Merge branch 'fix_meshing_bug' into 'master'

Fix meshing bug (close surface on boundary)

See merge request ngsolve/netgen!508

libsrc/meshing/netrule3.cpp

@@ -77,6 +77,7 @@ void vnetrule :: SetFreeZoneTransformation (const Vector & allp, int tolclass)
   fzbox.SetPoint (transfreezone.Elem(1));
   for (i = 2; i <= freezone.Size(); i++)
     fzbox.AddPoint (transfreezone.Elem(i));
+  fzbox.IncreaseRel(1e-8);
   
   
   // MARK(setfz3);

rules/pyramidrules2.rls

@@ -163,6 +163,69 @@ freeset
 endrule
 
 
+rule "pyramid with one trig, left"
+
+quality 20
+
+mappoints
+(0, 0, 0);
+(1, 0, 0);
+(1, 1, 0);
+(0, 1, 0);
+(0.5, 0.5, -0.5);
+
+mapfaces
+(1, 2, 3, 4) del;
+(3, 2, 5) del;
+
+newpoints
+
+newfaces
+(1, 2, 5);
+(3, 4, 5);
+(4, 1, 5);
+
+elements
+(1, 2, 3, 4, 5);
+
+freezone2
+{ 1 P1 };
+{ 1 P2 };
+{ 1 P3 };
+{ 1 P4 };
+{ 1 P5 };
+{ 0.34 P1, 0.34 P2, 0.34 P5, -0.01 P3 };
+{ 0.34 P3, 0.34 P4, 0.34 P5, -0.02 P1 };
+{ 0.34 P1, 0.34 P4, 0.34 P5, -0.02 P2 };
+
+freezonelimit
+{ 1 P1 };
+{ 1 P2 };
+{ 1 P3 };
+{ 1 P4 };
+{ 1 P5 };
+{ 0.333 P1, 0.333 P2, 0.334 P5, 0 P3 };
+{ 0.333 P3, 0.333 P4, 0.334 P5, 0 P1 };
+{ 0.333 P1, 0.333 P4, 0.334 P5, 0 P2 };
+
+orientations
+(1, 2, 3, 5);
+(1, 3, 4, 5);
+
+
+freeset
+1 2 3 5;
+freeset
+1 3 4 5;
+freeset
+1 2 5 6;
+freeset
+3 4 5 7;
+freeset 
+1 4 5 8;
+endrule
+
+