Fem: Add option to set data mode for SolverCalculiX

src/Mod/Fem/App/AppFemPy.cpp

@@ -252,14 +252,14 @@ private:
     Py::Object frdToVTK(const Py::Tuple& args)
     {
         char* filename = nullptr;
-
-        if (!PyArg_ParseTuple(args.ptr(), "et", "utf-8", &filename)) {
+        PyObject* binary = Py_True;
+        if (!PyArg_ParseTuple(args.ptr(), "et|O!", "utf-8", &filename, &PyBool_Type, &binary)) {
             throw Py::Exception();
         }
         std::string encodedName = std::string(filename);
         PyMem_Free(filename);
 
-        FemVTKTools::frdToVTK(encodedName.c_str());
+        FemVTKTools::frdToVTK(encodedName.c_str(), Base::asBoolean(binary));
 
         return Py::None();
     }

src/Mod/Fem/App/FemVTKTools.cpp

@@ -1711,7 +1711,7 @@ vtkSmartPointer<vtkMultiBlockDataSet> readFRD(std::ifstream& ifstr)
 
 }  // namespace FRDReader
 
-void FemVTKTools::frdToVTK(const char* filename)
+void FemVTKTools::frdToVTK(const char* filename, bool binary)
 {
     Base::FileInfo fi(filename);
 
@@ -1733,6 +1733,8 @@ void FemVTKTools::frdToVTK(const char* filename)
         std::string type = info->GetValue(0).c_str();
 
         auto writer = vtkSmartPointer<vtkXMLMultiBlockDataWriter>::New();
+        writer->SetDataMode(binary ? vtkXMLMultiBlockDataWriter::Binary
+                                   : vtkXMLMultiBlockDataWriter::Ascii);
 
         std::string blockFile =
             dir + "/" + fi.fileNamePure() + type + "." + writer->GetDefaultFileExtension();

src/Mod/Fem/App/FemVTKTools.h

@@ -72,7 +72,7 @@ public:
     // write FemResult (activeObject if res= NULL) to vtkUnstructuredGrid dataset file
     static void writeResult(const char* filename, const App::DocumentObject* res = nullptr);
 
-    static void frdToVTK(const char* filename);
+    static void frdToVTK(const char* filename, bool binary = true);
 };
 }  // namespace Fem
 

src/Mod/Fem/Gui/DlgSettingsFemCcx.ui

@@ -686,6 +686,33 @@ By uncheck this option, CalculiX command behave like SolverCalculiXCcxTools</str
           </property>
          </widget>
         </item>
+        <item row="11" column="0">
+         <widget class="QLabel" name="l_result_format">
+          <property name="text">
+           <string>Result format</string>
+          </property>
+         </widget>
+        </item>
+        <item row="11" column="2">
+         <widget class="Gui::PrefCheckBox" name="ckb_result_format">
+          <property name="toolTip">
+           <string>Save result in binary format.
+Only ta  kes effect if 'Pipeline only' is enabled</string>
+          </property>
+          <property name="text">
+           <string>Use binary format</string>
+          </property>
+          <property name="checked">
+           <bool>false</bool>
+          </property>
+          <property name="prefEntry" stdset="0">
+           <cstring>BinaryOutput</cstring>
+          </property>
+          <property name="prefPath" stdset="0">
+           <cstring>Mod/Fem/Ccx</cstring>
+          </property>
+         </widget>
+        </item>
        </layout>
       </item>
      </layout>

src/Mod/Fem/Gui/DlgSettingsFemCcxImp.cpp

@@ -73,6 +73,7 @@ void DlgSettingsFemCcxImp::saveSettings()
     ui->dsb_ccx_minimum_time_step->onSave();  // Minimum time step
     ui->dsb_ccx_maximum_time_step->onSave();  // Maximum time step
     ui->ckb_pipeline_result->onSave();
+    ui->ckb_result_format->onSave();
 
     ui->cb_analysis_type->onSave();
     ui->cb_BeamShellOutput->onSave();  // Beam shell output 3d or 2d
@@ -101,6 +102,7 @@ void DlgSettingsFemCcxImp::loadSettings()
     ui->dsb_ccx_minimum_time_step->onRestore();  // Minimum time step
     ui->dsb_ccx_maximum_time_step->onRestore();  // Maximum time step
     ui->ckb_pipeline_result->onRestore();
+    ui->ckb_result_format->onRestore();
 
     ui->cb_analysis_type->onRestore();
     ui->cb_BeamShellOutput->onRestore();  // Beam shell output 3d or 2d

src/Mod/Fem/femsolver/calculix/calculixtools.py

@@ -172,7 +172,8 @@ class CalculiXTools:
 
     def _load_ccxfrd_results(self):
         frd_result_prefix = os.path.join(self.obj.WorkingDirectory, self.input_deck)
-        Fem.frdToVTK(frd_result_prefix + ".frd")
+        binary_mode = self.fem_param.GetGroup("Ccx").GetBool("BinaryOutput", False)
+        Fem.frdToVTK(frd_result_prefix + ".frd", binary_mode)
         files = os.listdir(self.obj.WorkingDirectory)
         for f in files:
             if f.endswith(".vtm"):