Make VTK writing optional

src/one-body-sample.cc

@@ -376,7 +376,8 @@ int main(int argc, char *argv[]) {
 
       u4 += u4_diff;
 
-      { // Compute von Mises stress and write everything to a file
+      // Compute von Mises stress and write everything to a file
+      if (parset.get<bool>("writeVTK")) {
         auto const displacement =
             Dune::make_shared<BasisGridFunction<P1Basis, VectorType> const>(
                 p1Basis, u4);

src/one-body-sample.parset

@@ -6,6 +6,8 @@ printFrictionalBoundary = false
 printProgress = true
 printDifference = false
 
+writeVTK = false
+
 [grid]
 refinements = 3