FEM_MeshDisplayInfo.svg</file>
         <file>icons/FEM_MeshGmshFromShape.svg</file>
         <file>icons/FEM_MeshGroup.svg</file>
diff --git a/src/Mod/Fem/Gui/Resources/icons/FEM_MeshClearGroups.svg b/src/Mod/Fem/Gui/Resources/icons/FEM_MeshClearGroups.svg
new file mode 100644
index 0000000000..b57de03b3d
--- /dev/null
+++ b/src/Mod/Fem/Gui/Resources/icons/FEM_MeshClearGroups.svg
@@ -0,0 +1,243 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="64px"
+   height="64px"
+   id="svg2860"
+   version="1.1"
+   sodipodi:docname="FEM_MeshClearGroups.svg"
+   inkscape:version="1.4 (e7c3feb100, 2024-10-09)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:dc="http://purl.org/dc/elements/1.1/">
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:zoom="5.5625784"
+     inkscape:cx="29.392844"
+     inkscape:cy="23.460343"
+     inkscape:window-width="1920"
+     inkscape:window-height="1040"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg2860" />
+  <defs
+     id="defs2862">
+    <linearGradient
+       gradientTransform="translate(0,-4)"
+       xlink:href="#linearGradient3767"
+       id="linearGradient3773"
+       x1="22.116516"
+       y1="55.717518"
+       x2="17.328547"
+       y2="21.31134"
+       gradientUnits="userSpaceOnUse" />
+    <linearGradient
+       id="linearGradient3767">
+      <stop
+         style="stop-color:#edd400;stop-opacity:1"
+         offset="0"
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+      <stop
+         style="stop-color:#fce94f;stop-opacity:1"
+         offset="1"
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+    <linearGradient
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+       xlink:href="#linearGradient3777"
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+       gradientUnits="userSpaceOnUse" />
+    <linearGradient
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+      <stop
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+    <linearGradient
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+    <linearGradient
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+       x1="145.72011"
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+       gradientUnits="userSpaceOnUse" />
+  </defs>
+  <metadata
+     id="metadata2865">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:creator>
+          <cc:Agent>
+            <dc:title>[bitacobir]</dc:title>
+          </cc:Agent>
+        </dc:creator>
+        <dc:date>2020-03-16</dc:date>
+        <dc:relation />
+        <dc:publisher>
+          <cc:Agent>
+            <dc:title>FreeCAD</dc:title>
+          </cc:Agent>
+        </dc:publisher>
+        <dc:identifier />
+        <dc:rights>
+          <cc:Agent>
+            <dc:title>FreeCAD LGPL2+</dc:title>
+          </cc:Agent>
+        </dc:rights>
+        <cc:license>https://www.gnu.org/copyleft/lesser.html</cc:license>
+        <dc:contributor>
+          <cc:Agent>
+            <dc:title />
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+        </dc:contributor>
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+    </rdf:RDF>
+  </metadata>
+  <g
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+    <path
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diff --git a/src/Mod/Fem/Gui/Workbench.cpp b/src/Mod/Fem/Gui/Workbench.cpp
index 1a6045e86a..83b86afb38 100644
--- a/src/Mod/Fem/Gui/Workbench.cpp
+++ b/src/Mod/Fem/Gui/Workbench.cpp
@@ -89,6 +89,7 @@ void Workbench::setupContextMenu(const char* recipient, Gui::MenuItem* item) con
     StdWorkbench::setupContextMenu(recipient, item);
     *item << "Separator"
           << "FEM_MeshClear"
+          << "FEM_MeshClearGroups"
           << "FEM_MeshDisplayInfo";
 }
 
diff --git a/src/Mod/Fem/femcommands/commands.py b/src/Mod/Fem/femcommands/commands.py
index d337908cb5..be67490ee2 100644
--- a/src/Mod/Fem/femcommands/commands.py
+++ b/src/Mod/Fem/femcommands/commands.py
@@ -725,6 +725,29 @@ class _MeshClear(CommandManager):
         FreeCAD.ActiveDocument.recompute()
 
 
+class _MeshClearGroups(CommandManager):
+    "The FEM_MeshClearGroups command definition"
+
+    def __init__(self):
+        super().__init__()
+        self.menutext = Qt.QT_TRANSLATE_NOOP("FEM_MeshClearGroups", "Clear Mesh Groups")
+        self.tooltip = Qt.QT_TRANSLATE_NOOP("FEM_MeshClearGroups", "Remove groups from FEM mesh")
+        self.is_active = "with_femmesh"
+
+    def Activated(self):
+        FreeCAD.ActiveDocument.openTransaction("ClearGroups FEM mesh")
+        FreeCADGui.addModule("Fem")
+        grps = "FreeCAD.ActiveDocument." + self.selobj.Name + ".FemMesh.Groups"
+        remove_func = "FreeCAD.ActiveDocument." + self.selobj.Name + ".FemMesh.removeGroup"
+        FreeCADGui.doCommand(f"tuple(map({remove_func}, {grps}))")
+        FreeCAD.Console.PrintMessage(
+            f"Groups cleared: Now {self.selobj.Name} has {self.selobj.FemMesh.GroupCount} groups\n"
+        )
+        FreeCAD.ActiveDocument.commitTransaction()
+        FreeCADGui.Selection.clearSelection()
+        FreeCAD.ActiveDocument.recompute()
+
+
 class _MeshDisplayInfo(CommandManager):
     "The FEM_MeshDisplayInfo command definition"
 
@@ -1233,6 +1256,7 @@ FreeCADGui.addCommand("FEM_MaterialSolid", _MaterialSolid())
 FreeCADGui.addCommand("FEM_FEMMesh2Mesh", _FEMMesh2Mesh())
 FreeCADGui.addCommand("FEM_MeshBoundaryLayer", _MeshBoundaryLayer())
 FreeCADGui.addCommand("FEM_MeshClear", _MeshClear())
+FreeCADGui.addCommand("FEM_MeshClearGroups", _MeshClearGroups())
 FreeCADGui.addCommand("FEM_MeshDisplayInfo", _MeshDisplayInfo())
 FreeCADGui.addCommand("FEM_MeshGmshFromShape", _MeshGmshFromShape())
 FreeCADGui.addCommand("FEM_MeshGroup", _MeshGroup())