Ignore the normalstress for non-frictional nodes

src/one-body-sample.org

@@ -316,10 +316,7 @@
       <<computeGravitationalBodyForce>>;
     }
     SingletonVectorType surfaceNormalStress(finestSize);
-    surfaceNormalStress = 0.0;
-    for (size_t i = 0; i < frictionalNodes.size(); ++i)
-      if (frictionalNodes[i][0])
-        surfaceNormalStress[i] = normalStress;
+    surfaceNormalStress = normalStress;
   
     MatrixType stiffnessMatrix;
     <<assembleStiffnessMatrix>>;