FEM: Add NetGen Min Size (#12794)

src/Mod/Fem/App/FemMeshShapeNetgenObject.cpp

@@ -53,6 +53,7 @@ const char* FinenessEnums[] =
 FemMeshShapeNetgenObject::FemMeshShapeNetgenObject()
 {
     ADD_PROPERTY_TYPE(MaxSize, (1000), "MeshParams", Prop_None, "Maximum element size");
+    ADD_PROPERTY_TYPE(MinSize, (0), "MeshParams", Prop_None, "Minimum element size");
     ADD_PROPERTY_TYPE(SecondOrder, (true), "MeshParams", Prop_None, "Create quadric elements");
     ADD_PROPERTY_TYPE(Fineness, (2), "MeshParams", Prop_None, "Fineness level of the mesh");
     Fineness.setEnums(FinenessEnums);
@@ -95,6 +96,7 @@ App::DocumentObjectExecReturn* FemMeshShapeNetgenObject::execute()
     NETGENPlugin_Hypothesis* tet = new NETGENPlugin_Hypothesis(0, 1, newMesh.getGenerator());
 #endif
     tet->SetMaxSize(MaxSize.getValue());
+    tet->SetMinSize(MinSize.getValue());
     tet->SetSecondOrder(SecondOrder.getValue());
     tet->SetOptimize(Optimize.getValue());
     int iFineness = Fineness.getValue();

src/Mod/Fem/App/FemMeshShapeNetgenObject.h

@@ -39,6 +39,7 @@ public:
     ~FemMeshShapeNetgenObject() override;
 
     App::PropertyFloat MaxSize;
+    App::PropertyFloat MinSize;
     App::PropertyBool SecondOrder;
     App::PropertyEnumeration Fineness;
     App::PropertyFloat GrowthRate;

src/Mod/Fem/Gui/TaskTetParameter.cpp

@@ -49,6 +49,7 @@ TaskTetParameter::TaskTetParameter(Fem::FemMeshShapeNetgenObject* pcObject, QWid
     this->groupLayout()->addWidget(proxy);
 
     ui->doubleSpinBox_MaxSize->setValue(pcObject->MaxSize.getValue());
+    ui->doubleSpinBox_MinSize->setValue(pcObject->MinSize.getValue());
     ui->comboBox_Fineness->setCurrentIndex(pcObject->Fineness.getValue());
     ui->checkBox_SecondOrder->setChecked(pcObject->SecondOrder.getValue());
     ui->doubleSpinBox_GrowthRate->setValue(pcObject->GrowthRate.getValue());
@@ -60,6 +61,10 @@ TaskTetParameter::TaskTetParameter(Fem::FemMeshShapeNetgenObject* pcObject, QWid
                      qOverload<double>(&QDoubleSpinBox::valueChanged),
                      this,
                      &TaskTetParameter::maxSizeValueChanged);
+    QObject::connect(ui->doubleSpinBox_MinSize,
+                     qOverload<double>(&QDoubleSpinBox::valueChanged),
+                     this,
+                     &TaskTetParameter::minSizeValueChanged);
     QObject::connect(ui->comboBox_Fineness,
                      qOverload<int>(&QComboBox::activated),
                      this,
@@ -120,6 +125,12 @@ void TaskTetParameter::maxSizeValueChanged(double Value)
     touched = true;
 }
 
+void TaskTetParameter::minSizeValueChanged(double Value)
+{
+    pcObject->MinSize.setValue(Value);
+    touched = true;
+}
+
 void TaskTetParameter::setQuadric(int s)
 {
     pcObject->SecondOrder.setValue(s != 0);

src/Mod/Fem/Gui/TaskTetParameter.h

@@ -69,6 +69,7 @@ public:
 private Q_SLOTS:
     void SwitchMethod(int Value);
     void maxSizeValueChanged(double Value);
+    void minSizeValueChanged(double Value);
     void setQuadric(int s);
     void setGrowthRate(double v);
     void setSegsPerEdge(int v);

src/Mod/Fem/Gui/TaskTetParameter.ui

@@ -38,6 +38,24 @@
      </item>
     </layout>
    </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>Min. Size:</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QDoubleSpinBox" name="doubleSpinBox_MinSize">
+       <property name="maximum">
+        <double>9999999.990000000223517</double>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
    <item>
     <widget class="QCheckBox" name="checkBox_SecondOrder">
      <property name="text">